Communications Standards Review Telecommunications

COMMUNICATIONS STANDARDS REVIEW TELECOMMUNICATIONS

Volume 9, Number 6 August – September 1998

IN THIS ISSUE The following reports of recent standards meetings represent the view of the reporter and are not official, authorized minutes of the meetings. TIA TR-41.3 And CSA T-510, Analog And Digital Wireline Telephones, May 14, 1998, Norfolk, VA...... 2 TR-41.3 Meeting Roster, May 14, 1998, Norfolk, VA...... 4 Q11/16 Circuit-Switched Network (CSN) Multimedia Terminals and Systems Experts Meeting, June 8-11, 1998, Cannes, France...... 5 Systems...... 5 Mobile...... 6 Q11/16 Closing Session...... 7 Q11/16 Experts Meeting Roster, June 8-11, 1998, Cannes, France...... 8 ITU-T STUDY GROUP 8, Terminal Equipment for Telematic Services, June 9 – 18, 1998, Geneva, Switzerland...... 9 Decided SG8 Recommendations...... 10 Determined SG8 Recommendations...... 10 Question 1/8, Facsimile Terminals...... 10 Question 2/8, Facsimile Test Charts and test images...... 16 Question 3/8, Cooperative Document Handling (including Binary File Transfer)...... 17 Question 4/8, Document communication services...... 18 Question 5/8, Color for telematic applications...... 22 Question 6/8, Common Components for Image Communication...... 24 Question 7/8, Coded character sets and control functions for telematic and other ITU-T services...... 25 Study Group 8 Partial Meeting Roster, June 9 – 18, 1998, Geneva, Switzerland...... 26 ETSI TIPHON Meeting #8, Jun 16-19, 1998, Helsinki, Finland...... 27 Working Group 1, Requirements...... 28 Working Group 2, Architecture...... 30 Working Group 3, Call Control...... 32 Working Group 4, Naming, Addressing...... 32 Working Group 5, Quality of Service...... 33 Working Group 6, Verification...... 33 TIPHON #8 Meeting Roster, June 16 – 19, 1998, Helsinki, Finland...... 34 ETSI Analog Terminals and Access (ATA) Meeting, June 22 – 26, 1998, Stockholm, Sweden...... 36 ATA Meeting Roster, June 22 - 26, 1998, Stockholm, Sweden...... 41 ETSI TM6 Access Transmission Systems On Metallic Cables Meeting, June 22 – 26, 1998, Lulea, Sweden...... 42 Q3/16 T120 Rapporteurs Meeting, June 22 – 26, 1998, Colorado Springs, CO...... 48 Q3/16 Rapporteur Meeting Roster, June 22 – 26, 1998, Colorado Springs, CO...... 50 Q11/16 Circuit-Switched Network (CSN) Multimedia Terminals and Systems Experts Meeting,...... 52 Mobile...... 52 Joint Meetings Of Q11/16 and Q15/16...... 53 Q11/16 Work Plan...... 54 Q11/16 Experts Meeting Roster, July 21 – 23, 1998, Whistler, BC, Canada...... 54 ITU-T Q15/16 Video Coding Experts Group, July 21 – 24, 1998, Whistler, British Columbia, Canada...... 55 Deployment and Support of H.263 and H.263+...... 55 Joint Q15/16 and Q11/16 Meeting...... 56 Test Model, Software, Encoding Optimization...... 59 Proposals and Demonstrations For H.263++ & H.26L...... 60 Video Coding For Signing and Lip Reading...... 62 Workplan For H.263++...... 62 Workplan For H.26L...... 63 Continuing Ad Hoc Committees...... 63 Q15/16 Experts Meeting Roster, July 21 – 24, 1998, Whistler, BC, Canada...... 64 TR-30, Data Transmission Systems and Equipment, July 27 – 29, 1998, Quebec, PQ, Canada...... 65 TR-30.1, Modems...... 65 TR-30.2, Data Transmission...... 65 TR-30.3, Data Communications Equipment Evaluation and Network Interfaces...... 66 TR-30 Meeting Roster, July 27 – 29, 1998, Quebec, PQ, Canada...... 68 ITU-T Q23/16 PCM Modem Meeting, July 30 - 31, 1998, Quebec City, Canada...... 69 Q23/16 PCM Modem Meeting Roster, July 30 - 31, 1998, Quebec City, Canada...... 71 Q4/15 DCEs for Subscriber Access Systems Rapporteurs Meeting, August 3 – 7, 1998, Antwerp, Belgium...... 72 Q4/15 Meeting Roster, August 3 – 7, 1998, Antwerp, Belgium...... 79 Acronym Definitions...... 81 1998 Standards Committee Meeting Schedules as of August 26, 1998...... 83

August – September 1998 Vol. 9.6 Copyright © CSR 1998 1 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATION JOINT MEETING OF TIA TR-41.3 AND CSA T-510, ANALOG AND DIGITAL WIRELINE TELEPHONES, MAY 14, 1998, NORFOLK, VA Editor’s note: The other TR-41 subcommittee reports from the May meeting are in CSR-T Vol. 9 #5. S. Whitesell (Philips Consumer Communications) was elected the new Chair of TR-41.3. D. McKinnon (Thomson Consumer Electronics) is the TR-41.3 electronic documents coordinator; his FTP site, which requires a password, is up and running. P. Adornato (Nortel) recently became the Chair of the TIA User Premises Equipment Division. TR-41 (User Premises Telecommunications) requires a new name. IPR In response to the Intellectual Property Rights (IPR) question, T. Russell (Philips Broadband) indicated they hold Intellectual Property (IP) relevant to the Caller ID work in TR-41.3.1. CSA LIAISON D. Rittenhouse (Spectrum Sciences Institute) reported that the Steering Committee on Telecommunications (SCOT) recently returned to a balanced matrix for membership. The Canadian Standards Association (CSA) is developing a new standard for interconnection with carriers, but it has not indicated the direction of the TIA-579A (Telecommunications Telephone Terminal Equipment Transmission Requirements for Digital Wireline Telephones, SP-3724-1) revision of CSA T.531. ETSI LIAISON The objective of ETSI’s Analog Terminals and Access (ATA) committee is to harmonize the national standards for terminals. F. Howett (Nortel) reported that ATA/ETSI has been working on a new document for new short loop installation with radio links as well as an on-hook and off-hook Calling Line Identity (CLID) standard. Also, ongoing is work to define service descriptions for possible new features for ETS-300 778-1 and ETS-300 778-2, which present off-line and on-line CLID requirements for terminals. ATA is developing three additional standards: • TBR-37 sets voice access standards specifying terminal requirements that do not harm the network and allow interworking with the network, e.g., call setup and clearing, network addressing, etc. It is expected to be approved at the next meeting. • TBR-38 sets handset telephony standards for end-to-end interworking between two terminals, including harmonized loudness ratings and single, harmonized, complex impedance echo return loss (ERL). It is approved but not yet published. • TBR-21 is the access standard for non-voice access of fax and modems. It is approved but not yet published. F. Howett (Nortel) will try to set up a formal liaison between ATA and the TIA TR-41.3. Both TBR-37 and 38 are covered in TIA-470 (Telephone Terminal Equipment - Performance and Compatibility Requirements for Telephone Sets with Loop Signaling). FCC NPRM ON “DISABILITIES PROVISIONS” The FCC issued a Notice of Proposed Rule Making (NPRM) in April to implement Section 255 (the “disabilities provisions”) of the U.S. Telecommunications Act of 1996, based on the Access Board’s Guidelines (ref. FCC 98-55, WT Docket 96-198). The NPRM requires that 12 to 20 dB of receive volume control gain must be provided, if “readily achievable.” The Access Board requirements do not have to be adopted, but they should be thoughtfully considered. TR-41.3/98-05-008 (S. Roleson, Hewlett-Packard) summarizes the NPRM. S. Whitesell (Philips Consumer Communications) provided a definition of “if readily achievable.”

TR-41.3/98-05-009 (R. Magnuson, Siemens Business Communications) contains an evaluation of the same three manufacturers’ telephone models used as proof-of-achievable in the Access Board guidelines. None of the sets met all the requirements (nominal receive objective loudness rating [ROLR] and 20 dB gain). Stability was an issue for two of the sets. The conclusion drawn from this evaluation is that these three models should not be used to extend the mandatory volume control range to 20 dB or 25 dB. The original evaluation done for the Access Board was a simplified measurement of range of volume control, without consideration of any other parameters. R. Magnuson contacted Mr. Teder and Dr. Levitt and found out that the original tests for the Self Help for the Hard of Hearing (SHHH) were done in about a half a day without an artificial

2 Vol. 9.6 Copyright © CSR 1998 August – September 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS ear. Furthermore, a probe mike was used in a real ear. These consultants did not know that these results would be used by the Access Board. The 12 to 20 dB range deviates from TIA’s interpretation of the Section 68.317 which says at least 12 dB of gain must be provided, with reset to nominal if greater than 18 dB is provided. TR-41.3/98-05-007 is a letter from TIA and Multimedia Telecommunications Association (MMTA) to the Common Carrier Bureau of the FCC, concerning FCC negotiated rulemaking on Hearing Aid Compatibility (re: FCC 96-285, CC Docket No. 87-124). It details TIA’s interpretation of the receive volume control requirements. The FCC has not yet responded. The TIA-255 working group will be developing comments for this NPRM. Comments are due June 30, 1998 and reply comments are due August 14, 1998. To this end, S. Whitesell (Philips Consumer Communications) wrote TR-41.3/98-05-010, a strawman response, from TR-41.3 to the TIA-255 working group; TR-41.3/98-05-011 is an alternate response, which S. Whitesell will present to the TR-41 plenary. FCC COMPLAINT ON BELL TAP S. Whitesell, (Philips Consumer Communications) will ask D. Dulmage (KTL-Certelecom) for the living list and write a letter to T1E1.1 asking if the measurements, which are the subject of the FCC complaint, make up a known network signal; he plans to include the information that L. Bell (Wyle Laboratories) sends him on the signals recorded by Wyle Labs (100 Vp-p 1/2 Hz square wave). D. Rittenhouse (Spectrum Sciences Institute) is waiting for J. Bipes (Mobile Engineering) and L. Bell (Wyle Labs) to send copies of the measurement information regarding the FCC complaint of the bell tap. A reply has been received from TR-41.1 indicating that PBXs don’t generate any related signals. TIA-470-B P UBLICATION STATUS TIA-470-B, “Telecommunications - Telephone Terminal Equipment - Performance and Compatibility Requirements for Telephone Sets with Loop Signaling,” is in the ANSI approval process. R. Britt (Nortel) is working with B. Zidek-Conner (TIA) on the editing corrections of the final version. EIA/TIA-579-A L ETTER BALLOT STATUS PN-3724, “TR-41.3, Analog and Digital Wireline Telephones,” was inadvertently not changed to SP (Standards Project) last fall. Therefore, a second pink SP letter ballot was sent out. The comment period closes June 3, 1998. PN-4708 ENHANCED CALLING FEATURES Consensus was reached on Type II (off-hook) signaling and protocols for PN-4708, Enhanced Calling Features. Prototypes need to be built quickly to verify the operation. An interim meeting will be held in Dallas, June 29 - 30, with the goal of producing a document ready for committee ballot immediately thereafter. This would clear the way for an industry ballot following the August TR-41.3 meeting. TR-41.3.2 S TUTTER DIAL TONE DETECTOR TR-41.3.2 started a performance document for stutter dial tone detection at their first meeting. They worked with TR-41.9 on details for the FCC waiver. PROPOSED NEW PROJECT, TIA-470-C TIA-470-C was proposed as a revision of TIA 470-B, Telecommunications - Telephone Terminal Equipment - Performance and Compatibility Requirements for Telephone Sets with Loop Signaling; J. Freestone (Nortel) volunteered to be editor. It was generally agreed that the standard would harmonize with ETSI/TBR-37 and its scope expanded to include analog cordless telephones. S. Whitesell will fill out a Project Initiation Notification System (PINS) form before the next meeting. PROPOSAL FOR INCLUSION OF VOICE OVER INTERNET PROTOCOL R. Britt (Nortel) introduced the idea of expanding TIA-579-A beyond terminals with the lower bit rate, to include VoIP terminals and perhaps, voice over internet protocols. The proposal was met with mixed reactions, partly due to the fact that TIA-579-A is already in its final, committee letter ballot and is several months away from being published. This idea will be discussed at the joint meeting with TR-41.1 in August.

OTHER HIGHLIGHTS D. Rittenhouse returned to TIA his corrections of TIA-470-B, which included the change in value of the blocking capacitor in Figure 44 to 200 µf. D. Dulmage (KTL-Certelecom) will give him a copy of TIA-470-C, the living list, in electronic format for distribution to TR-41.3 committee members.

TR-41.3 MEETING ROSTER, MAY 14, 1998, NORFOLK, VA Steve Whitesell, Philips Consumer CommunicationsChair TR-41.3

AST Technology Labs J. Bress Bellcore John Balinski Bosch Telecom Joachim Pomy CCL Anh Wride GTE Telephone Operations Harry Van Zandt Industry Canada Henry Mar Nortel Pierre Adornato Nortel Roger Britt Nortel J. Freestone Nortel Fred Howett Philips Broadband Tom Russell Philips Consumer Communications Steve Whitesell Siemens Ron Magnuson Spectrum Sciences Institute Dennis Rittenhouse Stentor Resource Centre Efrain Guevara Thomson Consumer Electronics Don McKinnon Thomson Consumer Electronics Clint Pinkham Uniden America A. Baum Wyle Laboratories L. Bell

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4 Vol. 9.6 Copyright © CSR 1998 August – September 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS REPORT OF THE Q11/16 CIRCUIT-SWITCHED NETWORK (CSN) MULTIMEDIA TERMINALS AND SYSTEMS EXPERTS MEETING JUNE 8 – 11, 1998, CANNES, FRANCE

The Q11/16 rapporteur is T. Geary (Rockwell). The meeting report is Q11-F-19d3. Items discussed at this meeting include: • The additions of Supplementary Services to H.324 Annex D (via Implementor Guide) • Test model for use by Q11/16 and Q15/16 experts in the quest for more error robust video transmission for H.324M • Inclusion of MPEG-4 in H.324 and H.245 • Extensions to the H.324 Mobile multiplex for error robustness • Interoperability Test Plan for (H.324M) Mobile Terminals • Coordination for future H.324L terminals targeting IMT2000. Documents for this meeting, for other meetings, and other information pertinent to the activities of the CSN Experts Group can be found on the Q11 ftp site: ftp://standard.pictel.com/lbc-site Documents for this meeting are found in the Cannes.June98 subdirectory. SYSTEMS

H.324 SYSTEM, CONTROL AND MUX Q11-F-10, “Implementers Guide for H.324 terminals” (C. Quist, Editor, KPN Research), provides text and clarifications based on H.324 dated 3/96. It will be submitted for Determination at the September SG16 meeting. The implementers Guide was initially planned as Annex D. Q11-F-07, “Support of MPEG-4 in H.324” (T. Kawahara, NTT DoCoMo), requests the support of MPEG-4 video in H.324 terminals and asks for codepoints in H.245 (control) to support this. It was discussed in a breakout group to determine what part of MPEG-4 is meant to be included in H.324. Q11-F-07r1 was created based on results of discussion. The group was asked if the content of the draft text provided sufficient information for readers to success- fully make an implementation. It was generally felt to be so, with members noting they wished to make further reviews within their companies before final decision. There was concern raised about the potential IP and it was agreed to request clarification on this issue in liaison to MPEG4. Members asked for clarification as to what the exact benefit to the H.324 systems would be. It was stated that this would provide the ability to display multiple objects and manipulate them in a variable way by scaling, moving etc., (at the receiver). Additional benefits are the ability to do synthetic natural hybrid coding and 12 bit luminance coding. It was further noted there may be additional functionality as well. This new video codec enables, for example, the presentation of multiple objects in one display or the manipulation of these objects at the transmitter and receiver side. The group had a long and controversial discussion on this topic. Possible scenarios were shown during a demonstration by Toshiba, e.g., conference application with several participants that can be randomly arranged on display. The group accepted the spirit of the proposal but requested to wait until the September SG16 meeting to make a final decision. Q11-F-16r1 is the report of the MPEG4 Breakout Group (B. Aronson, Barry Aronson Consulting). The group brainstormed three additional ideas: • Use a code point in V.8 in conjunction with V.34 POTS interfaces to signal MPEG-4 video capability. • Add a codepoint to the D channel signaling to signal MPEG-4 video capability on ISDN interfaces. • Map the MPEG-4 flex mux to one of the ALs. The positive aspect of this approach is that only a codepoint for the flex mux would be needed in H.245, not the richer set needed for the MPEG-4 visual standard. Considerable technical work would have to be done to prove its viability.

No conclusions were reached. Concerns include: 1. Are the proposed codepoints (Q11-F-07r1) correct, efficient and through? 2. Are the proposed codepoints valid considering MPEG-4 version 2? 3. Can H.263 v2, possibly including some additions, support the same applications as MPEG-4 visual when MPEG-4 uses the H.245 codepoints proposed?

4. What has to be done to integrate MPEG-4 beyond the video? Would piecemeal integration of MPEG-4 components create problems? 5. Are there conflicts with other H.245 commands (e.g., miscellaneous commands)? Contributions and liaisons addressing these concerns were requested. Q11-F-17r1 is the liaison to MPEG4. It presents the addition of code points suggested in H.245v5 to support the MPEG-4 visual standard and requests comments addressing the first three concerns noted above. Q11-F-20 is a second liaison to MPEG4 with the following wording: “With the understanding that the work on MPEG4 is nearing completion and desiring to continue working in close coordination with the MPEG4 group, Q11/16 would appreciate any information regarding the future work directions of ISO/IEC JTC1 SC29 WG11 especially relating to terminal definition work. Following the upcoming ITU-T SG16 meeting in September 1998, Q11/16 will be happy to provide the plan for our ongoing work if that is felt desirable.” The liaisons were approved. H.320 SYSTEM, CONTROL AND MUX Q11-F-04, “H.263+ in H.320” (P. Luthi, Picture Tel), presents changes required to implement H.263+ in H.320 based on the plan in Q11-E-20 (S. Gupta, VTEL). The group was agreed about the necessity of the proposal. It is important not to treat H.263+ as a new video codec but as a new version of H.263. The need of new capability messages in H.242, H.230 for H.263+ is obvious but the C&I messages used by H.320/H.242 should preferably be the same as for previous versions of H.263. FUTURE SYSTEMS WORK It was noted that the group has not shown extensive interest in beginning the work for H.324L. The group agreed to respond to upcoming activities concerning H.324L. MOBILE Q11-F-18 is the report of the mobile work. It was approved with minor editorial changes. TEST MODEL SPECIFICATION OF MOBILE EXTENSIONS FOR H.324M Q11-F-06 (S. Wenger, TU Berlin; G. Côté, UBC) describes a simulation environment and interface specification for video transmission over H.324 mobile channels. Q11-F-14 was also presented. The video group Q15/16 is also working on error-robust video coding algorithms. Therefore they request a test model, which covers the transmission environment that is provided by H.223 and its Annexes. This request is stated in Q11-F-06 and Q11-F-14. The documents describe an input and output interface for two different models. The first model only simulates a plain forward channel. The second model represents a complete system with retransmission capabilities. Due to the huge amount of work, the group decided that they should only consider the simple model at the moment. Due to the lack of companies that support software, the group decided to ask UCLA (J. Villasenor) whether their test software can be used for such a purpose. Siemens (T. Stockhammer) and UBC/TU-Berlin (S. Wenger) committed to support the work. Information on the video reference software can be found at http://www.ee.ubc.ca/spng and http://www.kbs.cs.tu-berlin.de/payload. INTEROPERABILITY TEST GROUP FOR MOBILE EXTENSIONS OF H.324/M Q11-F-12, Interoperability Test Plan for Mobile (M. Luomi, Nokia), describes test targets, test arrangements, and a time schedule to carry out testing. It was revised during an ad hoc to define the procedure and the parameters of the tests (see Q15-F-12r1). The tests are grouped into several phases. During phase 1 the registered companies will exchange several H.324 bit streams for verification. This includes streams for level 0, 1 and 2 and different settings, e.g., length of sequence numbers or usage of optional features. Detailed specification can be found in the documents. The test group agreed that this phase 1 will be finished by the September SG16 meeting. Phase 2, the level setup procedure and the physical serial connection, will take place at the September SG16 meeting. All participating companies will send the bit streams and the comments directly to each other; no information about it will be provided outside that group. The members are reminded that such activity is proprietary in nature and participation implies agreement of confidentiality as relates to participants product development status and especially test and or simulation results. Please contact the ad hoc chairman M. Luomi ([email protected]) for further information.

REED-SOLOMON CODE SUPPORT IN H.223/ANNEX C H. Tanaka (Toshiba) presented an optional coding algorithm for error-protection in H.223 Annex C (level 3 error protection protocol of the mobile H.223 extension). This proposal was discussed during previous meetings; further enhanced information is provided in Q11-F-08, Simulation Results of Optional Functionality for H.223 Annex C, and Q11-F-09r1, Proposal of H.245 Codepoints for Optional H.223 Annex C (both from H. Tanaka, Toshiba). This proposal allows the optional use of RS-codes (Reed Solomon codes) instead of RCPC-codes (Rate Compatible Punctured Convolutional codes). The usage is signaled by new code points in H.245. The simulation results show good performance of RS-codes for wireless channels. The mobile group agreed that this new code shall be included in a new Annex D of H.223. The H.223M Editor will prepare a TD-document for submittal to the September SG16 meeting for Determination, and will submit the changes required to H.245 to Q14/16 for inclusion in H.245v5. SIMULATION RESULTS OF UNEQUAL ERROR PROTECTION Q11-F-13 presents the investigation of unequal error protection (UEP) of H.263 video over error-prone channels. The H.263 syntax elements were separated in several classes, due to their error-susceptibility, and transmitted with different channel coding rates by using RCPC-codes. On the one hand, the paper shows the error susceptibility of all syntax elements, e.g., TCOEFF for intra macro blocks shows the highest error-susceptibility. On the other hand, simulations state that if the channel conditions and the source coding rate are constant, an optimal point of joint source and channel bandwidth can be found that is equal for unequal and equal error protection. The group decided to send a liaison to Q15/16 to inform them about the ongoing work in Q11/16 and to ask for collaborative work in defining an optimum coding for source and multiplex/channel. Q11-F-11, Performance Evaluation of a Two Layer Approach for UEP Schemes (H. Tanaka, Toshiba) presents the simulation results of a serial-concatenated code of RS and RCPC-codes. This aspect is important if a part of a packet has a higher error-susceptibility than the second part. Further investigation will be done, if possible with Q15/16 experts. OTHER HIGHLIGHTS AND FUTURE WORK Q11-F-05 (G. Roth, Ericsson) presents a set of new error patterns at 65 kbit/s for W-CDMA systems such as in the UMTS standard. It will be used for the upcoming interoperability tests. The group was reminded of H.324L as potential future work. Q11-F-15 from the Rapporteur will serve as guidance for this work. Definitions for interworking of H.324M and other H.series terminals will be studied. Q11/16 CLOSING SESSION Q11/16 Recommendation Status is shown in Table 1. The following Ad Hoc committees were approved and will continue until the next meeting (See Q11-F-19d3 Appendix I for rosters and charters): Ad Hoc Committee Chair System M. Nasiri Mobile B. Wimmer H.245 (open) Non-Conversational Svcs C. Quist H.263+ in H.320 S. Gupta Interoperability Testing (Mobile terminals) M. Luomi It was suggested that Q11/16 should consider a method for phasing out the use H.261 video codecs in the CSN multimedia systems and terminals. In the closing session with Q12/16, Q13/16 and Q14/16, Q11/16 asked if there should be consideration for MIBs in H.324/H.324 Annex D terminals. Q14/16 offered to work with Q11/16 in this area, noting there should be a lot of commonality to the work already accomplished for H.320 terminals.

Recommendation Deter- Decision/ Comment mination Approval H.324 Annex F, Support for H.multilink 9/98 White submitted 5/8 H.226, H.multilink 9/98 White submitted 5/8 H.324 Annex D, Implementers Guide 9/98 H.223 Annex D, Optional Multiplexing Protocol 9/98 3/99 over Highly Error-prone Channels H.320 (Rev.), System, Control, Mux 9/98 3/99 H.221 (Rev.), Fromae Structure for a 64 to 1920 9/98 3/99 kbit/s channel... H.230 (Rev.), Frame Synchronous Control and 9/98 3/99 Indication Signals... H.242 (Rev.), System for Establishing Comm... 9/98 3/99 using Digital Channels to 2 Mbit/s

Table 1. Q11/16 Recommendation Status.

Q11/16 EXPERTS MEETING ROSTER, JUNE 8-11, 1998, C ANNES, FRANCE Tom Geary, Rockwell Q11/16 Rapporteur Host: France Telecom

Finland Nokia / Finland Marko Luomi [email protected] France France Télécom / France Jean-Pierre Blin [email protected] Germany Robert Bosh GmbH / Germany Peter Vogel [email protected] Germany Siemens A.G / Germany BernhardWimmer Bernhard.Wimmer@ Germany Tech. Univ. Munich Germany Thomas Stockhammer [email protected] Germany TELES AG/TU Berlin Stephen Wenger [email protected] Japan NTT DoCoMo / Japan Toshiro Kawahara [email protected] Japan Toshiba / Japan Shigenobu Minami [email protected] Japan Toshiba / Japan Hirokazu Tanaka hirokazu@ clab.toshiba.co.jp Netherlands KPN Research / Netherland Cor Quist [email protected] Norway Tandberg Telecom a.s. / Norway Tom-Ivar Johansen [email protected] Sweden Ericsson / Sweden Mickey Nasiri [email protected] Sweden Ericsson Radio Systems / Sweden Goran Bang [email protected] UK BT Lab / U.K. Mike Nilsson [email protected] UK Motorola, UK Timor Kadir [email protected] USA 8 x 8, Inc. / U.S.A. Barry Andrews [email protected] USA Barry Aronson Consulting / U.S.A Barry Aronson [email protected] USA Intel Corporation / SUN Vineet Kumar [email protected] USA Rockwell / U.S.A. Tom Geary [email protected]

8 Vol. 9.6 Copyright © CSR 1998 August – September 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS REPORT OF ITU-T STUDY GROUP 8, TERMINAL EQUIPMENT FOR TELEMATIC SERVICES, JUNE 9 – 18, 1998, GENEVA, SWITZERLAND Editor’s Note: SG8 has requested that their documents not be made available to anyone who is not an ITU member. ITU members can download SG8 documents at: ftp://username:[email protected]//u/tsg8/sg8/ GENERAL BUSINESS - STRUCTURE OF SG8 The work within Study Group 8 has been allocated to two Working Parties: Working Party T - Telecommunications and Working Party C - Common Components. The reports for the opening plenary meetings are contained in TD-2206 (WP T) and TD-1076 (WP C). Study Group 8 Chairman W. Staudinger (Deutsche Telekom) announced that in the interest of greater efficiency, the management of the Study Group had agreed to eliminate the working parties. A key reason is due to the elimination of two questions (Questions 8 [Communications protocol PCIs for terminal equipment] and 9 [User interfaces for terminal equipment and protocols] as confirmed by TD-0030 from the TSB), due to lack of rapporteurs or contributions. The remaining seven Questions and the assigned rapporteurs are listed in Table 1. Q7/16 does not have a permanent rapporteur, but is being kept open in order to maintain liaison on character set issues with ISO as needed. W. Staudinger noted that the focus of the SG8 is, at present, mostly in two areas: • The T.30 related facsimile issues (Q1/8) • Internet fax (Q4/8) Therefore it has been proposed that these two areas be treated in a project- (or product-) oriented way, and that the reports on all Questions be presented to the SG8 Plenary. It was confirmed at the final plenary that each Question will report directly to the SG8 plenary for the remainder of the Study Period. W. Staudinger also announced at the Study Group plenary that there would be some continuing coordination of Questions by the following individuals: • A. Pugh (MGCS, UK) will oversee Questions 1, 2 and 5. • A. Macchioni (PT, Italy) will oversee Questions 3 and 6. • H. Silbiger (Lucent, USA) will oversee Question 4. Various documents of general interest were considered at the initial Working Party and final plenary sessions. • TD-0031 (TSB) contains some useful information on accessing the ITU ftp site (password required) and its internal structure. H. Zhao, the SG8 Counselor, noted that documents should be submitted in both electronic and paper forms. • TD-0038 is a liaison from the TSAG. It encourages the use of focus groups, and supports the publishing of “Technical Reports” as non-normative supplements.

Question Title Rapporteur Affiliation Q1 Facsimile Terminals B. Revillet France (France Telecom) Q2 Facsimile Test Charts and Test Images D. Bodson USA (NCS) Q3 Cooperative Document Handling (including Binary H. D. Schulz Germany (DTAG) File Transfer) Q4 Document Communication Services H. Silbiger USA (Lucent Technologies) Q5 Color for Telematic Applications L. McIntyre USA (Xerox) Q6 Common Components for Image Communication I. Sebestyen Germany (Siemens) Q7 Coded Character Sets and Control Functions for I. Sebestyen (acting) Germany (Siemens) Telematic and Other ITU-T Services Table 1. The Seven Questions for SG8 and their Rapporteurs.

DECIDED SG8 RECOMMENDATIONS Table 2 summarizes the recommendations for which the approval “Decision” was made at this meeting. This information is summarized in TD-0049. Decision is the final step in approving a Recommendation. EDITORIAL AMENDMENTS REQUESTING CORRIGENDA The following Recommendations require corrections of defects: Rec. Reference Documents T.30 D.96 sections 2.2.3, 2.2.4, 2.2.5, 2.2.6, 2.2.8 T.4 D.96 sections 2.1.3 up to 2.1.8 T.503 D.95 sections 2.1.1, 2.1.2, 2.1.4, 2.1.5 T.563 D.95 sections 2.2.1 up to 2.2.5 DETERMINED SG8 RECOMMENDATIONS Various recommendations were “Determined” at the plenary; they are shown in Table 3. Determination is the first step in the two step approval process. After Determination, recommendations are considered stable, and may only be edited for technical completeness/ correctness or editorial matters. QUESTION 1/8, FACSIMILE TERMINALS The Q1/8 Rapporteur is B. Revillet (France Telecom), [email protected]. The meeting report is TD-2210r2. The Q1/8 action plan is TD-2198r1. The meeting agenda is TD-2155. TD-0028 contains the summaries for the recommendations which were up for Decision at this meeting. Existing recommendations under the responsibility of Q1/8 include: T.4, Standardization of Group 3 facsimile terminals for document transmission T.6, Facsimile coding schemes and coding control functions for Group 4 facsimile apparatus T.30, Procedures for document facsimile transmission in the general switched telephone network T.31, Asynchronous facsimile DCE control - Service class 1 T.32, Asynchronous facsimile DCE control - Service class 2 T.33, Facsimile Routing Utilizing the Subaddress T.36, Security capabilities for use with Group 3 facsimile terminals

Q Recommendation Documents Q4/8 F.185, Internet facsimile: Guidelines for the support of the TD-2159 communication of facsimile documents Q3/8 T.180, T.XAPI - Homogeneous access mechanism to communication COM 8-34, plus COM 8-51, services and TD-1071 Q3/8 T.192, Cooperative Document Handling: Complex Services COM 8-42 Q1/8 T.30 Amendment 3 (multiple selective polling clarification, change of COM 8-53 plus TD-2170 R1 status of a number of bits of table 2, timer T2...) (page 2 only) Q4/8 T.37, Procedures for the transfer of facsimile data store and forward on TD-2165 plus TD-2165cor the internet Q4/8 T.38, Procedures for real time Group 3 facsimile communication TD-2168/Rev1 between terminals using IP Networks Q3/8 T.434 Amendment 1, Binary file transfer format for the telematic COM 8-47, plus TD-1064r1 services Q2/8 T.24 Amendment 1 (Standardized Digitized Image Set) COM 8-46,. D.122, TD-2190 Q6/8 T.86, Information technology - Digital compression and coding of COM 8-44 continuous tone still images - Registration procedures for JPEG profile, APPn marker and SPIFF profile ID marker Q6/8 T.87, JPEG-LS (new generation lossless JPEG) COM 8-53 plus D.133 Q1/8 T.90, Amendment 3, Provide a cause value for G4 fallback to G3 COM 8-45 Table 2. Decided SG 8 Recommendations.

Q Recommendations Reference Documents

Q1/8 Recommendation T.30

Introduction of manual communication mode using V.34 TD-2189 Rev 1 modem Introduction of an indication for cellular access TD-2195 (amendment) TD-2196 (summary) Introduction of extended negotiation procedure COM 8-57; D.111; TD-2177 (amendments) TD-2214 (summary) Introduction of BFT negotiation, phase B D.112 (amendments) TD-2213 (summary) Introduction of Internet related features TD-2193 (amendment) TD-2194 (summary) Introduction of resolutions higher than 400*400 pels/25.4 TD-2175 Rev 1 mm Introduction of voice data transmission TD-2175 Rev 1 Maximum response time to half duplex signals TD-2197 Annex H (RSA security algorithm): inclusion of missing Sra TD-2142 (amendment) tag TD-2171 (summary) Annex F (polling): deletion of double description for V.8 and D.102 (amendment) V.34 TD-2171 (summary) V.21 duplex mode COM 8-R8 appendix 5 to annex 1 (amendment) TD-2217(summary) Indication of T.37 and T.38 capability COM 8-53, TD-2170 R1 (page 1) Revision of annex J (Mixed Raster Content) TD-2208 (amendment) TD-2216 (summary)

Q1/8 Recommendation T.4

Introduction of resolutions higher than 400*400 pels/25.4 TD-2175 Rev 1 mm Introduction of voice data transmission TD-2175 Rev 1 Revision of Annex H (Mixed Raster Content) TD-2207 (amendment) TD-2215 (summary) Q1/8 T.36, Over ride mode + minor modifications D.107, section 2 (amendment) TD-2171 (summary) Q3/8 T.434, Amendment 2, Binary file transfer format for the TD-1067, summary in TD-1070. telematic services Q4/8 T.38, Amendment to Annex B of Draft T.38, Call TD-2163, TD-2172 establishment procedures Q6/8 T.84, Amendment 1: ITU-T T.84 | ISO/IEC 10918-3/PDAM 1: TD-1068R1, Annex 1 “Information technology - Digital compression and coding of continuous-tone still images: Extensions, Amendment 1: Provisions to allow registration of new compression types and versions in the SPIFF header” Table 3. Determined SG 8 Recommendations. T.39, Application profiles for simultaneous voice and facsimile terminals T.90, Characteristics and protocols for terminals for telematic services in ISDN T.503, A document application profile for the interchange of Group 4 facsimile documents T.563, Terminal characteristics for Group 4 facsimile apparatus

LIAISONS TD-2147 is a liaison from SG15. They have questions about output levels specified in T.4 and also testing of echo canceller performance under facsimile transmission. A small ad hoc group was formed to compose a response. REVISIONS TO GROUP 3 AND GROUP 4 FAX RECOMMENDATIONS D.95 (seven Japanese manufacturers) contains proposed editorial corrections to the G4 Recommendations T.503 and T.563. TD-2160 is the report from the ad hoc group on the T.503 and T.563 defects. All changes proposed in D.95 were accepted, except for the section 2.1.3, which is not needed. A corrigendum is requested. D.96 (seven Japanese manufacturers) contains proposed editorial corrections to the G3 Recommendations. Proposed changes to T.4 include: 1) Replace use of “lines/25.4 mm” by “pels/25.4 mm”, and 2) Correct the last FCD frame number to be n-1 or m-1 in the various charts. Similar changes on the lines to pels are recommended for T.30. Various other corrections are proposed to the flow diagrams related to entry into V.34 operations. It was decided that ad hoc groups were needed to check the editorial proposals for Group 3. TD-2142 (E. Mevel, France) proposes to add three new tags (Sra tags) into the security registration mode. TD-2144 is a liaison from SG7 requesting that old references to ASN.1 be updated to refer to the new recommendations. PROPOSED AMENDMENTS TO T.30, T.90 AND V.17 COM 8-45 regards Fallback values for T.90. This amendment is needed for Group 4 to enable proper fallback to Group 3. The document also contains some references to Group 2 fax which need to be deleted. D.127 (H. Hertlein, Deutsche Telekom) proposes to add three additional T.90 cause values to those proposed in COM 8-45. The cause values in COM 8-45 were originally generated in ETSI documents, but it was noted that these additional values from D.127 do not seem to be in the ETSI documents. The proposal for additional values was not accepted at this time; the introduction of these bits is for further study. COM 8-53 is the white contribution on amendments to T.30 which were up for Decision. The initial feeling was that further work was required on these, but that these should be considered in the ad hoc group on T.30 editorial changes. D.102 (seven Japanese manufacturers) proposes editorial amendments related to T.30/Annex F on V.34 operations. D.106 (A. Pugh, UK) notes a typographical error to be corrected in Rec. V.17. The paper is being submitted for information to SG8; the actual change will be submitted to SG16 so that Rec. V.17 can be corrected. D.107 (A. Pugh, UK) proposes amendments to T.4, T.30 and T.36 to clarify the “override mode.” It also states that the UK opposes the removal of bits related to alternate cipher mechanisms in Table 2. The text for the “override” mode was accepted. The final details related to Table 2 were assigned for consideration within a T.4/T.30 ad hoc group. TD-2169R1 (H. Tamura, Japan, ad hoc group) is the report of the ad hoc meeting, which was agreed, except for paragraph 5 describing the internet fax bits. Paragraph 5 describes bits to be defined in Table 2/T.30 that are used with T.37 (Procedures for the transfer of facsimile data via store-and-forward on the Internet) and T.38 (Procedures for real time Group 3 facsimile communication between terminals using IP Networks). After some discussion, Paragraph 5 was not accepted for Decision, since objections were raised to the procedure which had been followed. As a result, the contents of Paragraph 5 were agreed for Determination at this meeting. With these changes TD-2170R1, Changes to COM 8- 53-E for Decision and Items for Determination in COM 8-53-E), was agreed. TD-2171 describes the items in T.30 and T.36 for Determination; it was accepted. TD-2197 (H. Hertlein, Germany) describes the addition of a maximum response time (1.5s) between binary coded signals and binary coded signals and high speed modulation. If a facsimile terminal sends the response to a command too late, it can happen that the response collides with the next try of the command. It provides a paragraph to add into section 5.4.2 of T.30. It was agreed for Determination.

NEW FEATURES: NEW RESOLUTIONS, DOUBLE SIDED PRINTING AND VOICE D.98 (seven Japanese manufacturers) proposes the addition of support for double sided (duplex) printing to T.30. D.99 (seven Japanese manufacturers) proposes the addition of a 600 x 600 resolution as a valid resolution within T.30. Some delegates proposed that some additional resolutions should be considered. It was agreed to establish an ad hoc group to consider the two documents. D.97 (seven Japanese manufacturers) proposes the addition of a voice file transfer mode with Group 3 fax. It suggests the addition of bits to DIS and the addition of a new mode. It is suggested that the default method should be 32K ADPCM (G.726) coding and that the bit should be added in T.30. It was pointed out there is probably a need for a header to indicate the length of the data. It was suggested that this proposal also be considered in the ad hoc group. The report of the ad hoc group is TD-2175R1. It was agreed to add support for higher resolutions (600 x 600 pels/ 25.4 mm and 1200 x 1200 pels/25.4 mm). It was also agreed to add support for a voice transfer mode within T.30. This mode can be realized using either the Basic Transfer Mode, using a new T.30 bit, or via T.434 Binary File Transfer, using the OID (Object Identifiers) for the 32K ADPCM format defined in G.726. Support for double sided printing is for further study. The amendments related to higher resolutions and voice were agreed for Determination. PRIVATE USE COM 8-56 is a proposal for a new Recommendation T.Privateuse. There was discussion on what the potential applications of this facility would be. Some examples were 1) Identification of non-standard modulations, so that these could be identified by networks which may need to filter such facilities, and 2) Support for private use in multiple vendor situations. The rapporteur requested further contributions. INTERNET RELATED FEATURES D.103 and D.104 (seven Japanese manufacturers) propose an internet exchange protocol and internet addressing scheme. D.115 (J. Rafferty, USA) analyzes the requirements for internet addressing and proposes a solution using extended negotiations. D.120 (H. Hertlein, Deutsche Telekom) proposes using email address and/or phone number for internet routing. An ad hoc group was formed to review these documents. The report of the ad hoc meeting is TD-2192, which was agreed. Elements from the three contributions were incorporated in a proposed amendment to T.30. Support is to be provided for numerous new T.30 signals which will hold address content. Addresses supported include email, Uniform Resource Locators (URLs) and E.164 telephone addresses. The corresponding amendments to T.30, contained in TD-2193R1, were agreed for Determination; TD-2194 is the summary of the addition of internet related features within T.30 for Determination. SECURITY TD-2145 (SG7) contains a request for updates to a table entitled “ITU-T Security Related Recommendations.” The response liaison from Q1/8 to SG7 is TD-2211, which provides information for the table for T.30, T.36, T.503 and T.563. EXTENDED NEGOTIATIONS D.108 (A. Pugh, UK) provides comments on the extended negotiations procedures, raising points that had been discussed at previous meetings. D.110 (J. Rafferty, USA) provides a rationale and applications overview for extended negotiations. COM 8-57 (USA) contains the current full text of a proposed draft Annex X on extended negotiations. D.111 (J. Rafferty, USA) contains related amendments to Recommendation T.30. D.128 (seven Japanese manufacturers) contains refinements to draft Annex X. An ad hoc group was formed to review the documents. The report of the ad hoc meeting is TD-2178R1 (J. Rafferty, ad hoc group); it was accepted after a minor revision to the last paragraph. D.111 and COM 8-57 were accepted as the base documents, as amended by TD-2177, Agreed Revisions to Extended Negotiations Documents. The summary for addition of extended negotiations into T.30 is TD-2214. The documents were agreed for Determination. DUPLEX V.21 D.109 (A. Pugh, UK) provides additional information on the proposed use of V.21 duplex negotiation. It was noted that the current base text for the T.30 amendment proposal is contained in COM 8-R8-Appendix 5 to Annex 1.

There was discussion on whether V.21 duplex should be Determined. It was ultimately agreed that Determination would proceed. TD-2217 is the summary of the new annex to T.30 using V.21 Full Duplex. MOBILE FAX D.118, Test Campaign on G3 Facsimile Communication over Mobile Networks (A. Macchioni, Italy), reports on results of mobile fax testing. It reviews test results related to ECM (Error Correction Mode). It claims that ECM does not work well in situations with poor radio network quality. Several members questioned the conclusions and whether they took into account possible issues such as the ability to use ECM with a smaller frame size. The test results are based on using ETS 300 242, so they probably do not use the smaller ECM frame size. It was proposed that an ad hoc group be developed to 1) Study the issue of fax over mobile radio and summarize results of an informative nature, and 2) Study the possibility of amendments to recommendations to increase quality of communications over mobile networks. The result of the ad hoc group is TD-2201; there will be further study on this issue. TD-2154 is a liaison from an ITU-R Quality of Service ad hoc group. They are studying mobile multimedia services, but the support for fax is not directly stated. D.121, GSTN Access Category in DIS/DTC/ DCS (H. Hertlein, Germany), proposes the addition of a bit to T.30 for support of fax over cellular. The bit is intended to support the cellular connection in the same manner as the V.8 codepoint related to this matter. It is similar to other documents which have been submitted to previous meetings. A small ad hoc group was established to clarify the points in this document. The report from the ad hoc group is TD-2195, which also includes a proposed amendment to T.30. It was agreed that a DIS/DCS bit should be added to indicate a cellular connection. The report was accepted and the amendment accepted for Determination. TD-2196 is the summary of the amendment. QUALITY OF FACSIMILE COMMUNICATIONS TD-2151 is liaison from Study Group 2 on continued cooperation between Q5/2 and Q1/8. Q5/2 works on matters of quality of service related to support for fax over various networks. SG2 attached a current draft Recommendation E.hispeed to TD-2151 (from COM 2-R 39). This recommendation deals with V.34 fax operations and attempts to establish various metrics related to these operations. An ad hoc group was established to draft a reply. The result, TD-2199, provides minor comments on E.hispeed. It was agreed. V.34 AND V.8 Several documents deal with aspects of V.34 fax manual operation. Q1/8 had previously sent liaisons to Q4/16 and Q7/11 to see if there would be any problems with using a mode of V.34 operation which was somewhat different than in the automated case. TD-2149 is the resulting liaison from SG16. SG16 does not believe that revisions to V.34 or V.8 are advisable, but they have no objection to SG8 using its own method for defining the call and answer for the manual operation case and defining this within T series recommendations. TD-2153, a liaison from SG11, notes that they see no problems in SS#5 facilities (however, requires guard tone use) with the handling of manual V.34 operations as proposed in SG8. D.94 (Japanese manufacturers) offers a proposed draft amendment to recommendation T.30 to introduce a manual communication mode using V.34 modems. It uses a specific method of defining which modems are designated as the call and answer modems. The fax terminal which sends is the call terminal and uses the call modem procedures of V.8 and V.34. It was proposed that D.94 be Determined at this meeting. The TD-2149 liaison from SG16 covers two items: 1) Comments on V.34 manual operation (as discussed above), and 2) A proposed Fast Start-up mode of V.8bis. G. Griffith (Rockwell, USA) noted that the enhancement to V.8bis on a fast start-up mode that had been Determined and which is referenced in this document has since been opposed by the related rapporteur group. The reasons were due to compatibility concerns with existing modems. The Study Group has not yet met to take any official action on this approach, so that this situation is not reflected in the liaison. An ad hoc group met to finalize the approach on V.34 manual communication based on the liaisons and the contributions. The resulting proposed amendment and related summary is contained in TD-2189R1. It was agreed for Determination. TD-2148, a liaison from SG15, discusses issues related to demod/remod and manual communication in V.34 fax. Item 2 deals with the V.34 manual operation proposal. The liaison confirms that the ANSam signal will properly disable echo suppressors, cancellers and DCME regardless of which terminal submits the signal.

D.113 is a proposal to send a liaison to SG16 requesting control for a range of codepoints that could be used for support of fax applications in V.8. The proposal was accepted and an ad hoc group was formed to prepare the liaison. The resulting liaison, TD-2200, which requests a V.8 information category for the use of SG8, was agreed. BINARY FILE TRANSFER NEGOTIATIONS D.112 (J. Rafferty, USA) is a proposed T.30 amendment for the Phase B method of BFT negotiations (permits full negotiation of a proposed BFT, using OIDs, prior to entering Phase C). It re-introduces the technical amendments required to add support for this method into T.30. It was agreed for Determination in conjunction with the extended negotiations documents. The summary of this amendment is contained in TD-2213. MULTI-FUNCTION PERIPHERAL INTERFACE D.126 (H. Hertlein, Deutsche Telekom) notes the need for a Multi-Function Peripheral interface. There had been work on such an interface two years ago, but that no contributions have been received since this time. Although there may be some industry interest in this, there have still been no contributions. It is believed by some delegates that there is a more up-to-date list of requirements. Contributions are invited on the requirements and on the interface itself. JOINT Q1/8 - Q5/8 WORK ON MIXED RASTER CONTENT There was a joint meeting of Q1/8 and Q5/8 on the Mixed Raster content documents. The following documents (all from L. McIntyre, Xerox, USA) describe the changes to Annex J/T.30 and Annex H/T.4 required to accommodate T.44 (MRC). The Q5/8 rapporteur, L. McIntyre (Xerox, USA) explained that Q5/8 wants to apply these changes prior to the publication of these annexes: D.141, Proposed Changes to Rec. T.30 Annex J D.142, Rec. T.30 Annex J Mark-Ups Reflecting Proposed Changes D.145, Proposed Changes to Rec. T.4 Annex H D.146, Rec. T.4 Annex H Mark-Ups Reflecting Proposed Changes D.147, Rec. T.4 Annex H Mark-Ups to Accommodate Draft Annex A to T.44 D.148, , Rec. T.30 Annex J Mark-Ups to Accommodate Draft Annex A to T.44 TD-2180, Revised Rec. T.4 Annex H to be Applied Prior to Publication TD-2181, Revised Rec. T.30 Annex J to be Applied Prior to Publication TD-2182, Proposed Revised Rec. T.4 Annex H to Accommodate Draft Annex A to T.44 TD-2183, Proposed Revised Rec. T.30 Annex J to Accommodate Draft Annex A to T.44 The main reason for the revisions in TD-2180 is to take into account the more recent assignment of the actual marker segments assigned by AFNOR, the registration body for JPEG marker segments. AFNOR has only just recently made these assignments. In discussion, it was suggested that the changes appear to be substantive in nature. Later, H. Zhao (TSB) confirmed that the relevant amendments for T.4 Annex H and T.30/Annex J have already been published, so it is too late to make any changes. The Question 5/8 experts agreed to re-convene and decide on a course of action. These results and the related actions in the plenary are covered in the Question 5/8 meeting report, below. LIAISONS TD-2143 is a copy of the liaison to TSAG from SG7 indicating that SG7 denies the request of SG8 to transfer Recommendations X.5, X.38 and X.39 (fax pad) from SG7 to SG8 as the lead facsimile SG. It notes that the lead SG is a coordination role. No action was taken, since the TSAG has already ruled that the control of these recommendations will remain in SG7. TD-2185 is a liaison from SG15 about splitterless ADSL. This approach, called G.lite, does not use a band splitting filter. It is suggested that the technical details are more in the domain of SG16 than SG8. G. Griffith (Rockwell) noted that, to his knowledge, fax does not operate in the band above 4 kHz. H. Layec (France Telecom) noted that they are considering using the band below 4 kHz when the phone is on hook. TD-2209, a liaison in response, notes concerns with any use of the 0-4 kHz band. It was agreed. TD-2148 is a liaison on various issues from SG15. The item on G.766 DCME (Digital Circuit Multiplication Equipment) timing was reviewed. The liaison explains why DCME equipment can induce delay gaps which are slightly longer than in standard T.30 when signals are reconstructed by DCME equipment which executes demod- remod operations.

Q1/8 WORK PROGRAM The Q1/8 work program and milestones are shown in Table 4. An interim meeting is planned for Q1/8 during the first week of November, 1998 in the United Kingdom.

QUESTION 2/8, FACSIMILE TEST CHARTS AND TEST IMAGES The Question 2/8 Rapporteur is D. Bodson (NCS, USA), [email protected]. The meeting report is TD- 2191. TD-2158 is the meeting agenda. Although D. Bodson (USA) will be unable to continue in his role as the Rapporteur for Question 2/8, he will continue to act as the Editor of Recommendation T.24. Until the new Rapporteur is appointed, D. Bodson will continue to convene the meetings. No interim meetings are planned. Q2/8 objectives are to develop test charts and test images for the purposes of making objective comparisons between different types of coding schemes, and compare the quality of document reproduction for telematic terminals and systems. Existing Q2/8 Recommendations include: • T.22, Standardized test charts for document facsimile transmissions • T.23, Standardized color test chart for document facsimile transmissions • T.24, Standardized Digitized Image Set Rec. T.24 (Standardized Digitized Image Set), which was distributed in CD-ROM form, has been revised and is up for Decision at this meeting. TD-2190 (Rapporteur D. Bodson, USA) contains the amendment 1 text for Revised Rec. T.24. H Zhao (TSB) commented on TD-2190. He suggested that the word “Slerexe” be added to the document called “English Letter”, which is also called Document #1, due to the well known unofficial name of this document. H. Zhao noted that T.24 does not contain official test charts (these are in T.22), but are additional test images. COM 8-46 is the text of the proposed amendments to T.24 which were approved at the February 1998 meeting. D.122, Modifications to Proposed Extension to Rec. T.24, (D. Bodson, USA), proposes the addition of six images plus a table on B/W pixel counts. D.125 (H. Layec, France) suggests that a TIFF viewer be incorporated on the CD ROM and that a description of the Sun Raster format be provided in the Recommendation. It was agreed that the TIFF viewer be incorporated in the CD-ROM and a URL will also be provided for the Sun Raster format. The update to Rec. T.24 will be published not as an amendment, but as a full update to Rec. T.24. The draft recommendation will consist of COM 8-46, as modified by D.122 and TD-2190. Revised ITU-T Recommendation T.24 is scheduled to be completed in 2000.

Recommendation Reasons Determi- Decision nation Amendments to T.4 (Annex H) and Amendments of Mixed Raster Content coding scheme June 98 1999 T.30 (Annex J) Addition to T.30 Introduction of Extended negotiation procedure ; BFT June 98 1999 negotiation, phase B Amendments to T.30 (Annex F) Amendments for consistency with V.8 and V.34 June 98 1999 Amendments to T.30 (Annex H) Definition of Sra tag June 98 1999 Amendments to T.36 Clarification of over-ride mode June 98 1999 Amendments to T.4 and T.30 Introduction of resolutions > 400*400 pels/25.4 mm ; June 98 1999 introduction of voice file transfer Amendments to T.30 Introduction of Internet address and other June 98 1999 Amendments to T.4 and T.30 Introduction of double side printing 1999 Amendments to T.503 and T.563 References to X.680 series (and deletion of references to 1999 X.208 & X.209) Amendments to T.30 Maximum response time June 98 1999 Amendments to T.30 V.34 manual mode June 98 1999 Table 4. The Q1/8 work program and milestones.

QUESTION 3/8, COOPERATIVE DOCUMENT HANDLING (INCLUDING BINARY FILE TRANSFER) The Question 3 meeting was convened by Associate Rapporteur and Interim Rapporteur H.D. Schulz (DTAG, Germany), [email protected]. The two main activities under this question are Cooperative Document Handling and Binary File Transfer. The meeting report is TD-1075. The agenda is TD-1057. An interim meeting is scheduled for the first week of November 1998, to be held at the same location as Q1/8 and Q4/8 in the United Kingdom. LIAISONS FROM STUDY GROUP 7 TD-1055 is a liaison from SG7 requesting some edits to T.180 (T.XAPI) to remove certain references to phrases such as store and forward Multimedia mail, mail users and email interfaces. They suggest that X.446, common messaging call API could serve the needs of SG8 in this area. TD-0034 is a liaison from SG7 on Registration of Object IDs. SG7 has established a structure for registering Object IDs for joint ITU-ISO registration and ITU-T OID registration. Recommendations X.660, X.662, X.665 and X.666 define the procedures. TD-2144 is a liaison from SG7 which answers questions regarding the updates to ASN.1 as of 1997, including suggestions on changes which should be made to ASN.1 syntax. The original X.208 and X.209 ASN.1 Recommendations were revised and reissued as the X.680 - X.691 series (1997). Now there is a need to upgrade standards that use earlier versions of ASN.1 to the ASN.1 1997. BINARY FILE TRANSFER COM 8-47 is draft amendment 1 to T.434 (1996). It contains store and forward attributes and file retrieval documents. A working document (WD1) has some minor editorial fixes. The text of the base document COM 8-47 was reviewed in detail. Edits from WD1 and from comments in the meeting were added by the acting editor S. Maruyama (Japan). The updated document for Decision is COM 8-47, along with modifications noted in TD- 1064rev1. The version number in the ASN.1 syntax is 3, but the changes were small enough so that no change was made to the value of the “protocol-version.” D.112 (J. Rafferty, USA) contains a proposal for inclusion of a Phase B negotiations method within Recommendation T.30. It was presented for information. D.114 (J. Rafferty, USA) is a proposal to amend T.434 to add support for a MIME media type into T.434. D.114 was reviewed in detail; there was discussion on what would be needed to accomplish adding the new MIME media type field to T.434. The group believes this type of change requires a new protocol version, whereas the amendment for Decision at this meeting had retained the existing protocol version. The rapporteur proposed that J. Rafferty put the document into the proper form (deleting the tutorial information) as an amendment to T.434. Additional work will be done during the editing process to check the impact of the request from SG7 to eliminate the obsolete references and possibly update obsolete syntax. TD-1067, the resulting Amendment 2 for T.434, was submitted for Determination at this meeting. There is some additional work required on the ASN.1 syntax in order to make sure that the ASN.1 references and syntax are consistent with the 1997 version of the ASN.1 recommendations. It is noted that the version and protocol version will be updated. It was decided to update the BFT Implementor’s Guide (COM 8-41), according to the results listed above. This work should also include the information on ASN.1 Object Identifiers, contained in TD-0034. TD-1054 is a request from SG7 to update ASN.1 references and use in the draft Recommendation T.180. The group prepared TD-1073, a liaison to SG7, regarding the revisions to T.434 and the need for help on ASN.1 issues. T.180, HOMOGENEOUS ACCESS MECHANISM TO COMMUNICATION SERVICES T.180, the T.XAPI draft, had been up for Decision at the last meeting, but Decision had been deferred due to the need to consider further edits. The base documents for Decision at this meeting are COM 8-34, COM 8-51, and TD- 1071, Corrections to T.180 (H.D. Schulz, Germany, Associate Rapporteur). Annex C has been moved to Appendix I in this version.

COM 8-51 consists of a series of edits to COM 8-34 resulting from the discussions at the last SG8 meeting, at an audio conference with SG16, and taking into account the comments of SG7 (see TD-1054, TD-1055, and TD-1056). The most important change to COM 8-34 is that the former proposed Annex C became Appendix I. Some additional changes contained TD-1071 have been derived from a request in D.125 (Comments on 11 Recommendations submitted to SG8 for Approval, H. Layec, France) and the SG7 contributions to this meeting. One item, contained in TD-1054 (SG7 liaison to SG8 on T.XAPI), could not be considered at this time. SG7 requested that recommendations be updated to reference the X.68x series of ASN.1. However, It was felt that moving to the new numbers in the reference list could easily provoke inconsistencies, as all work has been carried out using the X.208 and X.209 ASN.1 documents. Moreover, the current references have been moved to the informative appendix. TD-1056, a liaison reply from SG7, contains the definition of a new multicast service and protocol (ECTF - Enhanced Communication and Transport Service). This approach could be adapted in a new Appendix for T.180. It was agreed that a liaison should be sent to SG7 to ask for their cooperation on this topic. The resulting liaison is TD-1074. T.192, COOPERATIVE DOCUMENT HANDLING: COMPLEX SERVICES - JOINT SYNCHRONOUS EDITING AND JOINT DOCUMENT PRESENTATION / VIEWING T.192, Cooperative Document Handling: Complex Services, as contained in COM 8-42, was Determined at the last SG8 meeting. It was agreed for Decision without modifications. D.125 (Comments on 11 Recommendations submitted to SG8 for Approval, H. Layec, France) requests that a liaison be sent to SG16 informing them about T.192. During the discussion, it was noted that close cooperation between Q3/8 and Q3/16 has been taking place. An interim meeting was held between both questions on the alignment of activities (Munich, September 1996). During this meeting, the profiling activity on T.120, contained in COM 8-42, was supported by Q3/16. A liaison, TD-1072, was prepared to inform SG16 about the finalization of T.192. T.191, COOPERATIVE DOCUMENT HANDLING The editorial corrections offered in D.124, Proposed Technical Corrigendum to Rec. T.191 (H. Etroukhin, Russia), were supported. D.124 shall be attached to the meeting report (TD-1075) so that these changes can be considered in the next revision of T.191 (CDH).

QUESTION 4/8, DOCUMENT COMMUNICATION SERVICES The Q4/8 rapporteur is H. Silbiger (USA, [email protected]). The meeting report is TD-2204r1. The meeting agenda is TD-2094. COM 8-54 is the report of the Tinton Falls, NJ Rapporteur’s Meeting, 12-16 January 1998. COM 8-55 is the report of the Q4/8 interim meeting. The Action Plan in TD-2205 was discussed. After the status of the documents was clarified, the action plan was approved. A revision will be issued. An interim meeting of Q4/8 is proposed for November 2-6, 1998 in the UK. The objectives of Q4/8 are the preparation of Recommendations which support document communications services such as the facsimile services. Existing Q4/8 Recommendations include: • F.160 (03/93) General operational provisions for the international public facsimile services. • F.162 (07/96) Service and operational requirements of store-and-forward facsimile service • F.163 (07/96) Operational requirements of the interconnection of facsimile store-and-forward units • F.166 (07/96) Service and operational requirements for a fax database service (FaxDB) • F.180 (03/93) General operational provisions for the international public facsimile service between subscribers’ stations (telefax) • F.182 (03/93) Operational provisions for the international public facsimile service between subscribers’ stations with group 3 facsimile machines (telefax 3) • F.182bis (10/96) Guidelines for the support of the communication of documents using group 3 facsimile between user terminals via public networks • F.184 (07/96) Operational provisions for the international public facsimile service between subscriber stations with group 4 facsimile terminals (telefax 4) • F.551 (1993) Service Recommendation for the telematic file transfer within telefax 3, telefax 4, teletex services and message handling services

• F.581 (1993) Guidelines for programming communication interfaces (PCIs) definition: Service Recommendation The base documents for the new draft Recommendations up for Decision going into this meeting were: F.185, Internet Facsimile: Guidelines for the support of the communication of facsimile documents (COM 8-48) T.37, Procedures for the transfer of facsimile data via store-and-forward on the Internet (COM 8-49) T.38, Procedures for real time Group 3 facsimile communication between terminals using IP Networks (COM 8-50) INTERNET FACSIMILE SERVICE ASPECTS COM 8-48 is the draft Rec. F.185, “Internet facsimile: Guidelines for the support of the communication of facsimile documents.” Recommendation F.185 describes the guidelines for the support of the communication of facsimile documents (both Group 3 and Group 4) via the Internet in real-time or store-and-forward mode. Support for Group 4 is for further Study. D.119 (H.D. Schulz, Deutsche Telekom) discusses support for Group 4 facsimile in the various internet fax recommendations. It is recommended that support of G4 (T.Ifax3) be for further study at this time. D.123 (N. Etroukhin, Russia) contains a request for a number of editorial clarifications on draft F.185. An ad hoc group chaired by A. Pugh (UK) reviewed the comments on draft Rec. F.185 and prepared the final version of the document for Decision (TD-2159). It was Decided by the SG8 Plenary. INTERNET FACSIMILE TECHNICAL ASPECTS: STORE AND FORWARD COM 8-58 (ISOC) contains the IETF proposed standard RFC 2301 on the File Format for Internet Fax. COM 8-59 (ISOC) contains RFC 2302, which provides the registration information for the image/TIFF MIME media type. It is an IETF standards track registration. COM 8-60 and COM 8-61 (ISOC) contain RFCs 2303 and 2304, respectively. RFC 2303 contains a general method for coding telephone addresses within e-mail addresses; RFC 2304 contains the coding of fax telephone addresses within e-mail address, based on a fax-specific use of the rules contained in RFC 2303. COM 8-62 (ISOC) contains RFC 2305, which defines the simple mode of facsimile using Internet Mail. COM 8- 63 (ISOC) contains the list of changes which were made to the January version of the simple mode document based on Q4/8 requests, resulting in the completed RFC 2305. COM 8-64 (ISOC) contains the text of RFC 2306, which is an informative RFC describing the F profile of TIFF. This document was provided since it is referenced in RFC 2305, although the formal technical definition of TIFF F is contained in RFC 2301. D.129, D.130, D.131 and D.132 (all from ISOC) are work in process within the IETF on topics related to developing an extended or full mode of Internet fax via e-mail. T.37, PROCEDURES FOR THE TRANSFER OF FACSIMILE DATA VIA STORE-AND-FORWARD ON THE INTERNET Draft Recommendation T.37 (T.Ifax1), “Procedures for the transfer of facsimile data via store-and-forward on the Internet,” describes the technical features necessary for the Store and Forward ‘Simple’ mode of operation of facsimile document transmission via Internet Mail. The general guidelines for the modes of operation of facsimile over the Internet are contained in draft Recommendation F.185. An ad hoc group chaired by A. Bimpson (UK) took on the responsibility of reviewing the comments on draft Rec. T.37 (TD-2165) and finalizing it for Decision. T.37 is basically a reference document (referencing IETF RFCs) supporting Simple Mode. Simple Mode supports the transfer of image data. Capabilities exchange and confirmation of receipt are not supported but may be provided by separate e-mail functions. The updated draft in TD- 2165 and TD-2165/Corr.1 was recommended to SG8 for Decision. TD-2212rev1 contains documentation required by Rec. A.5 in support of the IETF RFCs referenced within the draft T.37. T.37 FULL MODE TD-2187 is the report on the ad hoc meeting chaired by J. Rafferty (Internet Society) on T.37 Full Mode. Full Mode, which is identified as for further study in TD-2165, supports the transfer of image data with capabilities and confirmation. The group reviewed the requirements for T.37 full mode, and reached the following agreements:

• The target is to develop a stable draft of an amendment to T.37 which defines the full mode for Determination in April 1999. • The technical work in defining the full mode should proceed on a cooperative basis between Q4/8 and the IETF Internet fax working group. • A communication should be sent to the IETF with comments on the work in process related to the T.37 full mode. The draft communication is in TD-2188 and TD-2188cor2. • Contributions are invited for informative text on implementation matters for full mode that could be put into the form of a T.37 appendix or implementer’s guide. During the discussion it was felt that the timetable should be accelerated. It was agreed that, if an interim meeting could be held which was authorized to Determine a draft, Decision might be possible at the April 1999 SG8 meeting. The interim meeting is scheduled for the UK in the first week of November. The timing will be sufficient to permit the submission of documents to the TSB as white contributions. The meeting is agreed, although the exact timing is still to be determined. INTERNET FACSIMILE TECHNICAL ASPECTS: REAL TIME D.100 (seven Japanese manufacturers) contains comments on T.38 (T.ifax2). It discusses aspects of the text, and makes several points relating to the current instability of Annex B and the need to consider compatibility issues going forward. There is also a request for study on delay inside the Internet. D.116 (D. Mactaggart, Canada) summarizes the results of trials of real time facsimile over the public Internet. Trials were conducted using principles similar to T.38, but did not actually implement T.38 or H.323. The work was done in two passes; improvements resulted from reviewing the initial trial results. The trials were done using TCP/IP. The elongation of session time is consistently 5 seconds plus 5 seconds per page. D.135 (USA) is a proposal for the revised ASN.1 syntax for T.38 Annex A based on decisions made at the January 1998 Rapporteurs meeting (Tinton Falls, NJ). D.136 (USA) is a proposal for a revised Annex B (call establishment procedures) of draft T.38. It uses the fast setup method in H.323 version 2. This document recommends that the UDP method be the mandatory approach, with local generation of TCF, and that TCP/IP be optional. Voice plus fax is to be addressed in H.323 Annex D. TD-2150 is a liaison from Q13/16 (February, 1998) containing a proposed enhanced version of T.38 Draft Annex B. TD-2152 (D. Skran, Q13/16 Rapporteur) is a liaison which contains a draft of H.323 Annex D from the Q13/16 Rapporteur’s meeting in April. The liaison includes a modified version of T.38 Annex B. D.137 (D. Duehren, USA) is a proposed liaison to SG16 containing comments and proposed revisions to H.323 Annex D. D.138 (I. McCallum, USA) is a series of proposed amendments to draft Rec. T.38. They are intended to refine the current draft based on experience gained in prototype implementations. It includes an updated draft of the T.38 ASN.1 syntax reflecting the proposed changes. D.139 (I. McCallum, USA) contains a series of proposed enhancements to draft Rec. T.38 to improve efficiency. D.140 (H. Silbiger, USA) reviews the choice of the basic transport protocol for T.38. It proposes that UDP be the base mode, since many of the early implementations use UDP; it is felt that its use will be advantageous in voice/fax applications, since UDP is the protocol used for Voice over IP applications of H.323. T.38, PROCEDURES FOR REAL TIME GROUP 3 FACSIMILE COMMUNICATION BETWEEN TERMINALS USING IP NETWORKS Draft Recommendation T.38: “Procedures for Real Time Group 3 Facsimile Communication Between Terminals Using IP Networks,” describes the technical features necessary to transfer facsimile documents in real-time between two standard Group 3 facsimile terminals over the Internet or other networks using IP protocols. This Recommendation allows the use of either TCP or UDP depending on the service environment. The ad hoc group on T.38 chaired by D. Duehren (USA) produced: • TD-2161, Liaison to SG16 on Draft Annex D to H.323 • TD-2163, Revised Annex B of Draft Rec. T.38 • TD-2164, Summary of Agreed Upon Changes to T.38 Including Annex A (ASN.1 Syntax) • TD-2167, Report of Ad Hoc Group

• TD-2168, Draft Rec. T.38 The ad hoc reached the following agreements: • Both UDP (User Datagram Protocol) and TCP (Transmission Control Protocol) will be required for T.38 compliant implementations. Specific combinations in conjunction with Data Rate Management Methods will be supported, specifically TCP with Method 1 (local generation of TCF) and UDP with Method 2 (transfer of TCF). This agreement requires no change to the main text of T.38 but results in several modifications to Annex B. These changes are included in the revised draft Annex B in TD-2163. • The text proposed in D.139 section 2 (T.38 enhancements, I. McCallum, USA) supporting the transport of PIN (T.30 procedural interupt negative), PIP (T.30 procedural interupt positive) and CRP (T.30 command repeat) between gateways was accepted. At this point the method for achieving a switch to voice mode is a manufacturer-specific option. This issue is included in the liaison statement to SG16. • The suggested changes in D.135 related to the ASN.1 syntax were accepted. The addition of the HDLC-Sig-End Field Type as described in section 2.1 of D.138 (I. McCallum, USA) was accepted as was the change to remove the DISCONNECT packet type as described in Section 3 of D.139. • A modification to the ASN.1 description of the UDPTL Packet to reduce the implementation complexity was agreed. Discussion continued on the matter of UDP or TCP selection. TD-2164 summarizes the agreed changes to draft T.38, including Annex A. The changes are applied in TD-2168 Rev1, the text of T.38 for Decision. TD-2168Rev1 was discussed in the Q4/8 meeting. Some changes to the document were agreed. The Summary was changed to reflect that protocol selection is in the call control between gateways section of Annex B, which will not be included in T.38 for Decision. Section 7.2.1 should not have been deleted. Some needed editorial corrections will be supplied to the Rapporteur. The revised Summary is TD-2206. T.38 ANNEX B, CALL ESTABLISHMENT PROCEDURES T.38 Annex B describes the system level requirements for interoperability for internet-aware fax devices and internet- aware fax gateways conforming to T.38. Such systems interoperate on the call control plane with H.323 devices and with each other using the methods in Annex B. T.38 Annex B devices interoperate with H.323 Annex D fax devices using T.38 and the call setup methods of T.38 Annex B. However, a T.38 Annex B device does not conform to H.323, it is H.323 interoperable. TD-2163 contains the draft of Annex B to Rec. T.38. TD-2172 contains a correction to the text in TD-2163. The draft of Annex B with corrections in TD-2172 and the noted change was recommended for Determination at this meeting. TD-2161 contains a liaison statement to Study Group 16 in response to liaisons from Q13/16 in TD-2150 and TD- 2152. Since Q13/16 was meeting in Cannes concurrent with the SG8 meeting, it was sent by email with the status “not yet approved by SG8”. Unfortunately it was still received too late for consideration by Q13/16 in detail. Q13/16 did however send a liaison (TD-2166) during the week with some preliminary comments and observations on the choice of transport protocol. These concern the choice of UDP vs. TCP/IP as a transport protocol. Concerns were raised in the liaison about the use of UDP in the absence of a sensing mechanism to make better shared use of the IP network. OTHER INPUT DOCUMENTS D.101 (Y. Yoshiura, Japan) is a request for TSAG to work on guidelines for further collaboration between ITU-T and ISOC/IETF. It notes that Rec. A.5 is useful for the reference, but that they would like to see further formal processes be submitted. It proposes that a request be made to TSAG, via liaison, to create a rule of maintenance or common text. D.117 (G. Parsons, Canada) commends the cooperation between the ITU and ISOC/IETF and supports the approval of the T.37 document which references IETF RFCs. It also notes that there are relevant IETF Internet Drafts which may be helpful in realizing the “full mode” for Internet fax via e-mail. It proposes that SG8 designate a contact point for communications with ISOC/IETF and that SG8 document the results of its cooperation and forward them to TSAG for the development of formal guidelines for future cooperation.

An ad hoc group led by G. Parsons (Canada) reviewed D.101 and D.117. The output of the group is the liaison statement in TD-2186/Rev1 which reviews the SG8 experience in this matter. The last sentence of section 2 was replaced by: “ISOC/IETF and the ITU-T ultimately documented the email-based protocol in several standards track specifications (RFC 2301-2305) which Study Group 8 references in new Recommendation T.37.” It was agreed that issues regarding the specifics of the relationship were not in the province of SG8. The liaison was agreed. In the SG8 plenary, H. Zhao (TSB) requested that TD-2212rev1 (documentation required by Rec. A.5 in support of the IETF RFCs referenced within the draft T.37) and TD-2218 (the same for draft T.38) be included with the liaison to TSAG (TD-2186rev1) as attachments, with the addition of a sentence to clarify that SG8 has complied with the Rec. A.5 procedure. TD-2162 is a liaison from ITU-T SG13 on Fax Demodulation over ATM. It supersedes the earlier version, TD- 2157. The method used is demodulation/remodulation. A liaison in response was agreed (TD-2174). Q4/8 WORK PLAN The Q4/8 work program milestones are shown in Table 5.

QUESTION 5/8, COLOR FOR TELEMATIC APPLICATIONS The Q5/8 Rapporteur is L. McIntyre (Xerox, USA), [email protected]. TD-1065r2 is the meeting report. TD-1062 is the agenda. COM 8-43-E (L. McIntyre, Xerox) contains the report of the Q5/8 interim meeting in Tinton Falls held Jan 12-16, 1998. The Q5/8 objectives include: Development of representation and coding methods for color information to be transferred using Telematic applications. Models for the transfer of color information are also studied. The following points will be included: • Mixed color image reproduction including color image and black and white text contents within one page; • Development of other color modes to accommodate new ITU coding schemes; • Color parameters for soft-copy to soft-copy applications. The existing Q5/8 recommendations include: • Rec. T.42, Continuous tone color representation method for facsimile • Rec. T.43, Color and gray-scale image representations using lossless coding scheme for facsimile The main action items for the meeting were to progress work related to recommendations on a Mixed Raster Content mode for facsimile. T.44, MIXED RASTER CONTENT COM 8-43, the report of the Q5/8 interim meeting in Tinton Falls held Jan 12-16, 1998, also includes Draft T.44 Annex A, extension of T.44 to more than three layers, to be considered for Resolution 1 Determination. D.134Rev (M. Matsuki, NTT) provides comments to the Final Version of Rec. T.44. D.143 (L. McIntyre, Xerox) proposes changes to Rec. T.44; D.144 is the “mark up” reflecting these proposed revisions. TD-1061 (Rapporteur) is a summary of T.44 issues. During the meeting, it was noted that there has been a delay by the registration authority AFNOR in issuing JPEG marker assignments that are needed for the completion and final publication of T.44. At this meeting, the Q5/8 experts decided that only the requested mark Draft F.185 Internet facsimile: Guidelines for the support of the Decision June, 1998 communication of facsimile documents Draft T.37 Procedures for the transfer of facsimile data by store and Decision June, 1998 forward on the internet Draft T.38 Procedures for real time Group 3 facsimile communication Decision June, 1998 between terminals using IP Networks Amendments to T.38 Annex B Call establishment procedures for Rec. T.38 Decision Mar., 1999 Amendments to T.37 Full mode store and forward on the internet Decision Mar., 1999 Table 5. Q4/8 Work Program Milestones. ers would be needed. The TSB felt that this constituted a substantive technical change, thus requiring a new approval cycle.

It was agreed to suspend publication of Rec. T.44, and then revise Rec. T.44 to accommodate Application Marker (APP) changes and other edits. The changes to the main body of T.44 are contained in TD-1066 (Rec. T.44 to be published). TD-0046 (L. McIntyre, Q5/8 Rapporteur) contains a summary of APP marker code changes that have resulted in a need to revise T.44, Annex H / T.4 and Annex J / T.30. DRAFT ANNEX A / T.44 In Draft Annex A to Rec. T.44, it was agreed to extend MRC to more that three layers. It was ready for Resolution 1 Determination at this meeting (per COM 8-43). Two study items were identified for resolution prior to Resolution 1 Decision on Annex A / T.44: • Should there be restriction in size and/or offset of the overlay mask layers relative to the corresponding overlay image? If yes, then define the specific restriction. • Should SLC (start of layer coded data marker segment) be applied to all coders or restricted to coders that do not have their own marker segments? It was agreed that the new draft Annex A / T.44 should be integrated with the revised APP revisions to the main body of T.44 in order to create a single, integrated document for Resolution 1 Determination at this meeting. The resulting document, which is the new base text for T.44, is contained in TD-1080. The summary is contained in TD-1077. ASSOCIATED CHANGES TO T.4 AND T.30 In the joint meeting between Q1/8 and Q5/8 (see the Q1 report, above), H. Zhao (TSB) confirmed that the relevant amendments for T.4 Annex H and T.30/Annex J have already been published, so it is too late to make any changes. During the SG8 plenary, it was confirmed that a notice will be issued with the T.4 and T.30 amendments indicating that T.4 Annex H and T.30 Annex J are not valid in their current form and should be ignored. Q5/8 had requested that Q1/8 revise Rec. T.4 Annex H to accommodate the T.44 APP Marker changes as contained in TD-2180. This revision requires resubmission of Annex H / T.4 for Resolution 1 Determination at this meeting. The APP marker revision of Annex H / T.4 will be integrated with the proposed revisions in TD-2182, Proposed Revised Rec. T.4 Annex H to Accommodate Annex A/T.44, extension of MRC to more than three layers, thereby generating a single document. Q5/8 requested that Q1/8 submit the combined revision of Rec. T.4 Annex H as contained in TD-2207 for Resolution 1 Determination at this meeting. It was Determined. Q5/8 had requested Q1/8 to revise Rec. T.30 Annex J to accommodate the T.44 APP Marker changes. This revision, which was originally contained in TD-2181, will require resubmission of Annex J / T.30 for Resolution 1 Determination at this meeting. It was agreed that the APP marker revision of Annex J / T.30 will be integrated with the proposed revisions in TD-2183 to accommodate Annex A / T.44, extension of MRC to more than three layers, thereby generating one document. Q5/8 requested that Q1/8 submit the integrated revision of Annex J / T.30 as contained in TD-2208 for Resolution 1 Determination at this meeting. It was Determined. It is anticipated that the updated Annexes to T.4 and T.30 will ultimately supersede the versions which had been approved at the October, 1997 meeting. The summaries for the T.4 and T.30 proposed amendments are TD-2215 and TD-2216, respectively. During the plenary, the revisions to T.44, Annex J/T.30 and Annex H/T.4 were Determined. ISO FAST TRACK APPROVAL OF T.44 TD-1059 and 1060 (correspondence regarding ISO fast track adoption of Rec. T.44) include a request that ISO/JTC 1 publish Rec. T.44 as an ISO/JTC 1 standard. It was agreed to defer action on issuing such a letter until the revised T.44 is approved. LIAISONS AND COMMUNICATIONS Two liaisons have been issued to AFNOR: • TD-1079 notifies AFNOR that only one of the marker codes assigned will be used (APP13), so that the APP14 and APP15 marker segments can be assigned by AFNOR for other purposes. • TD-1078R1 is a follow-up to AFNOR to remind them that the assignment of APP markers needed by T.43 on the palette-color mode for facsimile is still pending.

Q5/8 WORK PROGRAM An interim Q5/8 meeting is scheduled in Japan during early October, 1998. The purpose of the meeting is to: • Decide the two draft Annex A / T.44 issues identified above. • Prepare white contributions for T.44, Annex H / T.4 and Annex J / T.30 Resolution 1 Decision in April 1999. • Study the extension of T.44 to accommodate the developing JBIG2 compression standard. Q5/8 work program and milestones: Extension of Recommendation for Mixed color and bi-level image 1999 Recommendation for JPEG LS color mode 2001 Recommendation for JBIG2 color mode 2000

QUESTION 6/8, COMMON COMPONENTS FOR IMAGE COMMUNICATION The Q6/8 Rapporteur is I. Sebestyen (Siemens, Germany), [email protected]. The Q6/8 meeting report is TD-1068r1. The Q6/8 agenda is TD-1063, the action plan TD-1069. No interim meetings are scheduled; however, there will be three JPEG/JBIG meetings: July 6-10, 1998 in Copenhagen; November 2-6, 1998 in Tucson, Arizona; and March 15-19, 1999 in Korea. The objectives of Q6/8 include: • Maintenance of existing set of T.80 series of Recommendations • Enhancements of existing set of T.80 series of Recommendations • Development of a “second generation” of Still Picture Coding schemes This question has been working in cooperation with ISO/IEC JTC1 SC29 on joint text for various image compression standards and related work. Existing Recommendations include: T.80, Common components for image compression and communication - Basic principles T.81, Information technology - digital compression and coding of continuous-tone still images T.82, Information technology - Coded representation of picture and audio information - progressive bi-level image compression T.83, Information technology - Digital compression and coding of continuous-tone still images: Compliance testing T.84, Information technology - Digital compression and coding of continuous-tone still images: Extensions T.85, Application profile for Recommendation T.82 - progressive bi-level image compression (JBIG coding scheme) for facsimile apparatus T.86, REGISTRATION PROCEDURES FOR JPEG PROFILE, APPN MARKER AND SPIFF PROFILE ID MARKER Draft Rec. T.86 (Information technology - Digital compression and coding of continuous tone still images - Registration procedures for JPEG profile, APPn marker and SPIFF profile ID marker) had been Determined at the February 1997 meeting of SG8. A summary for draft Rec. T.86 was drafted and approved (TD-1012). Since then, the approval process had to be stopped in May 1997, as ISO/IEC decided to go into a second DIS (Draft International Standard) voting cycle. COM 8-44 is the final version of this standard as it was approved by ISO/IEC JTC1 SC29. It was Decided at the SG8 plenary. T.87, JPEG-LS Draft Rec. T.87 (JPEG-LS: new generation lossless JPEG) was Determined at the October 1997 SG8 Meeting. COM 8-53 as amended with D.133 (both from the Editor) reflect the ISO/IEC JTC1 SC 29 final approved version of the standard. These documents were agreed without further changes by Q6/8. T.87 was Decided by the SG8 plenary. T.84 AMENDMENT, PROVISIONS TO ALLOW REGISTRATION OF NEW COMPRESSION TYPES AND VERSIONS IN THE SPIFF HEADER Amendment 1 of ITU-T T.84|ISO/IEC 10918-3 updates Rec. T.84 due to emergence of T.86 and T.87. It allows registration of new compression types and versions in the SPIFF (standard JPEG file format) header. This amendment is based on WD 1 “Combined PDAM Registration and PDAM Consideration Ballot on ISO/IEC 10918- 3/PDAM 1”. Its title is “Information technology - Digital compression and coding of continuous-tone still images: Extensions, Amendment 1: Provisions to allow registration of new compression types and versions in the SPIFF header.” The first registration process and balloting has started in ISO/IEC JTC1 SC29 already. It was agreed to

Determine Amendment 1 to T.84. The amendment is attached as Annex 1 to the meeting report (TD-1068R1, Annex 1). In a joint meeting with Q5/8 it was decided that the Q5/8 Rapporteur, L. McIntyre (Xerox), would participate in the July 6-10, 1998 meeting of SC29 WG1 in Copenhagen, and will deliver verbally liaison messages from Q5/8 and Q6/8 experts. No written liaison will be prepared. L. McIntyre will submit working document WD2 to the JBIG committee to raise the issue on whether the proposed technique “Compression of Static Black-and-White Images by the Method Forecasting” is within or beyond the scope of JBIG-2 standardization effort. The method deals more with “preprocessing” of b/w images than with the coding/decoding and interchange of images. Q6/8 WORK PROGRAM AND MILESTONES The Q6/8 items for future study in COM 8-1 are still relevant. In a joint meeting with Q5/8, a report was given about the new projects of JPEG/JBIG being pursued by the Collaborative Team. JBIG2 (“lossy/lossless JBIG”, whose official ISO/IEC title is ISO/IEC WD 14492 “Lossy/ Lossless coding of bi-level images”) is still of particular interest. It promises to improve compression for black/white images of various types. For example, for black and white fax pages without half-tones, the compression will typically be improved by a factor of 10 as compared to the current Modified Read. For dithered half-tone images, the compression will be about the same as currently offered by JBIG (T.82). It is currently still in the Working Draft phase within the JBIG-2 committee. In related news, it seems likely that there will be a “baseline” mode which is royalty free. IPR will be according to item 2.1 of the ITU patent policy (i.e., T.44 is under consideration as the “architectural model” for JBIG-2). JBIG-2 is targeted for standardization in 2000. The current JPEG-LS (Draft Rec. T.87, Information technology - Lossless and near-lossless compression of continuous-tone still images - baseline) is being extended. The first WD is expected in July 1998 with a likely ISO ballot starting in November 1998. Completion of the standard is expected in early 2000. ITU-T SG8 is expected to Determine JPEG-LS “Extensions” in April 1999; Decision is targeted for 2000. JPEG2000 is expected to be the next generation JPEG. Report was made on its progress. The interest in JPEG 2000 is substantial. More than 24 proposals were presented in Sydney and about 80-100 experts currently participate. Currently concentration of effort is on refining a wavelet-based algorithm of the University of Arizona. The work on JPEG2000 is currently carried out in several ad hoc groups. Many important decisions (e.g., architectural model, backwards compatibility to JPEG-1) are not settled yet. The requirements / application areas of JPEG2000 were attached to the Q6/8 meeting report (TD-1068r1) as Annex 2. Further input for improvement is solicited and should be addressed directly to the JPEG committee. Q6/8 has already provided feedback based on discussion at the last SG8 meeting. The rapporteur recommended that the application oriented questions of SG8 (e.g., Q1, Q4) should check to see the current stated facsimile requirements in the JPEG2000 requirements statement suffice to meet the need. An optimistic target for standardization is of JPEG2000 is the year 2000. The Q6/8 work program with milestones is shown in Table 6.

QUESTION 7/8, CODED CHARACTER SETS AND CONTROL FUNCTIONS FOR TELEMATIC AND OTHER ITU-T SERVICES Q7/8 did not meet. One liaison was received (TD-1058) from ISO/IEC JTC 1/SC2, for information (it was reviewed in the SG8 plenary). It noted that there is an ongoing revision of IS 6937, which is a coded graphic character set for text communication. It is being modified to: • Align the character names with those used IS 10646 • Address previously issued defect reports. James Rafferty, Human Communications Rec./Work Determination Decision T.86 1997-02 1998-06 T.87 = JPEG-LS 1997-10 1998-06 JPEG-LS “Extensions” 1999-03 2000 T.84 Am. 1 1998-06 1999-03 JPEG-Multicomponent 1999? 2000? JBIG2 1999 2000 JPEG2000 1999? 2000? Table 6. Q6/8 Work Program With Milestones.

STUDY GROUP 8 PARTIAL MEETING ROSTER, JUNE 9 – 18, 1998, GENEVA, SWITZERLAND Wilhelm Staudinger, Deutsche Telekom A.G.(Germany) SG8 Chair Alan Pugh, MGCS (UK) SG8 Vice Chair, WPT Andrea Macchioni, Ministero P.T. (Italy) SG8 Vice Chair, WPC Canada Don Mactaggart [email protected] Canada Glen Parsons [email protected] China Hai Lin China Xiuying Nie France Etienne Mevel France Gérard Boulay France Jérôme Cudelou France Philippe Charbonnier France France Telecom Herve Layec [email protected] France France Telecom/CNET Bernard Revillet bernard,[email protected] Germany Deutsche Telekom Harald K. Hertlein [email protected] Germany Deutsche Telekom Hans-Detlef Schulz [email protected] Germany Deutsche Telekom Manfred Schumann [email protected] Germany Siemens Istvan Sebestyen [email protected] India Rajvir Sharma Israel Elazar Ronen Italy Alberto Giuseppini Italy Alfio Giuffrida Italy Andrea Macchioni [email protected] Japan Hiroshi Endo Japan Hiroshi Tamura Japan Kenichi Shibata Japan Naoki Mori Japan Shigeru Maruyama Japan Taketoshi Nakahara Japan Toru Maeda Japan Yoichi Kudo Japan Yoshinori Aoki Japan Canon Yoshio Yoshiura [email protected] Japan Mitsubishi Electric Corp. Yoichi Tenda [email protected] Japan NTT Printec Co. Makoto Matsuki [email protected] Korea Oak Seungsoo Switzerland ITU Electronic Pubs Maynard Adea [email protected] Switzerland ITU Electronic Pubs Laszlo Mercz [email protected] Switzerland ITU/TSB H. Zhao [email protected] Ukraine Lyudmila Pakhaluk [email protected], [email protected] Ukraine Sergiy Polozov [email protected] United Kingdom Alan Bimpson United Kingdom MGCS Alan Pugh [email protected] USA David Crocker USA Frank Fruth USA Robert Marchese USA Brooktrout David Duehren [email protected] USA Consultant Dennis Bodson [email protected] USA Delta Information Sys Stephen Urban [email protected] USA Human Comm. James P. Rafferty [email protected] USA Lucent Herman R. Silbiger [email protected] USA NCS Stephen Perschau USA Rockwell Glen Griffith [email protected] USA Xerox Lloyd McIntyre [email protected] USA Xerox Vivian Cancio [email protected]

26 Vol. 9.6 Copyright © CSR 1998 August – September 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS REPORT OF ETSI TIPHON (TELECOMMUNICATIONS AND INTERNET PROTOCOL HARMONIZATION OVER NETWORKS) MEETING #8, JUNE 16 – 19, 1998, HELSINKI, FINLAND H. Schink (Siemens, TIPHON Chair) reminded all participants of ETSI’s Intellectual Property Rights (IPR) policy. There were no IPR announcements. Information about previously announced IPRs is available at http://www.etsi.fr/ipr/. L. Vreck (ETSI) was appointed as TIPHON’s interim Secretary, succeeding G. Meyer (Siemens). TD-20 (L. Ferrand, ETSI) is a list of ETSI TIPHON Deliverables. All actions resulting from TIPHON 7 meeting April 27-30 in Munich are completed. OCG/ETSI BOARD MEETING

The ETSI Special Committee Operational Coordination Group (OCG) meeting emphasized the importance of adhering to the ETSI rules and asked that all TIPHON documents be freely available. The ETSI board had decided to allow TIPHON committee documents to be made public on the ETSI server (as a pilot test). The Board is aware of the need for quality control of documents appearing on the server as well as prevention of unauthorized mirror sites. H. Schink asked L. Ferrand (ETSI) to make a procedural proposal to protect copyright when companies do not wish their documents publicly available. Infonova will close its mirror site as soon as ETSI has implemented its server policy. The ETSI Board accepted the new Terms of Reference supporting the merger of Multimedia Terminals and Applications (MTA) into TIPHON. SPECIALIST TASK FORCE (STF) REPORT Full time STF members include G. Kimchi (VocalTec, contact person), G. Korbler (Infonova/PTA), and R. Scholl (Siemens). TD-23 (G. Kimchi, VocalTec) reports on activities of STF 114 between TIPHON 7 and TIPHON 8, including the proposed Phase II work plan schedules, tasks, and missions. TD-23 includes the participation of STF 114 in the ITU-T Q12-14/16 rapporteurs meeting June 8-11; topics of discussion were inter-gatekeeper communications and functional decomposition of the gateway. Development of the Inter-Gatekeeping communication protocol could go in the following directions: • Extend Registration, Admission, and Status (RAS) as required (suggested by APC-1422) • Use DIAMETER (suggested by APC-1414) • Extend RAS now for basic capabilities and use DIAMETER later • Use another combination The Inter-Gatekeeping protocol solutions chosen must show how they satisfy the guidelines described in TD-14 (WG3 Report). In brief, these are: • Information Exchange at the administrative level • Proxy Authentication, Authorization, Registration, and Management by the gatekeeper • Accounting information exchange TD-25 (G. Kimchi, VocalTec) reports the STF-114 phase II activities at this TIPHON meeting: • TD-23, STF-114 TIPHON 7 – 8 Report and Phase II Work Plan • TD-65, ITU-T SG16 Q13 Meeting Report • TD-53, Q13 Gateway Functional Decomposition Document (Proposals for Functional Separation of H.323 Gateway) • TD-24, A possible Scenario 2 Solution presented to WG4 (Procedure for Resolving IP Addresses from E.164 Global Service Numbers) • TD-75r2, How H.323 can be extended to perform SS7 Mediation and Media Gateway Control TD-25 also lists Action Items from TIPHON 8, by priority, source, work-item, deadline and status. L. Vreck presented the GANTT chart of the TIPHON project plan. He expects significant progress in Phase 2 documents (actual protocol documents) in the next two meetings; he hopes that the Phase 2 milestone will be reached in Israel (October 26-30).

LIAISONS TD-60 (I. Doig, ETSI) contains an internal liaison report from SMG11 (Special Mobile Group - speech aspects) to WG5 on speech codecs and WG3 inband Signaling for TFO (Transcoder Free Operation). It offers information on high performance speech codecs which have been or are being produced for GSM and UMTS (Universal Mobile Telecommunications System). SMG11 is currently in the process of defining an adaptive multi rate (AMR) codec operating at rates probably between 4 and 16 kbit/s. TD-79 (L. Vreck, ETSI), an answer to TD-60, is an invitation for a SMG representative to present the different SMG codecs at the next meeting of WG5 in Portland (September 1, 1998). TD-26 (M. Cataldo, ETSI) is a liaison from SMG 4 (Special Mobile Group - data services) to Multimedia Terminal and Applications (MTA) noting SMG 4’s agreement that a European Profile for H324/M for use in GSM is desirable. TD-52 (G. Thom, Delta Information Systems) is a liaison from the Q14/16 June rapporteur’s meeting. It provides the new draft of Annex B of H.246 (interoperability between H series terminals and voice or voiceband terminals on the SCN) on the H.323 to voice/voiceband terminal interworking, and solicits input from TIPHON. JOINT MEETING OF TIPHON AND ETSI TC SECURITY TD-64 (S. Thomas, Transnexus) is a report of the ETSI TIPHON and ETSI TC Security joint meeting which reviewed the following documents. S. Thomas (Transnexus) was appointed the new special rapporteur for security. B. Adams (Deutsche Telekom) is the chair of the Technical Committee Security ad hoc group on TIPHON security. TD-56 (S. Verduci, Siemens) discusses firewall implementations in VoIP systems noting that current systems implement firewalls which leave all UDP (User Datagram Protocol) ports open above 1024 thereby exposing possible vulnerabilities. TD-23, STF 114 Report (G. Kimchi, VocalTec), notes that the ITU-T Q12-14/16 rapporteurs meeting June 8-11 discussed inter-gatekeeper communications. They are considering the use of DIAMETER (follow-on to IETF RADIUS) as well as RAS for that protocol. TD-51, TIPHON Security Profiles (S. Thomas, Transnexus), provides suggested text for Annex G: Interoperability Security Profiles. WG3 issued TD-51R1 which only provides security profile G.1 (no security service). TD-37 (H. Brockhaus & M. Euchner, Siemens) proposes additional WG3 security profiles. These profiles are intended for environments in which intranets are connected to the Internet through a firewall. The proposed WG3 exportable encryption profile in TD-48 (J. Toga, Intel) provides equivalent security to the SCN (Switched Circuit Network). WORKING GROUP 1, REQUIREMENTS

DOCUMENT STRUCTURE AND PUBLICATION DTR01002, Requirements for Service Interoperability - Scenario 2, now clearly distinguishes between clarifying text and requirements, which are presented in table form. Requirements can be referred to by unique numerical tags, which are presently in numerical order (this order will not be maintained). New requirements (e.g., with tag ‘64’ and ‘65’) can replace another (e.g., requirement ‘8’), and appear in the table between requirements ‘7’ and ‘9’. Annex C was added to trace requirements. The intention is to keep track of the progress of the work in TIPHON related to each requirement. In the example above, requirement ‘8’ would get a comment “replaced by ‘64’ and ‘65’ ”. Publishing Draft Technical Report (DTR) 01002, which is a requirements/scope document, before publishing the actual protocol documents (TIPHON Phase 2 deliverables) might lead to two problems: • Additional requirements might be identified while still in the process of studying issues • Some requirements could still be unfilled within the given time frame Therefore, WG1 agreed to publish DTR01002 at the same time as the protocol documents. MOBILITY TD-45 (D. Gurle, VocalTec) specifies requirements needed to provide roaming services across multiple administrative domains (an administrative domain is a business authority providing IP telephony services using gatekeepers and gateways or gatekeepers only [e.g., clearing house services]). The two scenarios requiring roaming services are:

• PSTN access to a visited IP domain via a Gateway- to a large extent a combination of pure VoIP roaming and PSTN access to the visited IP domain via a Gateway (e.g., via 1-800 number with two stage dialing) • Voice Over IP (VoIP) roaming, having IP access It was agreed to focus on the pure VoIP first. The general requirements for the pure VoIP roaming scenario are: • Naming/identification • Visited gatekeeper discover • Authentication The meeting agreed that mechanisms used for the support of a roaming user should be the same as for the non- roaming user whenever possible. TD-55, “Impact of Wholesale-Retail Settlements on GK-GK Communication” (M. Oulid-Aissa, Siemens), focuses on GK-GK interfaces required for a wholesale-retail business model. It focuses on interfaces required when the network resources are owned and managed by wholesalers (network owners) while the subscribers to these services are owned and managed by a retailer (service providers). The large similarity of the mobility problem space was identified for cases where, for example, a retailer owns a subscriber that appears in an IP telephony provider's domain. TD-55 contains some aspects that are not mobility specific, namely transfer of retailer or IP telephony provider's GW/GK directories. In TD-55, this information transfer is depicted as GK-GK information exchange. It was questioned whether this is more on a management level. M. Oulid-Aissa (Siemens) agreed that this might not be within the GK-GK interface. The issue was deferred. TD-28, “Requirements for Administrative Domains and Inter-working” (R. Stastny, Post & Telekom Austria/OeFEG), contains a section on mobility management requirements. TD-28 raises the issue that an IP telephony provider can provide different types of service, and that the requirements depend on the type of service. The different services will be described in the draft; the requirement tables will get a column indicating the type of service. TD-28 is in the direction proposed by the Chair to develop the WG1 document as a scope document of TIPHON Phase 2, including more explanatory/scope text around the requirements. The Chair and R. Stastny will propose the inclusion of suitable non-controversial material in TDR1002. The following items were agreed regarding authorization, accounting and billing: • The main addition of TD-55 with respect to TD-45 is the support of pre-paid services. • A standardized authorization between home and visited network is necessary. • It should be possible for a home network to keep a subscriber-specific credit real-time up to date, and that the visited network should be made aware of this requirement from the home network. • Accounting information could be transferred off-line in bulk. • Non-repudiation between different networks should be supported. This is already covered in the present requirements, but maybe should be made more specific in security profiles. Discussion on non-repudiation between user and visited network identified some problems; this issue is to be studied further. CALL DETAIL RECORDING (CDR) CONTENT TD-31 (R. Stastny, Post & Telekom Austria/ OeFEG) defines requirements for the different information elements to be exchanged between domains. The different information elements were discussed, and agreed upon after some clarification. The section on charge information (section 5.5) should be available in a billing center already. Since GSM Memorandum of Understanding (MoU) uses it, it was accepted until the GSM MoU rationale is provided and clarified. The content and syntax of the inter-domain Call Detail Recording (CDR) will be the first focus; the issue of optional and mandatory information elements will be addressed later. The issue of split CDRs is an active topic; further contributions are invited. NUMBERING/ROUTING TD-29 (R. Stastny, Post & Telekom Austria/ OeFEG) defines the requirements and provisions necessary for a Global IP telephony Directory Service (GIDS), including architectural requirements and the required organization behind it. The only specific mechanism for the support of mobility for users with a global VoIP number is the

consultation of the GIDS for the home network. WG4 requested a deferral of this paper, as they will discuss it in detail. TD-30, “Requirements for Inter-working with SS7 and ISUP” (R. Stastny, Post & Telekom Austria/ OeFEG) was not discussed, because it contains architectural requirements. ACTIONS LIST The drafting group will work on the following actions: • Security profile requirements list • Incorporating more scope information, based on TD-28 • Extend Annex A with more business role interaction examples • Continue work on mobility requirements • Update Annex C • Extend requirement tables with extra ‘IP telephony service type’ where appropriate, based on TD-28 WORKING GROUP 2, ARCHITECTURE TIPHON WG2 is chaired by J. Vandenameele (Alcatel). The major objectives of the meeting were to create the first draft of DTS/TIPHON-02002, Network Architecture and Reference Configurations - Scenario 2, and to update the list of topics for which contributions are requested. The WG2 Meeting Report is TD-13. Contact will be established with SMG1 (Special Mobile Group-services and facilities); a member of SMG will probably attend the next TIPHON meetings to determine how roaming could be achieved in IP telephony. GATEWAY INTERFACES AND FUNCTIONAL DECOMPOSITION TD-39, Introduction of ISUP (J. Holm & V. Gonzalez, Ericsson Telecom), suggests the architecture to be used when ISUP (ISDN User Part) is introduced. It explains the SS7 protocol family and how to access it. It also proposes text for changing DTS/TIPHON 2002, Network Architecture and Reference Configurations - Scenario 2. TD-53 (R. Scholl, ETSI STF 114) presents proposals for the decomposition of the H.323 Gateway into functional parts. These proposals resulted from the Q14/16 June 1998 Interim meeting on the gateway functional decomposition. TD-54 (M. Oulid-Aissa, Siemens) argues that the SS7 mediation function architecture should not be required to be coupled with the TIPHON GW. It proposes that it should be defined as a logical protocol mediation function with flexible allocation to GW and / or GK. TD-22 (F. Andreasen, Bellcore, and M. Lucchina, Cisco) proposes to include the Simple Gateway Control Protocol (SGCP) discussed within IETF in the TIPHON work as a communication protocol which integrates H.323 and the telephony systems. SGCP is a VoIP deployment which leverages existing telephony services. TD-22 recommends establishment of a liaison with the IETF WG where SGCP is debated. TD-30 (R. Stastny, Post & Telekom Austria/ OeFEG) provides requirements for interworking with SS7 and ISUP. It proposes to first consider basic calls for Scenarios 1 and 2, then to define interworking for Scenario 3, followed by additional supplementary services and IN services. It also proposes to specify the interface to SS7 before defining interfaces internally to the Gateway defined in TIPHON-2001. It suggests terminating the signaling links and the voice trunks on the same H.323 gateway. TD-40 is a joint contribution from a number of companies to the June 1998 Interim meeting of Q14/16 (APC- 1410, see CSR Vol. 9.5 page 51). It proposes that Q14/16 create a Recommendation defining the telephony gateway device control protocol. TIPHON should determine if a response is necessary. TD-61 (M. Holdrege, Ascend) describes the Reliable Signaling Gateway Control Protocol (RSGCP, an Internet Draft) also submitted to ITU-T SG11 and described at the last TIPHON meeting (TIPHON-7-TD-56, see CSR-T Vol. 9.5 pages 8-9). TD-43 (T. Hoshi, Hitachi) proposes a voice-multiplexing transfer method for IP telephony gateways. This method allows voice transfer with reduced header overhead and a decreased number of voice packets. A lengthy discussion took place on the several implementation options of a decomposed Gateway. The main conclusion of the group was that the basic questions have to be answered first, i.e., the need for the decomposition and the nature of the new reference point separating the new functional blocks, i.e., the Signaling Gateway and the

Media Gateway. TD-76 is the result of a drafting session. J-P. Albinet (Alcatel), the interim editor, will prepare a new draft of DTS/TIPHON-02002 using TD-76. MOBILITY AND ROAMING TD-46 (D. Gurle, Vocaltec) proposes requirements for mobility/roaming for TIPHON. It proposes to derive a global TIPHON architecture that fits scenarios for multi-domain calls and roaming services (including dynamic roaming agreements as defined by UMTS). It proposes to drive this architecture from DTS/TIPHON-02001 and ITU-T SG16 Q11-14 TD-19 Yokosuka, Japan April 1998, Terms of Reference for Annex G (Inter-Gatekeeper Communications). The basic approach as given in TD-46 was discussed in order to define a WG2 position for the joint meeting with ETSI SMG/DECT. Assuming that the roaming user always gains access to the IP domain through a Gatekeeper, the agreed upon approach for defining an architecture supporting mobility and roaming is to: • Define the concept of the border gatekeeper (as suggested by TD-19) • Define the concept of GSTN roaming as opposed to TIPHON terminal roaming • Define the functionalities required in the gatekeeper to support roaming services. • Define the necessary structure of information that has to be exchanged for roaming purposes between multiple administrative domains • Define necessary additions to the RAS protocol to (based on the inter-gatekeeper communication specified in ITU- T SG 16 Q11-14) GATEKEEPER-TO-GATEKEEPER COMMUNICATION TD-55, Impact of Wholesale-Retail Settlements on GK-GK Communication (M. Oulid-Aissa, Siemens), discusses the Gatekeeper-to-Gatekeeper communication in a wholesale-to-retail scenario. It suggests providing an agreed version of this TD to ITU-T SG16. TD-57 is a presentation on the use of the DIAMETER protocol for Inter-Gatekeeper Communication. TS/TIPHON-2002 T OPICS FOR FURTHER STUDY Contributions are solicited on the following topics: • Confirmation of the need for the functional decomposition of the Gateway • Issues involved with the distribution of Media Gateway devices and their relationship with the Signaling Gateway that is common to a number of Media Gateways • The information flowing across the reference point between the Signaling Gateway and the Media Gateway • Mapping of code points between SS7 and H.323 - H.225 - H.245 within the Signaling Gateway • Does the Signaling Gateway make decisions or only receive the calls? • Call scenarios for TIPHON Scenario 2 • The role of IN to provide interoperability functions • Architectural model on Accounting/Charging/Billing (asked by WG1) covering functions within the functional blocks, and their relationships DTR/TIPHON-2004 (MOBILITY ASPECTS) Contributions are requested on the items listed under Open Issues in the first draft (V.1.0.0) of this deliverable. LIAISONS TD-27 (G. Smith, SC6/WG6 Convener) is a liaison response from ISO/IEC JTC1/SC6/WG6 (responsible for PISN [Private ISDN] including PSS1 [QSIG]) indicating activities of its working group relevant to TIPHON. It notes their interest in ensuring correct interworking between IP-based telephony and PISNs. TD-60 (see general liaison, above) also provides comments to DTS/TIPHON-02001 about the E4 reference point and Calling Line Identification (CLI). Regarding SC6 WG6’s comment (Section 2) on the nature of the E4 reference point: The meeting agreed that the comments might be valid but relates to implementation issues. Since TS/TIPHON-2001 is a functional specification, it does not address implementation issues. Hence no action is required. Regarding SC6 WG6’s comment (Section 3) on CLI: “network” will be replaced by “IP network” or “SCN network” as applicable in the new version of TS/TIPHON-2002.

TASKS FOR STF 114 WG2 asked STF 114 to address questions related to the decomposition of the Gateway, especially the nature of the new reference point N and information flowing across it. WORKING GROUP 3, CALL CONTROL G. Meyer, (Siemens) is the WG3 chair. The meeting report is TD-14. DTR/TIPHON-03001, Using GSM Speech Codecs Within H.323, was approved at project level. TD-41 and TD-42 (S. Moore, Siemens) provide technical and editorial comments (respectively) for inclusion in DTS/TIPHON-03002, Call Control Flows for Basic Calls From an H.323 Terminal to an SCN Terminal. DTS/TIPHON-03002 was updated after a thorough review of the main body of the text and the normative Annexes. The informative annexes were not reviewed due to lack of time. Notwithstanding any editorial corrections, the reviewed part of the document is considered as stable (version 1.5.2). The annex containing security profiles is not yet included. As DTS-03002 is getting very late, only written contributions requesting major changes in the current text will be taken into account; the deadline for change requests is August 24. The schedule for DTS/TIPHON-03004, Inter-Domain Pricing, Authorization and Usage Exchange, has not been changed. WG3 reviewed DTS/TIPHON-03004 and issued revision 1.2.0. There were some outstanding issues; therefore WG 3 did not approve the document. WG3 sought advice from the plenary. WORKING GROUP 4, NAMING, ADDRESSING L. Spergel (Lucent) is the WG4 chair. The meeting report is TD-15. The objectives of the WG4 meeting were to support SG2 activities and to make progress on the DTS-04002 deliverable, “Naming and Addressing - Scenario 2.” The ITU-T SG2 Q1/2 (Applications of numbering and addressing plans for fixed and mobile services) and Q10/2 (Management and development of PSTN-based telecommunication services) met June 15-16 in Turin. TD-68 (R. Stastny, PTA) reports on the meeting. The experts in SG2 feel that TIPHON WG4 has not provided enough information in terms of administration and call resolution. Also, SG2 will need an official request for a global country code to address IP-telephony users world-wide. The next meeting of the SG2 (network service and operation) experts is scheduled for September 28. It was decided to focus on progressing DTS-04002 at this meeting and to postpone discussion of SG2 strategy until the Aug 31- Sep. 4 TIPHON meeting in Portland. DTS-04002, NAMING AND ADDRESSING - SCENARIO 2 The following contributions were presented towards development of DTS-04002: TD-24 (G. Kimchi, ETSI) proposes a scheme for allocating numbers within a global E.164 country code by using the class structure of the IP address range to allocate phone numbers. TD-67 (L. Spergel and P. Sijben, Lucent) notes that this limits the number of users that can be hosted from a particular network, especially class C networks. TD-67 proposes some extensions that mitigate these problems. TD-29 (R. Stastny, PTA/OeFEG) provides a definition of the requirements and provisions necessary for a Global IP- Telephony Directory Service (GIDS). The GIDS is required to locate E.164 Global Code telephone numbers on the Internet and other IP-based networks. TD-32 (S. Rulfs, Deutsche Telekom) proposes editorial and explanatory amendments to DTS-04002. The additions were accepted. TD-42 from TIPHON 6 in Santa Clara (Feb. 1998, S. Moore, Siemens) provides input on private numbering plans. It was accepted and adapted to the current draft. The proposals above were all considered valid and will be written into the draft. It was agreed to add a section on SCN (Switched Circuit Network) routing. Contributions are requested. DTS/TIPHON 04002 1.1.4 is scheduled for WG approval at the next meeting.

LIAISONS No liaisons were received. It was suggested that liaisons should be sent to standards groups working on local number portability to make them aware of this technology. These liaisons were deferred until the appropriate groups are identified. WG4 ACTIONS The following actions should be completed by the next meeting: • STF will investigate database technology, amount of expected traffic, and database access times. • L. Spergel (Lucent) will investigate how International Freephone and UPT are routed in the US. WORKING GROUP 5, QUALITY OF SERVICE B. Castle (3Com) is chair of WG5. TD-16 is the meeting report. The primary objective of this meeting was to approve draft deliverable DTR/TIPHON-05001. Version 1.2.3 was approved. TD-34 (K. Adler, H. Klaus, & J. Pomy, STQ) is a tutorial example for the relationship between TELR (Talker Echo Loudness Rating), mean one-way delay and Id (delay impairment value). TD-35 (K. Adler, H. Klaus, & J. Pomy, STQ) is an overview of the resulting end-to-end speech quality for the combination of the different network classes working together with the different device classes. TD-38 (K. Adler, J. Pomy, & H. Klaus, STQ) provides comments and additions to DTR/05001 V1.2.1 (presented at TIPHON 7 Meeting as TD-66). TD-44 (L. Kahn, Net Insight AB) describes DTM (dynamic synchronous transfer mode), a networking technique for IP traffic directly over optical fibers. TD-44 suggests the use of DTM for IP telephony. This presentation proposes DTM rather than ATM as an appropriate technology for delivering real time QoS for voice and multimedia services. During the final review of DTR/TIPHON-05001 (Deliverable 1), General Aspects of Quality of Service (QoS) - Scenario 1, WG5 held a lengthy debate on: • Inclusion of acoustic measurements • Objective versus subjective MOS measurement • Effects of jitter on QoS measurement • Use of codec characteristics as a basis for comparison of QoS Further discussions were held to progress the approval of the deliverable. The modified document (V1.2.3) was approved by WG5. It should be approved by TIPHON at the next meeting. A Birds of a Feather (BOF) group was held to discuss possible requirements for Signaling for QoS; it was agreed to create a new Work Item to specify these requirements. Deliverable 2 was not progressed and will probably not be elaborated until WG6 has carried out validation and measurement of QoS based on WG5’s Deliverable 1. The E-Model (end-to-end QoS model) will be discussed in detail in Portland (August 31-September 4) and, if possible, an E-Model software package will be demonstrated. WORKING GROUP 6, VERIFICATION M. Blaschitz (Infonova) is chair of WG6. TD-17 is the meeting report. DTR-TIPHON-06001, Verification and Demonstration Implementation (VDI); Implementors handbook and Test Reports - Scenario 1, was approved at project level. A list of missing information has been identified in clause 4. This information should be provided before the next meeting otherwise the corresponding sections of the document will be removed. The document will then be approved at the project level and published. TD-36, TIPHON Questionnaire: user acceptance of VoIP (C. Hauber, A. Mayer, Siemens), presents the results of the first user tests. The tests have primarily been conducted to improve the questionnaire. It was decided to update TIPHON(98)02 with the content of TD-36. The new permanent document reference is TIPHON(98)02rev1. The next tests to be conducted concern the QoS levels identified in WG5.

TEN-TELECOM CONSORTIUM M. Blaschitz presented the TEN-TELECOM (Trans European Networks, established by the EU) consortium project outline. The main trial scheduled for the beginning of next year will cover ten countries, ten service providers and around 2000 users. The TEN-TELECOM consortium offered support to TIPHON, especially for validation of the specifications, demonstration and interoperability testing. Companies are still invited to join the consortium. NEW TIPHON NET EQUIPMENT TD-73, Equipment Contribution Tiphon-net (H. Daanen, Hewlett Packard), notes that HP will provide interested TIPHON WG6 members with a software upgrade for the protocol analyzer “internet advisor.” This upgrade includes protocol support for the H.323 protocol stacks.

TIPHON #8 MEETING ROSTER, JUNE 16 – 19, 1998, H ELSINKI, FINLAND Helmut Schink, Siemens TIPHON Chair, [email protected] 3Com Barry Castle [email protected] 3Com Chris Haslam [email protected] 3Com Corporation Paul Ostergaard [email protected] Alcatel Bell Jozef Vandenameele [email protected] Alcatel SEL Klemens Adler [email protected] Alcatel Telecom Jean Pierre Albinet [email protected] ART Didier Chauveau [email protected] Ascend Communications Matt Holdrege [email protected] AT&T Romeo Zwart [email protected] Bellcore Flemming Andreasen [email protected] Bellcore Christopher Celiberti [email protected] Bellcore Hong Liu [email protected] BT Morgan Potter [email protected] BT Colin Smith [email protected] Cable&Wireless Communications Tony Anvoner [email protected] Cablelabs David Bukovinsky Cegetel / SFR Philippe Lucas [email protected] Cisco Systems Inc. Massimo Lucchina [email protected] Clarent Corporation Dave Keeler [email protected] CSELT Michele Festa [email protected] DataBeam Europe Ltd Neil Starkey [email protected] Deutsche Telecom Berkom GmbH Harald Klaus [email protected] Deutsche Telekom Stephanie Rulfs [email protected] Deutsche Telekom AG Bernd Adams [email protected] Deutsche Telekom Berkom GmbH Ingmar Kliche [email protected] Deutsche Telekom Berkom GmbH Thomas Scheerbarth [email protected] Dialogic Corporation Steven Magnell [email protected] DTI c/o Horrocks Technology John Horrocks [email protected] ECI Telecom (IAEI) Ahron Segev [email protected] Ericsson Jarle Fjortoft [email protected] Ericsson Eurolab GmbH Frank Eckstein [email protected] Ericsson Radio Systems AB Mats Folkesson [email protected] Ericsson Telecom Ulf Thune [email protected] ETSI Laurence Ferrand laurence.ferrand@etsi fr ETSI Gur Kimchi [email protected] ETSI Reinhard Scholl [email protected] ETSI Laurent Vreck [email protected] EURESCOM Magnus Krampell [email protected] Europolitan AB Stefan Persson [email protected] Finnet Group Markku Laasonen [email protected] Finnet Group Pekka Nieminen Finnet Group Jari Pohtio [email protected] Finnet Group Maria Valli [email protected] France Telecom Olivier Hersent [email protected] GPT Ltd Philip Mart [email protected] GRIC Communications Richard Brennan [email protected]

GRIC Communications Michael Hayden [email protected] Hewlett Packard Hans Daanen [email protected] Hewlett-Packard Labs Stephen Hinde Hitachi Ltd Tohru Hoshi [email protected] Hitachi Ltd Keiko Tanigawa [email protected] Intel Corporation James Toga [email protected] iPass Inc. Butch Anton [email protected] KPN Michel Bais [email protected] KPN Daniel Madden [email protected] LM Ericsson Per Döfnäs [email protected] LM Ericsson Jan Holm [email protected] LM Ericsson AB Lucas Klostermann [email protected] Lucent Technologies Glen Freundlich [email protected] Lucent Technologies Emilio Antonio Mastromartino [email protected] Lucent Technologies Louise Spergel [email protected] Lucent Technologies Paul Sijben [email protected] Lucent Technologies UK John Magill [email protected] Lucent Techonologies Mike Buckley [email protected] Mediatrix Telecom Francois Menard [email protected] Motorola Ted Hatala [email protected] Motorola UK Ltd Andy Mullan [email protected] Motorola- SATCOM Willy Verbestel [email protected] MSAF, Inc Ronald Hirst [email protected] NEC Technologies(UK) Ltd Neil Lacey [email protected] Net Insight AB Lars Kahn [email protected] Netspeak Corporation Jeff Orwick [email protected] Nokia Telecommunications Hannu Asujamaa [email protected] Nokia Telecommunications Janne Koistinen [email protected] Nokia Telecommunications Haluk Tekbulut [email protected] Nokia Corporation Timo Taskinen [email protected] Nokia Research Center Shkumbin Hamiti [email protected] Nokia Research Center Sirpa Kuisma [email protected] Nokia Research Center Mikko Paavonen [email protected] Nokia Research Center Pekka Pessi [email protected] Nokia Research Center Marko Suoknuuti [email protected] OFCOM René Koch [email protected] OFCOM (Federal Office for Com.) Olivier Girard [email protected] OFTEL Dave Simpson [email protected] Philips Business Communications Frank Derks [email protected] Post Telekom Austria (PTA) Klaus Sambor [email protected] Post&Telekom Austria Poul Muzak [email protected] PTA Michael Blaschitz [email protected] PTA/ÖEFEG Richard Stastny [email protected] Radvision Inc. Shykeh Gordon [email protected] Robert BOSCH GmbH Matthias Bien [email protected] Robert BOSCH GmbH Joachim Pomy [email protected] SAGEM Michel Menu Siemens AG Hendrik Brockhaus [email protected] Siemens AG Gunter Kleindl [email protected] Siemens AG Juha Korpi [email protected] Siemens AG Angelika Mayer [email protected] Siemens AG Gerald Meyer [email protected] Siemens AG Klaus Nimphius [email protected] Siemens AG Helmut Schink [email protected] Siemens AG Wilhelm Wimmreuter [email protected] Siemens GEC Steve Moore [email protected] Siemens Oy Jonas Malmström [email protected] Siemens Telecom Networks Mourad Oulid-Aissa [email protected] Siemens Telecom Networks Sergio Verduci [email protected] Sonera Corporation Jouko Saras [email protected] Sonera Corporation Sampsamatti Tanner [email protected] Telia Stefan Berggren [email protected] Telia Research Niklas Johansson [email protected] Telia Research Roberto Zamparo [email protected]

Texas Instruments Gerardo Murillo [email protected] TransNexus Stephen Thomas [email protected] Trillium Digital Systems Inc. Venu Madhav Kailasa [email protected] UNISYS Gerfried Handke [email protected] Vocal Technologies Ltd Juan Alberto Torres [email protected] VocalTec Communications Ltd David Gurle Vocaltec Communications Ltd Scott Petrack [email protected] Vodafone Ltd Piers Wilson [email protected]

REPORT OF ETSI ANALOG TERMINALS AND ACCESS (ATA) MEETING JUNE 22 – 26, 1998, STOCKHOLM, SWEDEN The Fourth Analog Terminals and Access (ATA) meeting, chaired by N. Encarnação (OFCOM), attempted to operate completely without paper copies of documents. The agenda (TD-01) was agreed and the report of the third ATA meeting (TD-05) was accepted. The reports of the ATA rapporteur’s meetings in London (ATA PD 98039) and Lannion (May 1998, TD-39) were approved as was the report of the conventional technologies working party meeting in Sophia Antipolis (ATA PD 98040). B. Hansen (Nortel) who was vice Chairman and leader of the ATA electronics group has resigned as Nortel will no longer support two representatives on ATA. U. Jansson (Ericsson) was appointed coordinator for the electronics group and acting vice-Chairman. The ETSI server has been further revised and improved. The technical bodies dealing with Corporate Networks (CN) and Multimedia Terminals and Access (MTA) have been closed. The Chairman apologized to W. Mellors (WM Services) for inducing him to be a rapporteur for a work item (Analog Terminals and Access) and said that when he found that W. Mellors was not an ETSI member, the document that had been prepared (TD-23, dealing with Analog Terminals and Access) had to be withdrawn. W. Mellors was at the meeting in an observer capacity representing the User Group. TR 101 149 (Test Simulation For Voice Equipment), TR 101 150 (Report on the Application of TBR 21) and TR 101 183 (Analog Ringing Signals) have been approved by committee vote and published by ETSI. The Chairman also reported the approval by national voting and publication of TBR 38 (Essential Requirements for Handset Tele- phony), ETS 300 778-2 (On-Line Data Transmission), and ES 200 677 (Requirements for Handset Telephony). The ATA meeting agreed to start the process for the withdrawal of I-ETS 300 677 (the voluntary standard on handset telephony) since it has been superseded by ES 200 677. The Chairman reported that ATA would be taking over the terminals work from Corporate Networks (CN) and Multimedia Terminals and Access (MTA). He also reported that DTA (Digital Terminal and Access Project) is having difficulty getting rapporteurs and that there was some support for the idea of turning ATA and DTA projects into a single terminals committee. R. Ceruti (CSELT) said that many companies now find it difficult to support standardization projects. TD-11 is an exchange of correspondence between the chairmen of CN and ATA on the handover of the work. C. Harley (BT) reported little progress on ES 201 235 dealing with DTMF receivers and transmitters, due to the priority of other work. He originally offered a listing of national power feed requirements (TD-56, DTMF - Tables for review), but it was agreed to use statements of maximum and minimum currents. Further work is scheduled to be done before the next ATA meeting (December 4-7, 1998, South Africa). The Chairman wishes to have an early second edition of EG 201 121 (the TBR 21 Application Guide) containing updated Advisory Notes. It was agreed that future editions, where the only changes were updates of the Advisory Notes agreed by TRAC (Technical Recommendation Application Committee), could be approved by the Chairman as editorial changes. A work item to cover this is already in place. It was announced that ETS 300 001 (Attachments to the PSTN; General technical requirements for equipment connected to an analog subscriber interface in the PSTN) will shortly be updated to Edition 5. Notice will be given to National Standards Organizations to allow them to input late updates before planned publication in October. TD-49 (TRAC Chairman) suggests that ATA press on with work updating the TBR 21 guide.

TD-48 (TRAC Chairman) asks ATA to delay any discussion on the new RTTE (Radio and Telecommunications Terminal Equipment) Directive until the TRAC Guidelines on the subject have been produced. TD-16, a record of exchanges between the ATA Chairman and the Chairman of ETSI NA (Network Aspects) on service descriptions was noted, as was TD-61 from NA 2 on proposed PSTN Display services clarifications. The liaison to NA 2 (Numbering, addressing, routing & Interworking) in TD-29 was agreed. It provides service descriptions for new display services and enhancements of the message waiting service. NEW WORK ITEMS TD-17, Proposal for a new Work Item: NTP of analog PSTN interface (P. Dofnas, Ericsson et al), covers two work items which were approved for both an ETSI Guide and a Technical report on the harmonized network interface set out in TD-12. TD-12, draft DTR/TM-04070, Requirements for an Analog UNI dedicated to the access networks terminated by a stand-alone unit at the customer’s premises, was received as a liaison from ETSI TM 4 (radio relay systems). J. Long (DTI) pointed out that the bandwidth specified in the return loss masks was insufficient for the correct operation of modern modems. P. Dofnas (Ericsson Business Networks) was appointed Rapporteur for the work set out in TD-12 for a harmonized network interface. TD-18 (W. Mellors) proposes a Technical Report (TR) listing those ETSI documents that had been published by ATA or which were currently its responsibility. The work was opposed by J. Long (DTI) although the need for the information was endorsed by the members present. The work item was rejected but it was agreed that the secretariat would publish the information on the ATA web site. Rapporteurs were asked to input abstracts of their documents to be included with the information. New work items were agreed on Advice Of Charge (AOC, TD-62, France Telecom), and on Terminal Selection (TD- 63, CSELT), both using PSTN protocols for display services over the local loop. To speed up publication of the terminal support interface guide (DTR/ATA 101 185), it was agreed to publish the document first as a Technical Report before publication as a Guide. This required a new work item (TD-65). TD-03 contains a list of active Work Item as of the start of this ATA meeting. It was agreed to cease the work item EN 301 291 on the requirements for remote meter reading as there is no longer any support for the activity. LIAISONS B. Martensen (Ericsson) will take over the liaison function with TC-TM (Technical Committee Transmission and Multiplexing). W. Mellors (WM Services) and B. Martensen (Ericsson) will provide liaison from and to the User Group respectively. TD-13, CENELEC/ETSI draft Report on Resistibility requirements, was received from the CENELEC/ETSI joint working group. Resistibility is defined as the ability of equipment having telecommunications ports to withstand specified effects of electrical, magnetic and electromagnetic phenomena. TD-14 provides TC205 (Home & Building Electronic Systems) WG 5 guidelines for connecting home and building’s electronic systems to other networks (March 5, 1998). TERMINAL SUPPORT INTERFACE, EG 201 185 The Chairman announced that he wanted to complete work at this meeting on draft EG 201 185, the Guide on a Terminal Support Interface for analog PSTN terminals (which was not input as a TD), with agreement at the latest within one month from the end of the meeting. TD-19, Interface a/b (internal) (W. Schellhaas, Deutsche Telekom), describes in detail a similar interface used in Germany. Germany wanted the dc supply conditions in the draft aligned with those in their comment which specify the supply in terms of available current. TD-45 (KPN Telecom) suggests changes to the connection arrangements and calls for clarification on a number of points. TD-46 (CSELT/Telecom Italia) makes a number of constructive suggestions for improvements to the document. TD-53 (Telkom SA) proposes a number of minor changes to improve the document, most of which were accepted. Telkom SA wanted the available current restored to 32 ± 7 mA. France wanted to permit supply voltages as low as 12 Volts but it was pointed out that this could create difficulties with many terminals. Most discussion centered upon three areas:

• Problems created by Commission work in a similar area (in TD-40 [S. Davidson, PbT Consultants] which deals with a network termination point) • Members worrying about whether the guide might be applied to PSTN access • The likelihood of the document being misused for regulatory purposes There was discussion about the potential conflicts between the draft and TD-40 (S. Davidson, PbT Consultants) on a similar network terminating point, a result of work done for the European Commission. TD-40 provides guidelines for the technical specification of a 2-wire analog Network Termination Point which supports harmonized terminal equipment. TD-12 is draft DTR/TM-04070, input as a liaison from TM 4. It describes the requirements for an analog User Network Interface (UNI) dedicated to the access networks terminated by a stand-alone unit at the customer’s premises. It was concluded that if conflict did exist it would be between TD-40 and TD-12, which both deal with network interfaces. Other difficulties include the low seize current proposed (4 mA); France Telecom (J. Montenot) had problems providing the power necessary for some of the proposed feed conditions. During discussion it was decided to describe the interface as a “harmonized” terminal support interface. As a result of the discussions, the following changes were made: • It was agreed in section 6.1 to require a minimum current of 18 mA with a recommendation that the range should be 32 ±7 mA. In section 6.2.2, the maximum open circuit voltage was raised to 80 V and the minimum voltage with a 100 kΩ load was raised to 38 V. • The value of the seize resistor in 7.2 was raised to 7.25 kΩ , and the time for dial tone to appear was extended to 2.0 seconds. • Section 8.2 was amended to allow for two types of network clearing, a break pulse and a polarity reversal. • In 10.7, the receiving noise limit was specified as 70 dBV with a complex termination. Other changes were mainly editorial. The rapporteur will update the document. LOOP DISCONNECT SIGNALING (ES 201 187) P. Erasmus (Telekom SA, ES 201 187 Rapporteur) opened discussion on TD-15 (ES 201 187, V0.3.0, Loop Disconnect dialing). There were complaints from Germany and Austria (S. Wust, Deutsche Telekom, supported by G. Magdoin, Austria Telecom, Swisscom, Telenor AS, and KPN, in TD-57) that the document does not guarantee operation on all of their old systems. TD-59 (TESTCOM, Czech Republic) contains proposals for amendments. During the discussion, Norway announced that loop disconnect dialing would no longer be supported on some of their exchanges. TD-64 and TD-15r2 give details of the changes implemented in the document. TBR 37, ACCESS REQUIREMENTS FOR VOICE A draft of TBR 37 (the access requirements for voice equipment) was not available and discussions were somewhat confused as the group was waiting for instructions from the regulatory authorities as to whether TBR 37 should still go ahead or become part of TBR 21. The message then came from ACTE (Approvals Committee for Terminal Equipment) that TBR-37 should continue to Public Enquiry. TD-24, and TD-25 (both from France Telecom) support France Telecom’s 60 mA current limitation requirement. J. Montenot (France Telecom) requested that the document be reduced to a Delta document from TBR 21 so that the subject of their current limit would not be subjected to further scrutiny. This approach was strongly supported by J. Long (DTI). F. Howett (Nortel) wanted the document published as soon as possible so that it could be used by industry. He suggested that comments on clauses that had been settled in TBR 21 could be ignored at Public Enquiry. N. En- carnação (OFCOM) said that such comments must be considered before being discarded. J. Long (DTI) proposed deleting all of the words which were the same as TBR 21 and just saying “See TBR 21.” F. Stafnes (Telenor) ob- jected: he would prefer to see TBR 37 as a single complete document. S. Willemsen (Siemens) was insistent that the agreement on operating currents (contained in TBR 38) should be included in TBR 37 as well. There was opposition from C. Karlsson (Telia) on the wording of this “concession.” The negotiations continued outside the meeting. A German/Swedish compromise on the operating currents in TBR 37 was reported in the final plenary. Equipment is to be tested with 2,800 Ω feeds unless the supplier states that the equipment is not intended to be used on long lines, in which case 2,300 Ω would be used.

The rapporteur (C. Harley, BT) said that he had incorporated the compromise and had followed J. Long’s (DTI) suggestions in modifying the document to the Delta document requested by France Telecom. The work was not completed during the meeting. A copy will be made available on the ETSI server (private) as EN 301 437 following the decision that new TBRs should be published as ENs (European Norms). ENHANCED SERVICES Very little progress was made in the session on enhanced services. A number of documents were input following the Lannion meeting (May 1998) but were not taken to approval. TD-27 (G. Engstrom, Telia AB) proposes the technical implementation of Advice of Charge (AOC); TD-28 (G. Engstrom, Telia AB) proposes technical implementation of the “call type” parameter. TD-29 is a liaison to NA2 (Network Aspects) on enhancements to ETS 300 659-1 and ETS 300 778-1. TD-30, TD-31, TD-37 and TD-38 (all from G. Engstrom, Telia AB) deal with multiple subscriber numbering (MSN), which permits the addressing of a particular terminal or group of terminals at the receiver’s end, and User Type, which permits the addressing of a particular terminal type. TD-33 contains a service description of a short message service (SMS); TD-34 describes its technical implementation (both from G. Engstrom, Telia AB). TD-35 (F. Howett, Nortel) proposes a service for user provided number where the CLIP (Calling Line ID Parameter) number is different from that to which a return call should be addressed. TD-36 (G. Engstrom, Telia AB) describes the use of a terminal selection number and a terminal use number. TD-44, Extension of pr ETS 300 778-1 and ETS 300 659-1 (W. Neumann, Deutsche Telekom), proposes an e-mail message waiting facility; TD-55 (P. Lottin, France Telecom) proposes a service description for advice of charge. Many of these services were proposed originally by Deutsche Telekom who wished to market PSTN services equivalent to those used on the ISDN. It was realized that little progress could be made without more detailed stage 1 descriptions of the services being proposed, so matters were delayed until a meeting with NA2 in October. The miscellaneous work item MI/ATA-005052 monitoring work on Advice of Charge was closed, as was C. Harley’s (BT) work item DEG/ATA-005072 review and recommendations arising from a study into parameter fields in display services. Some of this latter work will be included in the framework of TR 101 292 on the requirements to support enhancements in display service protocols; this work item was reported as progressing well. It was agreed to propose new work items on Advice of charge and on Terminal selection. TD-32 (U. Jansson, Ericsson Telecom) provides a parameter listing for call setup, messaging waiting indictor, advice of charge and short message service; TD-47, Message and Parameter Types used within ETSI and Bellcore (Deutsche Telekom), lists message types and parameters; both were presented for information. TD-38 (G. Engstrom, Telia AB) is a report of the User type and MSN at the ATA May meeting in Lannion. EN 301 071-1, S ERVER DISPLAY AND SCRIPT SERVICES The Chairman asked the meeting to agree that EN 301 071-1 (on server display and script services) could go for national vote now that it had received the necessary IPR endorsement from Bellcore. C. Harley (BT) entered a late objection (TD-58) on the grounds that the document breached ETSI rules in that it does not contain tests required to demonstrate compliance, even for the additional aspects covering European networks. BT would not object to the document being published as anything other than an EN (European Norm). BT’s objection to EN 301 071-1 was supported at the final plenary, and it was agreed to change the work item to publish the document as ES 201 071 rather than as an EN. The reference to Part 1 was removed from the title after the work item on Part 2 (the enhanced standard) was closed due to lack of support. A further work item was agreed to publish the document quickly as a Technical Report (TD-66, Draft WI Sheet for TS 101 071). This procedure, to publish the document first as a Technical Report (which only requires committee approval) speeds up initial publication as an ETSI Standard requires a members voting procedure.

USER LEVEL INTERFACES TD-43 (W. Mellors, as Specialist Task Force leader of STF 117) notes that work is ongoing in TC-HF (Technical Committee Human Factors) to set up a register of service codes; W. Mellors described the proposed procedure for the allocation of such codes. TD-20 (W. Mellors, User Group, same as TD-41) describes work in the User Group on a residential gateway. W. Mellors asked members to provide information on any ATA standards that are relevant to the work. J, Long (DTI) pointed out that in the current liberalized environment, it was not the function of the telecom operator to define the requirements for terminal equipment. A liaison to this effect to TC-HF User Group (TD-67) was drawn up and agreed. TD-42 (W. Mellors, User Group) proposes a universal interface for telephony terminals which would permit the connection of facilities for disabled users. The proposal arose from the Working Group for Hearing Impaired in the UK. W. Mellors asked for comments on the feasibility and likely price. The proposed interface is similar to that for ISDN equipment specified in I-ETS 300 245-4 and is based upon work on an interface for cordless headsets in a European industry forum. OTHER HIGHLIGHTS TD-09 (Chairman) sets out possible structures for ATA documents. There was no objection to it being made a permanent committee document. W. Mellors (User Group) asked for technical comment as to the correctness of TD-26, Multimedia and xDSL, before he circulates it among the User Group. TD-26 proposes that ATA institute a work item to report on the im- plications of various forms of digital delivery (known as xDSL) and their interactions with other analog services provided over the local loop. The purpose would be to further existing knowledge and provide early guidance to regulators. TD-50, Definition of required splitter parameters for VDSL and ADSL (B. van Leerdam, KPN), and TD-51, Input for a brainstorm on splitter filter requirements (B. van Leerdam, KPN), both deal with splitter filter requirements for ADSL. The creation of an ETSI/CENELEC Joint Committee on safety was noted. J. Long (DTI) noted that there had been no input to ATA from A. Mullen (Motorola). The new arrangements would remove the need for liaison on the subject. It was decided to close the miscellaneous work item on safety and EMC (ElectroMagnetic Compatibility) liaison. P. Dofnas (Telenor) agreed to write a report on EMC to be put on the exploder. The work item for ES 201 184 (ETSI Standard for Multi-Line Equipment) was changed to a TR (Technical Report). The amended draft (TD-21, with amendments in TD-54) was renumbered as TR 101 184; it was provisionally approved for publication although J. Long (DTI) suggested that there were a number of editorial problems in the document. A new work item (TD-22) was agreed for the same document to be published as an ETSI Guide (EG). TD-60, TR 101 182 on definitions, abbreviations and symbols, was approved for publication. The updated advisory notes for the second edition of EG 201 121 (the TBR 21 application guide) had not been completed in time for copies to be available at the meeting; the document will be put on the ATA server. Walter J.G. Mellors, WM Services

The next issue of Communications Standards Review – Telecommunications (Vol. 9 #7) is scheduled for October-November 1998.

ATA MEETING ROSTER, JUNE 22 - 26, 1998, S TOCKHOLM, SWEDEN Nuno Encarnação (OFCOM) ATA Chairman Host: Ericsson Austria Telekom Austria AG Gustav Magdoin Belgium CEC Philip Jepsen Czech Rep. Testcom Prague Zdenek Gutter Denmark Danish Nat’l Telecom Agency Helene Jensen Finland Finnish Telecom Admin. Antero Saarinen France Alcatel Jean-Marie Notter France ETSI Secretariat Claire d’Esclercs France France Telecom Jerome Descos France France Telecom Philippe Lottin France France Telecom Jean Montenot France TRT Lucent Technologies Thierry Salaun France TRT Lucent Technologies Yannik Schifers Germany Cetecom GmbH Mattias Geier Germany Deutsche Telekom Werner Neumann Germany Deutsche Telekom Werner Schellhaas Germany Deutsche Telekom Stefan Wüst Germany REG TP Christina Gandyra Germany Siemens AG Ulrich Kortegast Germany Siemens AG Stan Willemsen Germany TDK Electronics Europe Peter de Wit Ireland Telecom Eireann Pat O’Keeffe Italy CSELT Rodolfo Ceruti Italy CSELT Fabrizio Provenzale Italy ERISUD Pasquale Plaitano Italy Telecom Italia Paolo Vitiello Netherlands KPN Bert van Leerdam Netherlands KPN Jo Salemans Norway Norwegian Post and Telecom Authority Eskil Elness Norway Norwegian Post and Telecom Authority Jan Nergård Norway Norwegian Post and Telecom Authority Gunn Röym Norway Telenor R&D Finn Stafsnes S. Africa Telkom SA Ltd Pieter Erasmus Sweden Ericsson Business Networks Per Döfnäs Sweden Ericsson Business Networks AB Berndt Martenson Sweden Ericsson LM Urban Jansson Sweden Telia AB Göran Engström Sweden Telia AB Rustan Gandvik Sweden Telia AB Christer Karlsson Switzerland OFCOM/BAKOM Nuno Encarnação Switzerland Swisscom Konrad Gysi UK British Telecommunications Chris Harley UK CEC consultant Michael Brenton UK DTI John Long UK ETSI User Group representative Walter Mellors UK Motorola Trevor Hizzard UK Nortel Fred Howett UK OFTEL Martin Harris

August – September 1998 Vol. 9.6 Copyright © CSR 1998 41 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATION REPORT OF ETSI TM6 ACCESS TRANSMISSION SYSTEMS ON METALLIC CABLES MEETING, JUNE 22 – 26, 1998, LULEA, SWEDEN H.-J. Frizlen (Ericsson) is Chairman of TM6, TD-01 is the Agenda; TD-02, is the “Summary of Work Items,” extracted from the ETSI database. Telia hosted the meeting; 67 delegates from 15 countries attended. Part of the reorganized TM3 (Interfaces, Architecture and Functional Requirements of Transport Equipment) will join TM6; they will hold parallel meetings twice a year. A joint session will discuss issues in common. TM6 will need to keep abreast of the activities in the new SPS-9 (Signaling, Protocols and Switching - Access Networks), which deals with access networks, service nodes, and performance issues that may overlap those covered by TM3. Mr. Gindle (Austrian Telekom) will establish a TM6 acronyms and terms list. ITU-T More than 100 contributions dealing with G.dmt, G.hs, G.lite, G.ploam, G.test were presented at the Study Group 15 Question 4 held in Sophia Antipolis. Some TM6 delegates have reservations on some issues: • Q4/15 should not begin work on a Very high speed ADSL (VDSL) until ETSI and T1E1 complete their work. • G.lite seems to be North America driven; it should be expanded to address global issues. • G.dmt (ADSL) seems to be moving away from compatibility with T1E1 T1.413 Issue 2. It was suggested that a liaison be sent to Q4/15 to address the latter issue. ADSL L. Magnone (CSELT) is the Asymmetric Digital Subscriber Loop (ADSL) Rapporteur. TD-15 (L. Magnone, CSELT) is the report of the Interim Expert Meeting on ADSL over ISDN (Geneva, June 2-3, 1998). TM6 reviewed a draft of MI/TM 06006, Annex B (ADSL operation over ISDN, G.961 Appendices I and II) G.dmt. It will be sent to ITU-T SG15 Q4. WD-08 is the cover letter. A new Living List will be created after the TM6 meeting. TD-28, “Power Cutback in Downstream for ADSL over ISDN” (P. Reusens and S. Claes, Alcatel), proposes revising the upstream/ downstream ratio in ANSI T1.413 for ADSL over ISDN. The ANSI T1-413 specifies measurement of power upstream in increments of 1 dB and power downstream cutback in steps of 2 dB. A total downstream power cutback of 12 dB is used on short lines to reduce the dynamic range of the ATU-R receiver. Each downstream power cutback of 2 dB should correlate with an upstream increment 1.5 dB, otherwise the power at the ATU-R receiver will not be monotonic. TD-28 suggests creating a new Study Point for this revision, which also applies to VDSL (see discussion below). In TD- 29, “Robustness of G.handshake by Reducing the Data Rate” (P. Reusens, Alcatel), G.handshake (G.hs) replaces the tone method of ADSL activation with a messaging method. G.hs should be simple to implement and use low power. Also, signaling redundancy is required in the presence of noise, AM stations, line anomalies (e.g., bridged taps) and distortion (when used splitterless). Reduction of the bit-rate is a simple matter, but a reliable method is needed in adverse conditions to guarantee a successful handshake. TD-29 also applies to the VDSL discussion. The TM6 Chair wondered why G.hs was being presented in ETSI after TM6 agreed in Antwerp that none of the activities within TM6 (HDSL, ADSL and VDSL) needed handshaking. Discussion revealed that some delegates understood handshaking as meaning negotiation between modems of a same type (ADSL for example) while others saw it as a negotiation between modems of different types (VDSL/ ADSL for example). Does the operator need handshaking when both ends of the line are owned? Is the network termination (NT) going to be provided by the network operator? A reflector was created to discuss resolution of some of these matters before the Vienna meeting in September. TD-13 (J. Cook, BT) contains requirements and an outline design for a splitter intended to combine ADSL with either ISDN or POTS on the same pair of wires. It starts from a UK perspective (impedance, line current) but the requirements are discussed in a wider European context and also in the light of recent developments. Delay distortion is presented in WD-11. Parts of TD-13 (on the splitter) were proposed to be included in the document on ADSL

42 Vol. 9.6 Copyright © CSR 1998 August – September 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS over ISDN. It is not clear if this is a design for the UK only. Some delegates felt that the specification of the splitter should not be made with pure impedances but with actual line situations. A working group was set up to resolve issues of the power spectrum density (PSD) mask. A number of European Telecom operators expressed their concern that G.dmt is moving away from T1.413 Issue 2. This concern is expressed in WD-13, a liaison to the Q4/15 Rapporteur and G.dmt and G.hs editors. VDSL B. Waring (Lucent) is the VDSL Rapporteur. VDSL DTS PART I, FUNCTIONAL REQUIREMENTS VDSL Part I (Functional Requirements) of the Draft Technical Standard (DTS) has gone through TM6 voting. This meeting discussed only current contributions. TD-41 (A. Kliger, Metalink Transmission Devices) challenges the payload relating to VDSL symmetric operations and suggests changing either the mask M1 or the S3/S4 definitions of payload. It concludes that a bandwidth of 20 mHz is essential to implement VDSL symmetric data rates higher than 20 Mbps. TD-20 (B. Porat, Savan Communications, and S. Peleg, Siemens AG) proposes as mandatory the definition of the symmetric rates S1 (6N/6N) and S2 (12N/12N) from the VDSL Functional Requirements document. The rates S3 (24N/24N) and S4 (36N/36N) would be optional, because capacity computations and practical considerations show that these rates add substantial complexity to the design. This contribution is valid for Carrier-less Amplitude Modulation Phase Modulation (CAP) / QAM (Quadrature Amplitude Modulation) or Discrete Multi-tone Carrier (DMT) solutions. TD-22, “A Presentation of the Cost of the Requirement for 500 µsec Impulse Protection” (K. Starnberger, Siemens AG and S. Peleg, Savan Communications), shows the size of the memory required to support the impulse noise requirements defined in the VDSL Functional Requirements. A previous contribution by DTAG (presented in Berlin in June 1997 as TD-15) showed that the impulse noise is below 200 µsec in most cases. Expanding the protection from 300 µsec to 500 µsec will add about 20% to the size of the digital components in the VDSL chip sets, considering the rates defined for VDSL transmission. TD-22 proposes to replace the 500 µsec impulse protection of the VDSL system as defined in the VDSL Functional Requirements Document with a 300 µsec impulse protection, in order to reduce system costs. It is not only the cost of the memory but also the cost of the powering of those memories that should be taken into account. TD-22 was allocated to SP (study point) 1-4. TD-27, “Definition of Required Splitter Parameters for VDSL and ADSL” (R. Van den Brink, KPN Research), proposes to first settle the issue of literal text for the most relevant splitter parameters, and then define requirements for an adequate VDSL splitter. Progress on the latter issue was impeded by the lack of a common view on functional requirements, design targets, and relevant parameters definition. Numerical values for several requirements were also proposed, but consensus must first be achieved on definitions and design targets. Delegates agreed to separate the principles of the splitter specifications from the actual numbers. This document was allocated to SP 1- 13. TD-27 is complemented by WD-01 (R. Van Den Brink and B. Van Leerdam, KPN Research). WD-01 offers values for the different splitter parameters applicable to ADSL and VDSL. TD-43, “VDSL White Noise Generator” (A. Kliger, Metalink Transmission Devices), suggests that the noise model for VDSL is too severe as it includes twice the white noise; the generator G3 and the generator G4 of the VDSL functional requirements should not be applied to the same test. TD-43 was allocated to SP 1-8. TD-4, “A New Analytical Method for NEXT and FEXT Noise Calculation” (presented by K. Foster, BT on behalf of the FSAN VDSL working group), introduces an improved method that avoids the pitfall of making an over-pes- simistic calculation of total noise contribution (such a calculation arises when assuming that all sub-groups of n interfering systems are using the worst n pairs in a multi-pair cable). More importantly, this method does not treat any sub-group differently, so there is only one way of making the computation. The computation is such that in various limiting or trivial cases, it converges asymptotically to the reduced state. Also it never predicts a lower noise level when more disturbers are added. The method is being used by the Full Service Access Networks (FSAN) VDSL subgroup in its consideration of Spectral Compatibility, and is based on and yields identical results to a method proposed by CSELT. The method proposed here, however, is perhaps easier to understand and simpler to calculate. The meeting indicated that the same noise model should be used on both sides of the ocean. This model was presented to T1E1 and received favorable comments. TD-4 was allocated to SP 1-8.

TD-12 (V. Oksman, Lucent Technologies) considers the impact of the transceiver input and output port return loss on VDSL link performance characteristics. The proposed method analyzes the impedance mismatch between the transceiver and the transmission line in a more common manner. It is transmission technology independent and takes into account all main impacts of impedance mismatch. TM6 agreed to create a new Study Point. TD-16, “PSD + Crest Factor is Not Sufficient to Specify Noise in Performance Tests” (R. Van Den Brink, KPN Research), states that the current VDSL performance test (from Part 1: Functional Requirements, Feb. 1998) puts requirements on the nature of the noise signals to be used in the performance test. It shows that in some cases different noise signals that all satisfy the VDSL constraints lead to different noise margins of the modem under tests of up to 3 dB. This means that a tighter specification of the noise signals is required. TD-16 was allocated to SP 1- 17. TD-17 (T. Kessler, Deutsche Telekom) states that unless power back-ff is applied to VDSL upstream transmission the bit rates of long-range systems are severely degraded. Therefore, in the upstream direction, power back-ff is absolutely necessary. This contribution describes different methods for power back-ff and gives insight into the behavior of the Power Spectral Density (PSD) and bit rates when the VDSL modems are equally distributed along the cable, e.g., when using a distributed cable topology. With different power back-ff methods, a match was attempted between the achievable bit rates of up- and downstream and the required bit rates. The calculations use the FSAN noise model, the new noise combination method for Far End Cross Talk (FEXT) and Near End Cross Talk (NEXT) and a realistic formula for estimating the bit rates (excluding losses due to duplexing schemes). TD-21 (B. Porat, S. Peleg, Savan Communications, and K. Starnberger, Siemens) proposes an algorithm for power back-off in VDSL systems based on frequency-division duplexing. The algorithm aims at reducing the power of each network termination (NT) transmitter such that the FEXT level at all Line Termination (LT) receivers in the system would be the same and equal to the FEXT level that would have existed if all systems were at a maximum distance from the LT. The algorithm is performed once during each LT-NT connection, upon startup. A Study Point will be created on the Living List, SP 1-18 (K. Jacobsen, Amati/ TI), to evaluate the power back-off algorithms which should be common to FDD (Frequency Division Duplex) and TDD (Time Division Duplex), with probable steps of 1 dB and a range of 30 dB. TD-19, “A Proposal to Cancel the Requirement for Loop Back Testing of the ATM TPS-TC (Transport Protocol Specific-Transmission Convergence) by PLOAM Cells.” (S. Peleg, Savan Communications and K. Starnberger, Siemens EZM Villach), shows that this requirement, as defined in the VDSL Functional Requirements [1](TS 101 270-1, section 13.1.5), is redundant and unnecessary. TD-19 proposes that it be canceled since it is an extra function that is performed by other layers and introduces unnecessary complexity to the design. TM6 delegates agreed to discuss this issue at the forthcoming joint TM3/TM6 meeting in Vienna in September. TD-11 (V. Oaksman, Lucent Technologies, VDSL Coalition, and K. Starnberger, Siemens) proposes the activation and deactivation procedures both for the VDSL transceiver and the VDSL link controlled over VDSL Operation channel. The document is based on ANSI T1E1.4/98-046 and ETSI DTS/TM-06003-007 (i.e., CAP/QAM).

TD-18 (S. Peleg, Savan Communications and K. Starnberger, Siemens AG) is a proposal to change the core activation and deactivation state diagram that is found in the VDSL Functional Requirements. P. Reusens (Alcatel) indicates that this a generic diagram; he is the owner of this new Study Point SP 1-19. TD-30, “Flexible Frequency Plan for G.hs, Compatible for Both ADSL and VDSL” (P. Reusens, Alcatel), notes that G.handshake (G.hs) is intended for use by all ADSL variants (above POTS, over ISDN, ADSL-lite, etc.) and potentially for VDSL. A simple frequency allocation can be used by all ADSL variants, and by VDSL. By using a simple signature, the CO equipment marks its variant. At the remote location, a multi-mode modem (ATU-R or VTU-R) can inter-work with all variants of ADSL (and potentially with VDSL) at the CO. If incompatible modems try to initialize, the incompatibility will be recognized. WD-5 (L. Humphrey, Nortel, and K. Foster, BT) proposes that ETSI TM6 add new Study Points to the next revision of the “VDSL Functional Requirements Part 1”. The proposed additional SPs are: transport of narrow band, in-band, Internet Protocol (IP) transport, campus reference models, rate adaptation, and flow control. Delegates agreed to group these points into a single Study Point. VDSL PART 2, ELECTRICAL REQUIREMENTS TD-10, “VDSL Payload Rates for Symmetric Services” (V. Oksman, Lucent Technologies), proposes an approach to VDSL link transport capacity specification independent of the line coding and modulation technology. It provides interoperability and effective usage of VDSL payload for symmetric applications, the main component of which is

Synchronous Digital Hierarchy (SDH). TD-10 was allocated to SP 1-5 on symmetrical rates and SP 2-4 on Payload rates, because the rates may not be in agreement with those in TM3 and ITU-T G.707.1 (Network node interface for the SDH). WD-7, “VDSL Payload Data Rates” (T. Stefansson, Telia Research), is allocated to SP 2-4 as well. WD-7 raises a number of questions such as payload granularity, maximum payload rates, asymmetrical rates, and evaluation rates in both T1E1 and ETSI. TD-07 (K. Jacobsen, Texas Instruments) summarizes the results of two ADSL/VDSL spectral compatibility studies; it also presents some new results. One study (presented at the ETSI TM6 meeting in Verona, Italy, Nov. 1997) examined the impact of VDSL on ADSL when the two reside in the same binder; a second (presented at the ETSI TM6 meeting in Madrid, Spain, January 1998) examined the impact of ADSL on VDSL. It was shown that the effects of ADSL and VDSL on each other are dependent on both the loop configuration and signal bandwidths. TD-07 makes recommendations for VDSL start frequencies for different network configurations based on the spectral compatibility results. TD-32 (M. Isaksson, D. Bengtsson, and T. Stefansson, Telia Research) states that as much as possible of the lower frequencies are available to VDSL to give sufficiently long reach. The two VDSL scenarios, FTTEx (VDSL to the exchange) and FTTCab (VDSL to the cabinet), have different requirements for spectral compatibility with ADSL. In the former, VDSL is desired to have as long a reach as possible and the ADSL downstream band can be used for VDSL downstream transmission without affecting ADSL modems more than other ADSL modems. In the FTTCab scenario, it is possible for VDSL to disturb ADSL if ADSL runs from the exchange, but the VDSL downstream power over the ADSL band can be lowered to a level which assures no interference with ADSL. TD-42 (A. Kliger and A. Shabtay, Metalink Transmission Devices) analyzes the performance of different asymmetric VDSL services under different FEXT models; different services coexisting on the same cable (Mixed FEXT) are compared to a case where all services in a cable are of the same type. TD-42 shows that in all cases, mixed FEXT degrades VDSL performance; degradation of TDD schemes is significantly greater (FDD suffers significantly less than TDD independent of the code). Some of the degradation can be regained using a complicated on-line transmit power adaptation. TD-42 recommends including a mixed FEXT noise configuration in the VDSL test noise models. TD-31, “VDSL Deployment, Services, and Customers - Part 1: Mixing of Symmetric and Asymmetric Services on the Bundle-level” (P. Ödling, Telia Research), points out that network planning of a VDSL deployment is an issue of increasing urgency, especially in terms of what an operator actually can offer its customers. Zipper-VDSL (proposed by Telia and SGS Thomson) is the basis of some possible deployment strategies. In particular, it addresses some issues associated with different customers requesting different services. Three Study Points were created relating to power spectral density and deployment; each SP is owned by a Telecom Operator representative: • Modification of the PSD mask (K. Foster, BT) • Mixing services and impact on noise models (L. Magnone, CSELT) • Planning rules, scenarios (M. Vautier, France Telecom) TD-34 (T. Pollet, M. Peeters, and P. Reusens, Alcatel) is Part I of a proposed method for Dynamic Power Save (DPS) in ATM based xDSL modems that can be applied to VDSL as well as to ADSL modems. TD-34, which focuses on ATM-specific requirements, proposes a method to detect idle cells in an ATM network based xDSL modem, to reduce the size of the constellation, and to reduce power dynamically in the case of transmission of idle cells. It also shows the resulting power spectral savings. TD-26 (T. Pollet, M. Peeters, and P. Reusens, Alcatel) accompanies TD-34 as Part II and focuses on the Physical Media Dependent Layer (PMD). TD-26 proposes a line code independent method for Dynamic Power Save (DPS) in ATM based xDSL modems that can be applied to VDSL as well as to ADSL modems. The method imposes functional requirements on both the Transport Protocol Specific (TPS)-Test Case (TC), Part 1 and Physical medium- specific (PMS)-TC/PMD layer, Part 2. The strength of this method is that only minor changes to the current ADSL standard are needed to implement it. Moreover, it can easily be made backward compatible with ADSL. TD-9 (V. Oksman, Lucent Technologies on behalf of the VDSL Alliance[DMT] and the VDSL Coalition [CAP/QAM]) proposes a specification for the Asynchronous Transfer Mode-Transmission Convergence (ATM-TC) which describes the ATM-based service transmission over a VDSL system. The document defines a minimum set of requirements to deliver an ATM service from the Optical Network Unit (ONU) to the remote customer premises (CPE). The proposed method is universal for both ONU and CPE; these are independent of line coding as well as

August – September 1998 Vol. 9.6 Copyright © CSR 1998 45 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATION modulation technology. It is based on ITU Recommendation I.432.5 (B-ISDN User-Network Interfaces - Layer 1 Recommendations). TD-6 is the latest draft of the VDSL Alliance’s Synchronized Discrete Multitone (DMT) proposal for VDSL. The proposal specifies both a time-division duplexed (TDD) and a frequency-division duplexed (FDD) system. In both cases, symmetric and asymmetric transmission are supported. Support of 1:1, 2:1, 3:1, 4:1, 6:1, and 8:1 transmission is mandatory, as is rate adaptivity at start-up. Support of ATM is also required. Comments about this proposal are invited and should be directed to the editor (K. Jacobsen, Texas Instruments). TD-8, “VDSL Coalition Draft Specification (Version 5)” (V. Oksman, Lucent), is the current working version for systems using single-carrier technologies (CAP and QAM). The specification takes into account general VDSL systems requirements from ANSI T1E1.4/98-046 and ETSI DTS/TM-06003-007. The system will support nominal downstream data rates with both symmetric and asymmetric upstream rates. Intermediate data rates are also provided to ease trade-off between data rate and reach. The document specifies coding and modulation methods which provide full interoperability between CAP and QAM transceivers. For VDSL Part 2 (electrical requirements), TM6 delegates agreed to a new table of contents as well as a continuation of work with a dual part 5 containing both the multi-carrier modulation system and the single carrier systems. ISDN-BA In the process of updating ETR 080, “Transmission and Multiplexing; ISDN basic rate access; Digital transmission system on metallic local lines,” only one point remained under study, SP-11, which deals with Power Spectral Density both for 2B1Q and 4B3T. The objective was to tighten the spectral density so as to protect ADSL in parts where the ISDN basic rate access was not specified; solutions were agreed upon at the Rapporteur’s meeting in Hilversum (May 26, 1998). TD-5 (A. Carrick, Ascom AG) presents measurement results for tests in accordance with the proposed Power Spectral Density (PSD) mask and “Sliding Window” mask for a 2B1Q ISDN-BA system described in version 8 of the Living List for TS 101 080. Various measurement difficulties are indicated, but the overall conclusion is that the proposed requirements are feasible, and hence SP-11 could be moved to agreed. TD-40, “ISDN-BA Power Spectral Density Results Based on the Sliding Window Method” (L. Magnone, CSELT), gives measurement results from different manufacturers of ISDN-BA PSDs. TD-5 and TD-40 agree that the new proposed masks can be met with existing basic rate ISDN access implementations. TM6 delegates agreed to close SP-11 and to prepare for publication of the revised ETR 080. WD-3, “Changes Made in TS 101 080 after Antwerp, April 24,” introduces the editorial changes brought to ETR 080 and proposes their complete acceptance. The Living List was closed for basic rate ISDN access; TM6 Chair will handle the day to day questions on that Work Item. HDSL

ISSUE 5 OF TS 152, ISDN TRANSPORT S Schmoll (Alcatel) reported that the rapporteur’s meeting held in Stuttgart resulted in the proposal to separate the transport of ISDN and the transport of POTS which is much simpler (no need for clock transport in the case of POTS). The justification procedure was preferred to the pointer solution to solve the problem of the ISDN basic access clock that needs to be carried through the HDSL link and the HDSL clock which is independent of the ISDN clock. Synchronization. The synchronization character selected is a 7 bit Barker code. TD-14, Comments on Living list for RTS/TM-06009 (HDSL_5) (A. Carrick, Ascom AG), notes that Study Point 1 of the living list for work item RTS/TM-06009 entitled “Investigation of means for the simultaneous transport of POTS or ISDN-BA and high speed data” calls for “agreed status” to be reached at this meeting. It is, however, the opinion of Ascom that the text has not been stable long enough for this to be achieved. Ascom therefore proposed that the status be maintained at “Provisionally agreed” until the Vienna meeting, and then, if no changes of substance have been made and no contributions registering objections have been received, the status would automatically move to “Agreed” without any further discussion.

A. Carrick remarked that there are other ways to transport the ISDN signal for a CAP-based HDSL system which could carry the ISDN BA signal in the lower part of the spectrum. For instance, one could carry four B channels in a CAP system, two in band and two outside the HDSL spectral allocation. TD-35 (K. Ko, Rockwell Semiconductor Systems) raises another issue of the incompatibility between the HDSL specification for micro interruption (10 ms) and the ISDN-BA specification for the same micro interruption. This came up in a proposal for the combined transmission of HDSL and ISDN which was provisionally agreed at the Stuttgart Rapporteur’s meeting. A discussion followed while the TM6 Chair tried to determine how serious the problem was. TM6 delegates agreed that if no contributions are received within a month, the problem will be deleted. TD-37 (C. Heidelberger, Schmid Telecom) proposes editorial changes to subclause 7.7.3.2 (mapping of the ISDN- BA to the core frame) and 7.7.5.3.4 (clock synchronization for ISDN-BA) of HDSL (MI/TM-06 009). It was not discussed during the plenary meeting but in a seclusive rapporteur’s meeting (not publicly announced). Some errors were found in the document submitted for delegate approval. A majority of TM6 delegates felt that issue 5 of TS 152 was not stable enough to be agreed at this (Luleä) meeting and the resolution proposed by Ascom was accepted. In conclusion, Issue 5 of TS 152 on HDSL was not approved for publication. SINGLE LINE DSL (SDSL) SDSL is a new work item to define a mostly symmetrical digital subscriber line with extended capability with respect to the existing HDSL. The TM6 Chair viewed this session as a “brainstorming session” since it is a new topic and invited operators to describe their requirements for a single pair symmetric digital subscriber line (SDSL). TD-3 (A. Tannheuser and G. Liesenfeld, Siemens) presents proposals for the functional requirements of the SDSL reference configuration concerning broadband and POTS or broadband and ISDN-BA communication. J. Besseyre (Consultelecom) suggested that it would be preferable to first determine the functional requirements, then hear proposed solutions to resolve the problems. TD-23 (M. Sorbara, GlobeSpan) suggests a framework to organize SDSL functional requirements; this would constitute the table of contents of a Part 1 SDSL document. TD-24 (J. Quilici, Level One Communications) recognizes that the single pair 2B1Q and CAP based systems, currently defined in ETR-152, adversely affects the performance of ADSL. Spectral shaping can be used to improve this situation. Overlapped PAM Transmission with Interlocking Spectra (OPTIS) utilizes a shaped PSD template to provide sufficient performance margin in the presence of ADSL, while also minimizing degradation to ADSL performance. This contribution presents a new OPTIS PSD template, which has been improved for spectral compatibility to ADSL. Performance and spectral compatibility is compared to single pair 2B1Q and CAP based systems. This work demonstrates how the use of a shaped PAM modulation may be used to optimize the PSD template for spectral compatibility to ADSL. A number of questions asked from the floor were not answered; the optimization done by OPTIS for the North American environment is not immediately applicable to the European environment; a line code on one side of the ocean needs more than upgrading the clock to operate properly in Europe. G. Zimmerman (PairGain) gave a two hour tutorial on OPTIS ouside the formal TM6 meeting. TD-25, “Functional Requirements on SDSL” (T. Stefanson, Telia), presents the position of Telia regarding the development of SDSL. TD-25 proposes starting with a definition of functional requirements and following in the steps of VDSL. TD-33 (A. Ihre, Deutsche Telekom) provides some functional requirements which ETSI/TM6 should address when specifying SDSL transmission systems. It defines the payload for SDSL corresponding to applications as well as transported channels; no rate adaptability is needed. The SDSL solutions must work in the noise environment. TD-36 (C. Heidelberger, Schmid Telecom) notes the present shortcomings of the ETSI noise model and proposes a framework for establishing a new one, taking into account ADSL, VDSL, HDSL, HDB3 and SDSL systems. S. Schmoll (Alcatel) is the rapporteur of the SDSL work item; he will keep all contributions done on requirements and noise model for possible input into the document. TD-38, “Use of Coded Modulation for Sub-E1 Data Rates” (M. Kimpe, Adtran and J. Hausner, Siemens), discusses the use of trellis coded modulation with some examples of sub-E1 data rates. Simulation results show that reach can

be increased up to 825 m relative to uncoded 2B1Q transmission. This additional reach enables 400 kbit/s systems to have approximately the same reach as 2B1Q based basic rate ISDN. Although most of this gain can be achieved by using relatively low complexity codes, the complexity of the decoder is doubled, after a point, for each 21 m gained. The decoder can then easily dominate the total receiver complexity and power consumption. TD-39, “A low power PSD for HDSL2/SDSL Applications” (M. Kimpe, Adtran and J. Hausner, Siemens), notes that, referenced to the line side of the transformer, the maximum peak-to-peak voltage for HDSL2 is nearly 20 V, compared to less than 6 V for 2B1Q HDSL. For ANSI DS-1 applications, this level of power consumption is likely to prevent the deployment of span-powered regenerators. Because of this, at the last T1E1.4 meeting, T1E1.4/98-221 introduced an alternative reduced power PSD for applications involving regenerators. TD-39 proposes a similar approach to meet the low power requirements of ETSI SDSL.

WD-6, “Requirements for SDSL in Austria” (M. Gindel, FZA), is a good input to the functional requirements for SDSL. WD-9, “Requirements for SDSL in UK” (K. Foster, BT) does the same for UK; it includes reach targets of >3 km of 0.4 mm cable at 2.048 mbit/s (business application) and >7 km of 0.5 mm cable at 384 kbit/s (residential application). WD-10, “Requirements for SDSL in Finland” (P. Poikolainene, Helsinki Telephone Corp.), does the same for Finland; it shows in particular the need for symmetrical low bit rates for Internet servers of SOHO and residential users who desire higher upstream data rates than ADSL can support. Jacques Besseyre, Consultelecom

REPORT OF Q3/16 T120 RAPPORTEURS MEETING JUNE 22 – 26, COLORADO SPRINGS, CO

B. DeGrasse (BJ Communications) is the Q3/16 Rapporteur. T120-221 is the meeting report. Documents for this meeting can be found on the Q3/16 T120 ftp site at: ftp://ftp.imtc-files.org/imtc-site/T120-top/t120_colorado98 Members are asked to distribute papers electronically for review one week in advance of a meeting to the designated subdirectory ftp://www.imtc.org/imtc-site/T120-top/incoming. Availability of the files should be announced by e- mail. Document numbers can be retrieved from the rapporteur. New drafts should have their revision date hard- coded, so that it will print the same for all members. Attendees were encouraged to review the documents on their laptops at this meeting rather than requesting hard copy. Electronic mail should be sent to members via the reflector at [email protected]. For instructions to join or unsubscribe to this mailing list, send email to [email protected]. T.120 SECURITY REQUIREMENTS T120-216-e, T.123 Annex B: Extended Transport Connections (P. Murphy, DataBeam), contains a method for using X.224.0 (OSI protocol for providing connection-mode transport service) to allow negotiation of extended T.123 transport connection services that may include security procedures. Security options currently specified in this procedure are X.274 (transport security protocol), SSL/TLS (secure sockets layer) and Ipsec (IETF IP security, below the transport layer). T120-212, X.274 Extension to T.123 Annex B (M. Euchner, G. Volkmann, Siemens), discusses usage procedures for X.274 as it relates to T.123 security. Two procedures were identified when X.274 is to be used by T.123; one where the attributes of security association have been established by some out-of-band means, and the other where the attributes do not exist and a security association protocol must be executed. Changes to ASN.1 in T120-216-e were proposed and accepted to permit and identify these two conditions. It was decided that the negotiation procedure would be documented as an annex to T.123. In addition to the inclusion of the annex, changes to T.123 would be made to the scope and summary as well as other housekeeping sections. Other changes include the addition of a note from the implementers guide and the addition of unreliable extended transport stack. These revisions to T.123 are expected to be submitted for Determination at the September 1998 SG16 meeting.

Other decisions and actions include: • Inclusion of physical security as selectable type • The set of security selections was determined to be complete for now

• The addition of an unreliable stack • Call back will not be added • No new alias type for telephone numbers (pack instead) • The implementers guide will have a description on how to use alias addresses through firewalls • SecureConnection field will be added to T.122/125 (MCS service definition/protocol specification) at the first opportunity T.124 CONFERENCE SECURITY T120-217-e, T124 Security Version 03 (F. Lelong, France Telecom), comments on security weaknesses in T.124 conference establishment and proposes some possible changes to make it more secure. It assumes that threats can come from T.120 non-regular stacks, threats can come from nodes that are already members of the conference, and that the top provider is a trusted node. This document recommends changes for conference create, join and invite. It was agreed that this difficult problem needs additional study. T.120 REMOTE DEVICE CONTROL A liaison statement (T120-213) from Q14/16 contains a list of recommendations to Q3/16 regarding remote device control. The list recommends: • A common message format for T.RDC (real-time device control) and H.RDC • That the current T.RDC be the base document for RDC formats (changed to V.RDC) • Changes to incorporate H.281 (FECC operation) like signaling • A T.RDC and H.RDC be created for use with T series and H.3xx series protocols • Q14/16 to add H.RDC to H.245v5. The suggested schedule for these recommendations is Determination of V.RDC and T.RDC in Sept 1998 and H.RDC in April 1999. T120-218, Proposal for Common RDC Protocol (M. Duckworth, PictureTel), proposes work items to accomplish the recommendations in T120-213. An edited version was attached to T120-121, the meeting report, as Appendix 1. It contains a detailed work plan for RDC activity. T.120 MEETING ROOM MANAGEMENT T120-214-e, Draft Recommendation T.MRM, Meeting Room Management (J. Boucher, BT), contains a proposal for management of virtual meeting rooms. It describes extensions to the GCC functionality to support the management of audio and data services for the virtual meeting rooms. Each room may have a set of rules relating to participation, roles and facilities. Roles discussed in the proposal include chair, presenter, audience, secretary and operator. Management primitives were presented for creation, entering, admission, expelling and association of the meeting room and its facilities. A set of framework parameters was proposed. They include restriction level, max number of nodes, role permissions, descriptor list, audio mixing service and others. Appendix 2 of T120-221 (the meeting report) lists in detail the numerous changes resulting from discussions on this subject. T.123 PROFILES The addition of unreliable extended transport stack was discussed in detail and a proposal was agreed. This change will be included with T.120 Security changes. Discussion was held on ASN.1 vs. plain binary encoding for CNP (connection negotiation protocol, does the actual service negotiations). No decision was made; further discussions are expected at the next meeting.

WORK PLAN Table 1 summarizes the status the T.120 work areas.

Draft Rec. Status SG16 Sept 98 SG16 Apr 99 Comments T.120 D-1996 Annex C D-Feb 98 T.121 D-1996 T.122 Rev D-Feb 98 T.123 D-1996 Det-rev Dec T.120 Transport security, unreliable stack T.124 Rev D-Feb 98 T.125 Rev D-Feb 98 T.126 D-Mar 97 T.127 T.128 D-Feb 98 T.134 (T.chat) D-Feb 98 T.135 (T.res) D-Feb 98 T.MCS2 TBD Imp Guide Revise T.RDC Draft Det T series Remote Device Control T.MRM Draft Det Meeting Room Management

(Det= determine, r= re-determine, D, Dec= decide) Table 1. Status of T120 Recommendations and Work Areas.

Q3/16 RAPPORTEUR MEETING ROSTER, JUNE 22 – 26, 1998, COLORADO SPRINGS, CO Bruce DeGrasse, BJ Communications Q3/16 Rapporteur Host: MCI France France Telecom Franck Lelong [email protected] Germany Siemen AG Martin Euchner [email protected] Germany Tellique Dr. Jorg Ott [email protected] UK BT Labs John Boucher [email protected] USA BJ Communications Bruce DeGrasse [email protected] USA DataBeam Patrick A. Murphy [email protected] USA MCI Murry McEntire [email protected] USA Microsoft Jane Dailey [email protected] USA Microsoft Curt Smith [email protected] USA Nexus Systems Inc. Chuck Grandgent [email protected] USA PictureTel Mark Duckworth [email protected] USA PictureTel Kaynam Hedayat (by tel.) [email protected]

Communications Standards Review – Telecommunications regularly covers the following committee meetings:

TIA TR-29 Facsimile TR-30 Modems TR-41 User Premises Equipment ITU-T SG8 Telematic Terminals SG15 WP1 Network Access SG16 Multimedia ETSI ATA Analog Terminal Access DTA Digital Terminal Access MTA Multimedia Terminals TC SP Speech Processing TC STQ Speech Transmission Quality TIPHON Voice Over Internet TM6 Transmission & Multiplexing

August – September 1998 Vol. 9.6 Copyright © CSR 1998 51 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATION REPORT OF THE Q11/16 CIRCUIT-SWITCHED NETWORK (CSN) MULTIMEDIA TERMINALS AND SYSTEMS EXPERTS MEETING, JULY 21 – 23, 1998, WHISTLER, BRITISH COLUMBIA, CANADA

Technical editor’s note: To minimize overlap, sections of this report which duplicate the Q15/16 report (below) have been deleted. Please see the Q15/16 report for more details. Items discussed at this meeting included the additions of H.263 (1998) in H.320; review of proposed draft H.223 Annex D; inclusion of MPEG-4 in H.324 and H.245; and video enhancements for better error robustness in mobile environments. The meeting report is Q11-G-20d2. Documents for this meeting, for other meetings, and other information pertinent to the activities of the CSN Experts Group can be found on the Q11/16 ftp site: ftp://standard.pictel.com/lbc-site Documents for this meeting are in the Whistler.July98 subdirectory. Members were reminded to make disclosures of known patents to the ITU Secretariat as defined in a timely manner. The ITU Patent Policy and related information URL is: http://www.itu.int/ITU-Databases/TSBPatent/ MOBILE

R-S CODE SUPPORT IN H.223/ANNEX D Q11-G-09, Proposed draft text for H.223 Annex D (H. Tanaka, Toshiba), presents an optional coding algorithm for error-protection in H.223 Annex C (RCPC codes). The group suggested several editorial changes for clarity. Q11- G-09r1 will be submitted to SG16 for Determination in September. Reporter’s Note: During review of this document, an editorial error was noted in H.223 Annex C section C.4.1.7.2, second sentence should be “AL-SDU*” (not “AL-PDU”). This will be added to the corrigenda document for H.223 to be approved at SG16. Q11-G-10, Proposed H.245 (control) Additions to Support H.223 Annex D Operation (H. Tanaka, Toshiba), was presented; the group agreed that it would be submitted to the H.245 Senior editor for presentation at the SG16 meeting. INTERFACES BETWEEN H.223 AND VIDEO Q11-G-14, Current and Future Interfaces for H.324M and Video H.263/L (B. Wimmer, Siemens; H. Tanaka, Toshiba; T. Stockhammer, TU Munich), gives an overview of what is possible with the current standard H.324 An- nex C (mobile) and what else could be provided in the future by applying advanced error protection methods inside the multiplex layer. It was noted that only Siemens and Toshiba are currently working on this effort; they solicit inputs and support from additional members. Further discussion was deferred to the joint Q11/16-Q15/16 meeting. MULTIMEDIA SERVICES IN IMT2000 No contributions on IMT2000 were available at this meeting. The group noted that there is work going on in ETSI on Multimedia Services in IMT2000, but there is no agreement that video services will be included in UMTS. (The work in ANSI/TIA is not considering video services at this time.) Further work on this subject will be added to the Mobile Ad Hoc. Q11-G-19, a Liaison from ITU-R TG8/1 (same as Q15-E-47), was reviewed. It was agreed to generate a liaison to SG2, SG11 and ITU-R TG8/1 at the SG16 meeting, informing them of the status of the Q11/16 work. It will request the latest time frames that input from Q11/16 could be considered in their respective systems definition. MPEG-4 IN H.324 MOBILE TERMINALS Q11-G-15, MPEG-4 over H.324 (A. Rulfs, F. Seytter, B. Wimmer, Siemens), provides an interface between MPEG-4 DMIF and the underlying H.324 transmission standard. Questions were raised regarding profile definitions and management. With the commitment of several companies to support the work, it was agreed that this proposal would be placed under study and will be considered in future Q11/16 meetings.

JOINT MEETINGS OF Q11/16 AND Q15/16

MPEG-4 IN H.324 TERMINALS Q11-G-16/Q15-E-27, a liaison from ISO/IEC JTC1/SC29/WG11 concerning MPEG-4 Video over H.324, was presented by the MPEG designated Liaison, Y. Kikuchi. It was noted that the first step is only to include a subset of the MPEG-4 visual standard and any further integration requires a second step. There is work in an ad hoc in MPEG working on mobile support in DMIF for MPEG-4 version 2. Q11-F-07r1 (“Support of MPEG-4 in H.324,” T. Kawahara, NTT DoCoMo) was utilized to explain some of the questions raised concerning codepoint definitions. It was noted that the complete list of IP holders would not be available until the current standard is approved. Q11-G-11 (Toshiba plus 5 companies) explains new applications for MPEG-4 visual over H.324 terminals. Several demonstrations of the capabilities of the proposed MPEG-4 object-based coding were presented. Q15/16 Experts noted that there has been no demonstrated error resiliency using MPEG-4 in H.324 to date. However they acknowledge that shape coding does address capabilities that have not been addressed to the same degree in prior standards. There was no consensus reached for a recommendation regarding acceptance of MPEG-4 in H.324 at this meeting; further discussions, as agreed in Cannes, will occur in Geneva. TEST MODEL FOR ERROR RESILIENCE S. Wenger (TELES AG/TU Berlin) reported on the Video Enhancements ad hoc group. There has been progress on the test model for error-resilience. During a break-out session to further work on this subject, the Q11/16 and Q15/16 experts mainly discussed the error-resilient test model (H.223/M) that is required by Q15/16 to verify new error resilient proposals. This test model reflects the entire system stack beyond the video codec. Q11-G-12, Unequal Error Protections (UEP) for H.263 Video Using RCPC Codes (B. Wimmer, Siemens; T. Stockhammer, TU Munich), was reviewed. Q11-G-14, Current and Future Interfaces for H.324M and Video H.263/L (B. Wimmer, Siemens; H. Tanaka, Toshiba; T. Stockhammer, TU Munich), was also reviewed. The groups agreed on the following models: 1. Test model that simulates a point-to-point connection with FEC, however no retransmission of erroneous multiplex frames and no backward channel capability is supported. 2. Test model, which supports both a point-to-point connection with FEC and backward channel functionality, however no retransmission capability. 3. Test model that reflects an entire H.223/M stack with point-to-point communication including FEC, backward channel and retransmission capability. All test models can be adjusted to particular configurations of video, audio and system streams. It also allows use of different bit error files that simulate different kinds of wireless transmission channels and transmission conditions, e.g., speed. The group identified several video streams, including the appropriate coding options and several error patterns. These parameters are collected in a document written by S. Wenger. Due to the different complexity, the groups agreed that only model 1 shall be used at the beginning. However, it is also desirable to make the other models available to the groups. During discussion, the ad hoc chairman B. Wimmer identified the lack of support for this test model by the mobile group. Only the Technical University of Munich together with Siemens proposed to support that work; a test model software might be available from those parties. The group expressed its need to have a software for model 1 available by the end of September. Q11/16 WORK PLAN The status of Q11/16 Recommendations is shown in Table 1.

The following Ad Hoc committees were approved and will continue until the next meeting (See Q11-G-20d2, Appendix I for rosters and charters): Ad Hoc Chair System M. Nasiri (Ericsson) Mobile B. Wimmer (Siemens) Non-Conversational Svcs C. Quist (KPN) H.263+ in H.320 S. Gupta (VTEL) Interoperability Testing (Mobile terminals) M. Luomi (Nokia)

Recommendation Determination Decision/Approval Comment H.324 Annex F 9/98 White submitted 5/8 H.226 (H.multilink) 9/98 White submitted 5/8 H.324 Annex D I/G 9/98 H.320 (Revision) 9/98 3/99 H.221 (Revision) 9/98 3/99 H.230 (Revision) 9/98 3/99 H.242 (Revision) 9/98 3/99 H.223 Annex D 9/98 3/99

Table 1. Status of Q11/16 Recommendations.

Q11/16 EXPERTS MEETING ROSTER, JULY 21 – 23, 1998, WHISTLER, BC, CANADA Tom Geary, Rockwell Q11/16 Rapporteur Hosts: TELES AG, Germany University of British Columbia, Vancouver, Canada

Finland Nokia Ari Hourunranta [email protected] Germany Robert Bosch Peter Vogel [email protected] Germany Siemens AG Bernhard Wimmer [email protected] Japan Toshiba Corp. Yoshihiro Kikuchi [email protected] Japan Toshiba Corp. Hirokazu Tanaka [email protected] Sweden Ericsson Goran Roth [email protected] USA Rockwell / U.S.A. Tom Geary [email protected] USA Toshiba Corp. Barry Aronson [email protected] USA VTEL Smita Gupta [email protected]

54 Vol. 9.6 Copyright © CSR 1998 August – September 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS REPORT OF THE ITU-T Q15/16 VIDEO CODING EXPERTS GROUP JULY 21 – 24, 1998, WHISTLER, BRITISH COLUMBIA, CANADA See also the Q11/16 report (above). The Q15/16 Rapporteur is G. Sullivan (PictureTel). Joint sessions were held with the experts of the ITU-T Circuit- Switched Network Terminal Systems Experts Group (Q11/SG 16). Documents for this meeting, for other meetings, and other information pertinent to the activities of the Video Coding Experts Group can be found on the Q15 ftp site managed by the Rapporteur: ftp://standard.pictel.com/video-site Documents for this meeting are in the 9807_Whi subdirectory of the ftp site. E-mail conversations pertaining to the activities of this group are routinely conducted using the e-mail reflector managed by M. Zeug (Iterated Systems). To subscribe or unsubscribe to this e-mail reflector, submit a request to: [email protected] The address for e-mail to be sent to all members of the email reflector list is: [email protected] Advanced electronic distribution of contributions will continue to be the Q15/16 policy, with an intent to continue to reduce and eventually eliminate the need for paper copies at these meetings. At this meeting, late, unannounced contributions hand-carried to the meetings were accepted only with the consensus of the meeting participants. A LAN was provided to give instant access to electronic meeting contributions throughout the meeting room (as well as mains power throughout the room and an internet service connection). AD HOC COMMITTEE REPORTS Reports were presented for seven of the eight Ad Hoc Committees that were established at the previous meeting (Table 1). LIAISONS A liaison was received from ISO/IEC JTC1/SC29/WG11 (MPEG) (Q15-E-28) noting their concerns at the length of time between approval of common text documents and the availability of published documents. Particularly noted were H.222.0 (ISO/IEC 13818-1) and H.262 (ISO/IEC 13818-2). This will be addressed at the September SG16 meeting. DEPLOYMENT AND SUPPORT OF H.263 AND H.263+

H.320 ADOPTION OF H.263+ ENHANCEMENTS Q15-E-06/Q11-G-03 (S. Gupta) is the ad hoc report on the adoption of the H.263+ (H.263 1998) enhancements into the H.320 (circuit mode video conferencing over digital channels) suite. The following are drafts of the affected sections of the standards: Q15-E-18 (P. Luthi, PictureTel) H.320 Table 7 and Annex A Q15-E-33 (S. Gupta, VTEL) H.221 (frame structure) Table A.1 and Annex A.3 Q15-E-34 (S. Gupta, VTEL) H.320 Section 3.1, Tables 2 and 4 Q15-E-35 (S. Gupta, VTEL) H.242 (start-up procedures) Section 5.2, Table 6, Appendices VI, VIII and IX

The Q15 experts were pleased with the progress of this activity. The draft documents were reviewed by the Q11/16 experts and were refined in minor ways (all editorial). The revised documents were provided as “r1” versions of the input documents, and are considered consensus output documents. Further work on this issue will be conducted primarily by the Q11/16 experts group.

Ad Hoc Committee Chairperson Report H.263+ Bitstream Packetization T. Gardos (Intel) Q15-E-04 Video Coding for Sign Language and Lip Reading G. Hellström (Omnitor) None Available H.263+ in H.320 S. Gupta (VTEL) Q15-E-06 Error Resilience Simulation Conditions S. Wenger (TELES AG) Q15-E-07 Compatibility Between MPEG-4 and H.263 G. Sullivan (PictureTel) Q15-E-08 Test Model Enhancement and Software Development K. Hibi (Sharp) Q15-E-09 H.263++ Development G. Sullivan (PictureTel) Q15-E-10 H.26L Development K. Hibi (Sharp) Q15-E-11

Table 1. Ad Hoc Committees Reporting to Q15/16 July 21-24, 1998.

MPEG-4 ADOPTION OF H.263 (BASELINE) COMPATIBILITY Q15-E-08 is the ad hoc committee report on MPEG-4 compatibility with H.263. H.263 compatibility was adopted into the Final Committee Draft of MPEG-4 at the Tokyo meeting in March. Successful software integration and refinement of the text description was reported in Dublin in April. The remaining work seems to consist only of double-checking the text and software, and continuing to verify the software through bitstream exchanges. JOINT Q15/16 AND Q11/16 MEETING

DISCUSSION ON MPEG-4 IN H.324 PROPOSAL At its April meeting in Yokosuka (see report in CSR-T 9.4, May-June 1998), Q11/16 received a proposal for the adoption of the draft MPEG-4 visual coding standard into the H.324 suite, and asked the Q15/16 experts at the April meeting in Tampere (see report in CSR-T 9.4, May-June 1998) if they could provide advice as to whether there was significant justification for inclusion of this additional visual codec in H.324. Q11/16 has held another meeting since Tampere, at which they decided to defer a decision on this proposal to the SG16 meeting in September in order to provide ample opportunity for comment and evaluation. MPEG also held a meeting since Q15/16 met in Tampere, at which they responded to the Q11/16 and Q15/16 inquiries on this topic in a liaison statement reply (Q15-E-27). The MPEG-4 experts believe that the major benefits of using ISO/IEC 14496-2 (MPEG-4) in H.324 systems will be the new tools available: e.g., multiple arbitrarily shaped video objects, 12-bit video, scalable texture coding, animation, and virtual reality. The following documents were provided as liaisons: • Q15-E-38, MPEG-4 profiles/levels summary • Q15-E-39, intellectual property management and protection overview (this describes content control mechanisms) • Q15-E-40, MPEG version 1 overview • Q15-E-41 MPEG version 2 visual working draft Further information on MPEG work items and meeting schedules is available at: http://drop.cselt.it/mpeg Q15-E-42-e, New Applications for MPEG-4 over H.324 Terminals (Y. Kikuchi, Toshiba; T. Kawahara, NTT DoCoMo; H. Harasaki, NEC; Y. Machida, Matsushita; R. Talluri, Texas Instruments), and Q15-E-43, MPEG-4 over H.324 (A. Rulfs, F. Seytter, B. Wimmer, Siemens AG), show substantial support for the adoption of MPEG-4 visual into H.324; a demonstration of the capabilities of the MPEG-4 visual draft was provided. The features of MPEG-4 which are promoted by the advocates in these new contributions are primarily those most unique to MPEG-4 visual (e.g., object-oriented segmentation-based coding and the coding of synthetic visual content such as animation and virtual reality). MPEG-4 contains some features which are not addressed in prior ITU or ISO/IEC visual coding standards. The demonstration of the visual capabilities most unique to MPEG-4 and the support shown at this meeting for wanting these features in H.324 were noted and appreciated by the experts. The experts felt that Q11/16 may now have sufficient information to decide on the desirability of these features for H.324 at the September SG16 meeting. The two contributions propose the adoption of MPEG-4 visual in two quite different forms. Q15-E-42-e proposes adoption of the visual standard part of MPEG-4 as a visual codec to be operated separately from the rest of the MPEG-4 framework. Later, an adoption of additional features and/or versions of the MPEG-4 suite would be anticipated as well in future revisions of H.324/H.245. Q15-E-43 proposes the adoption of the DMIF (DSM-CC Multimedia Integration Framework) mechanisms of MPEG-4 in order to harness the full power of the MPEG-4 suite

(including BIFS, MPEG-4 term for Binary Format for Scenes, for example) rather than adopting the visual codec as a stand-along feature. The second form of adoption provides greater capabilities and avoids the need for later updates of H.245 to accommodate each remaining individual feature or version of MPEG-4. H.245 draft syntax was provided for each proposal. Q15/16 expects further discussions regarding the possible form of any potential MPEG-4 feature- set adoption to take place in the future (along with the provision of further detail sufficient for a complete draft text definition). The experts are encouraged to study the issues for discussion (primarily as a Q11-14 issue) at the next SG16 meeting. PACKET AND MOBILE VIDEO NEEDS

Study of Error Effects on Existing Syntax Q15-E-04 (T. Gardos, Intel) reports the status of work on the definition of a packetization format for H.263v2 bitstreams. A third version (v3) was distributed May 7, 1998. On July 10, 1998 the chair of the IETF AVT (Audio Video Transport) group requested that the IESG publish it (draft-ietf-avt-rtp-h263-video-02.txt). It appears that the relevant approvals of an RFC in the IETF and a corresponding Annex to H.225.0 in SG16 are imminent. Q15-E-07 reports the status of work on the definition of error resilience simulation test conditions. Q15-E-12 (S. Wenger, TU Berlin) proposes a design for a “test model” method of carrying H.263 video over H.324M terminals for mobile applications. It contains recommendations on which optional modes of H.263 would be used, how these modes can be used, how the video can be packetized into AL3 SDUs for maximal error resilience, and how error handling in a decoder can be performed. The contribution contains recommended changes relative to the simulation conditions which were recommended as an experts group output document from the last meeting (Q15-D-64r2). Q15-E-13 (S. Wenger, TU Berlin; G. Côté, UBC) provides a description of a simulation environment including a mux interface description for use in conjunction with the video test model (Q15-E-12) in the creation of realistic performance simulations for the complete H.324M environment. Q15-E-15, Intra-Macroblock Refresh in Packet (Picture) Lossy Scenarios (S. Wenger, G. Côté, UBC), shows the effectiveness and simplicity of a straightforward application of the basic principal that frequent Intra updates enhance error resilience performance. An Intra refresh interval equal to the inverse of the packet loss rate was shown to provide enhanced performance over the range of 5-20% packet loss in the experiments. The minimum Intra refresh interval (132) required in H.263 was shown to have little impact on rate-distortion performance; Q15-E-37, Effects of Standard-Compliant Macroblock Intra Refresh on Rate-Distortion Performance (G. Côté, S. Wenger, M. Gallant, UBC), provides text to describe a method of complying with this requirement. In a similar spirit, Q15-E-36, Error Resilience for Mobile using GOB sync and Error Concealment (G. Côté, S. Wenger, UBC), notes that a straightforward application of GOB (Group of Blocks) structured coding with simple decoder error concealment provides significant error resilience. Q15-E-49, Feedback-Based Error Control for Mobile Video Transmission (B. Girod and N. Färber, U. Erlangen- Nuremberg), shows error tracking in a decoder with use of a back-channel for reporting error tracking status (per Appendix I of Rec. H.263) to be capable of providing further performance enhancement. This contribution is a draft of an academic publication on the topic, and contains a thorough explanation of the techniques, benefits, and applicability of a variety of error resilience methods. It also contains some remarks on the reference picture selection mode found in Annex N of H.263v2. A key observation regarding these three error resilience enhancement contributions (Q15-E-15, Q15-E-36, Q15- E-49) is that they do not require support of any optional enhancement of H.263 (whether in the form of present or future optional modes). They provide broadly applicable schemes for error resilience without requiring any special syntax support in H.263. Further benefits using such methods as Annexes K (slices), N (reference picture selection), O (scalability), and R (independent segment decoding) of H.263 can be added on top of a good implementation of the basic and universal syntactical features. An interest was expressed in future work toward adding these options to the system capabilities (Q15-E-36, Q15-E-49). New Error Resilience Technical Proposals Q15-E-19 (J.H. Park, Samsung) describes a software implementation of a syntax for possible H.263++ adoption of a new error resilience enhancement optional mode. The software implementation is based on the current software test model implementation available from the University of British Columbia. The current proposed syntax included data partitioning, reversible VLC use throughout (for COD, MCBPC, motion vectors, and coefficients), a packet sequence number, single-thread motion vector prediction, non-relative coding of the last motion vector, an altered bit

August – September 1998 Vol. 9.6 Copyright © CSR 1998 57 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATION stuffing mechanism, and markers dividing the partitions of mode information, motion vector data, and coefficient data. Q15-E-20, Test Results of Error Resilience with Modified Error Resilient Syntax with Data Partitioning & RVLC (A. Li, M. Fong, J. Wen, J. Villasenor, UCLA), provides preliminary experimental results using the proposed optional mode of Q15-E-19 over a binary symmetric channel (in comparison to an anchor with little error resilience). The group expressed a strong interest in this proposal and encouraged further evaluation and refinement of this scheme to determine whether (and to what degree) it could provide an enhancement of performance significantly beyond what is available with optimization of existing syntax use. Q15-E-23, Error Resilient Syntax in H.263+ Bitstream over Low Error-Prone Mobile Channel (D.S. Park, K.Y. Yoo, S.U. Kang, J.W. Jung, Samsung), advocates the adoption of a more robust syntax for certain header elements (COD, MCBPC, and CBPY) in future video syntax definitions. Adding redundancy to these syntax elements could prevent loss of sync in some cases and even provide error-correcting capability. The proposed method was tested with a low error-rate channel model (certain Wideband CDMA DECT 1 and 2 wideband error profiles). Again, further investigation and coordination with other error resilience enhancement proposals was encouraged. Q15-E-24 (K.Y. Yoo, D.S. Park, Samsung) proposes an error resilience resynchronization enhancement method known as an Intra-GOB marker (IGM). It proposes a mechanism for resynchronizing video content within a GOB using this special marker header. Q15-E-24 provides a theoretical analysis for justifying and for determining the optimal frequency of the addition of these resync marker locations, as well as some preliminary experimental results. The group questioned whether this proposed syntax was duplicating the capability of the slice structured mode of Annex K of H.263v2; the proponent responded that the IGM resync mechanism may use fewer bits than the slice header method to accomplish resynchronization. Further investigation is needed before the real performance impact of the IGM mechanism can be fully assessed. Q15-E-32 (N. Färber, T. Weigand, B. Girod, U. of Erlangen-Nuremberg) presents a new type of reversible VLC (RVLC, Reversible Variable Length Code) for error correction. The new design uses an intriguing new coding structure which is capable of constructing a reversible VLC bitstream from any VLC coding table by a process involving a delay and an exclusive-OR operator. In addition to providing reversible decoding capability, the new method can also correct a string of bit errors if the location of the errors is known to be confined to a small region of the bitstream of duration less than the delay length. The scheme introduces a fixed amount of extra overhead equal to the number of bits in the delay operator, which must be greater than or equal to the longest codeword length in the VLC code. Since the number of extra overhead bits is fixed, the added redundancy becomes vanishingly small as a percentage of the bitstream length for long bitstreams. Some experimental results were provided, which indicated a benefit for the use of this reversible VLC scheme in conjunction with data partitioning. The group was intrigued by this new reversible error-correcting VLC structure, and encouraged further investigation of the idea. System Interaction Issues Q15-E-45 (B. Wimmer, Siemens; T. Stockhammer, TU Munich) describes an error resilience advantage that could be obtained by separating some of the syntax elements of an H.263 bitstream and giving each type of syntax element a customized degree of forward error correction using rate compatible punctured convolutional (RCPC) codes. While this concept may be usable to achieve enhanced error resilience performance, it would require a very significant alteration between the video codec and system multiplex operations in a system. Its potential for improving system performance quality should not be neglected, however. Future video codec and/or system designs may benefit from the use of this principle. Q15-E-46 (B. Wimmer, Siemens; H. Tanaka, Toshiba; T. Stockhammer, TU Munich) investigates the interface between the video and system multiplex parts of a system design. It contains a file format and data structure appropriate for modeling today’s multiplex interface, and suggests video packetization priority/QoS handling in the multiplex (e.g., using FEC and ARQ mechanisms) for future multiplex definitions. In a similar spirit to Q15-E- 45, unequal prioritized handling of video data in the multiplex may yield future performance gains. Conclusions For the work on evaluation error resilience capabilities of the current syntax and of future syntax proposals, the group created two output documents to describe simulation conditions (Q15-E-50) and a test model codec implementation description (Q15-E-51) for future work. These documents should contain sufficient recommended evaluation conditions for greatly aiding the evaluation of error resilience techniques.

IMT-2000 WIRELESS Q15-E-47 is a liaison statement to ISO/IEC from the IMT-2000 definition effort in the ITU-R TG 8/1 in response to an ISO/IEC liaison on mobile multimedia service to TG 8/1. ITU-R TG8/1 agrees that it is desirable to support parallel bearer services and negotiable QoS and asks for examples of QoS parameters. Q15-E-48 is a liaison from ITU-R TG 8/1 requesting information on candidate video codecs for IMT-2000 application. SG16 will respond to this inquiry at its September meeting with information about the terminal and coding standards defined by SG16. TEST MODEL, SOFTWARE, ENCODING OPTIMIZATION

OVERALL TEST MODEL AND SOFTWARE ISSUES Q15-E-09 is the ad-hoc committee report on the test model, the availability of software, and the studies of encoding optimization. Q15/16 again noted the positive value obtained by having known anchor bitstreams and in having a strong test model document (currently TMN10, Q15-D-65 Tampere) for use in simulation testing. AVAILABLE SOFTWARE Q15-E-16 (M. Gallant, G. Côté, S. Wenger, F. Kossentini, UBC) describes an enhanced version of the software test model provided by the University of British Columbia. Q15/16 expressed its continuing gratitude for the availability of this high-quality software. Q15/16 discussed the status of future updates to the available software, including rate-distortion optimized implementation of the “high complexity” operational scenario of Test Model Number 10. There was some uncertainty as to whether UBC can continue indefinitely to provide free software updates, and the software provided by Deutsche Telekom has not been updated in several months. The group wishes to find a way to keep good, up-to- date software available, and encourages its members to support efforts in this direction. RATE-DISTORTION MOTION ESTIMATION AND MODE SELECTION Q15-E-26 (G. Sullivan, PictureTel; T. Weigand, U of Erlangen-Nuremberg) consists of a pre-publication draft of a paper on the topic of rate-distortion optimized video coding. It contains significant tutorial material on the evolution and basis of video coding techniques, and focuses on recent developments in rate-distortion optimized video coding such as those proposed by one of the authors which were adopted into the TMN10. SCALABLE TRAFFIC SHAPING Q15-D-30, Traffic Shaping for Spatially Scalable Encoding (D.Y. Suh, S.G. Chang, S.G. Han, Kyunghee U.), shows how the amount of bit-rate fluctuation in a video coder due to Intra frame coding could be reduced using bit allocation techniques combined with the existing scalability features of H.263v2 Annex O (temporal, SNR and spatial scalability mode). Since bit rate fluctuations can cause traffic flow problems on networks and can add delay in constant bit-rate operation, knowledge of techniques for smoothing out this fluctuation can be helpful for encoder design. RATE CONTROL WITH RATE-DISTORTION OPTIMIZATION There appears to be a bug in the definition of the test model operation in its high complexity rate-distortion optimized operational scenario. The problem is a “chicken and egg” issue. The described rate control technique uses the results of motion estimation to determine the step size to use in coding. However, the motion estimation uses the step size to determine the rate-distortion tradeoff in its search, and thus cannot functionally precede the rate control. The experts agreed to investigate two possible approaches for fixing this problem in a future test model release: 1. Using a one-pass rate control which does not require whole-frame motion estimation prior to rate control operation, instead of using a two-pass method. 2. Performing an initial motion estimation and mode decision (based perhaps on a prior average step size to determine the λ value to use), and then repeating the DCT and Quantization steps of the encoder after rate control operation to determine the final step size to use.

PROPOSALS AND DEMONSTRATIONS FOR H.263++ & H.26L

4X4 MOTION COMPENSATION AND TRANSFORM Q15-E-17 (G. Bjøntegaard, Telenor) describes progress on the use of a 4x4 block size in motion compensation and transform coding (a designated Key Technical Area of H.263++ investigation). It contains a description of several ideas being investigated, including the use of long-term picture memories (a designated Key Technical Area described below), rate-distortion optimization alterations, motion estimation optimization alterations, a new type of deblocking filtering, a new type of Intra spatial prediction, and some VLC alterations for transform coefficients, motion vectors, and coded block pattern. (The simulation did not use decoded bitstreams, but G. Bjøntegaard is confident of the results.) A D-1 videotape demonstration of the visual subjective performance of the 4x4 coding method was provided. The group agreed that a significant perceptual gain was generally visible with the 4x4 coding method in use and that these ideas warranted further investigation. ADAPTIVE QUANTIZATION Q15-E-29 (A. Bist, Rockwell) describes the latest syntax proposal and performance description for the technique known as adaptive quantization (a designated Key Technical Area of H.263++ investigation). Q15-E-29 notes some experimental results of the application of this technique, reporting “up to about 10% savings in bitrates” (depending on the test sequence and coding parameters). The encoding method used in adaptive quantization involves rate-distortion optimized quantization (although not taking into account the effect on RUN and LAST) for each possible selection of quantizer reconstruction configuration for the macroblock, followed by rate-distortion optimized selection of the best quantizer reconstruction configuration based on the results of the first optimization (including RUN and LAST effects). The method of coding which was used as a reference in the encoding work used rate-distortion optimization of quantization decisions, but did not include proper accounting for the RUN and LAST bit rate effects in that optimization. It was noted that since the adaptive quantization method did include the evaluation of precise bit rate effects at the macroblock quantizer selection level, the results could possibly be somewhat affected by this difference in the degree of encoding optimization. Q15-E-21, Simulation Results for Adaptive Quantization Using Trellis Based R-D Information (M. Luttrell, J. Wen, J. Villasenor, UCLA; J.H. Park, Samsung), discusses some efforts to cross-validate the work on the adaptive quantization technique, but uses a more highly-optimized quantization encoding method consisting of trellis encoding. Trellis encoding is currently perhaps the best method known for making quantization decisions, as it results in truly optimal rate-distortion results for an additive distortion measure such as squared error or frequency- weighted squared error. In particular, the trellis method accounts fully for the impact of RUN and LAST when making quantization decisions. This analysis obtained a somewhat lower performance estimate for the adaptive quantization technique relative to that described in Q15-E-29. A request was made in Q15-E-21 to see if a theoretical justification could be provided to show why the extra overhead bits that were needed for the technique would be justified by a sufficient performance gain from adapting the quantizer reconstructions (a 1992 ICASSP publication by A. Bist [Rockwell] was offered as a resource for consultation). Q15-E-21 also suggests that if the various reconstruction rules are not chosen with equal frequency, then perhaps a gain could be obtained by VLC coding the adaptive quantizer selection. Interestingly, a performance benefit of approximately 3.6% was reported in Q15-E-21 by changing only the codewords of the TCOEF VLC table (without switching to the adaptive quantization technique). The group discussed the history of the development of the TCOEF table and thought that, given the evolution in various aspects of video coding since the design of the table, and given the complex encoding optimization method, it may indeed be possible that such a gain could be obtained by a change of table values. (In particular, the TCOEF tables may have been created using an inverse quantization rule without a dead-zone.) There was an assertion that future coordination between the key teams of interested parties could yield a further convergence of opinion in regard to the performance of the adaptive quantization technique, as there may have been some aspect of the adaptive quantization proposal that was not fully understood or fully up to date. The group encouraged further investigation of the adaptive quantization scheme and of possible spin-off conclusions such as a measurement of the potential improvement by changing the TCOEF table even without use of adaptive quantization. However, the group felt that the limited amount of typical performance gain (5%?) that was reported in either of the contributions and the very high complexity of the adaptive quantization encoding techniques seem to cast doubt on its ultimate future as a justifiable feature in its currently-proposed form.

LONG-TERM/BACKGROUND MEMORY Q15-E-25 (T. Weigand, N. Färber, B. Girod, U of Erlangen-Nuremberg; B. Andrews, 8X8) reports further work on the subject of long-term memory for motion compensated prediction coding efficiency enhancement. Typical performance gains of 10-20%, and isolated performance gains up to 60% were reported. (It was noted that the anchors used were not the anchors agreed upon, but it was asserted that the differences between the anchors used and those agreed upon were slight.) The results were especially good when a start-up period of 50 frames was neglected in the performance measurements. Q15-E-17 (G. Bjøntegaard, Telenor Satellite Services) on the use of a 4x4 block size also includes some results for using long-term memory. G. Bjøntegaard reported that this technique did in fact hold some promise for improved coding efficiency, and could sometimes enhance coding efficiency performance even when only a few added frames of extra storage were added, especially for scenes with slow motion (such as mobile & calendar). He made an effort to compare this feature to that of B pictures, showing that in his experiments, better results could sometimes be obtained with lower complexity and reduced delay. Q15-E-44 (T. Weigand, N. Färber, B. Girod, U of Erlangen-Nuremberg; B. Andrews, 8X8) and an accompanying D-1 videotape demonstration showed the use of this technique for switching between camera sources in a surveillance application. The technique was shown to have a very high degree of effectiveness, although there were some comments that alternative means may be available for obtaining this benefit without the new method (such as the use of Annex N reference picture selection, perhaps with an alternative frame buffer storage policy, the use of the CPM(Continuous Presence Multipoint)/video-multiplex mode, or the use of distinct video bitstreams for each camera source with an external multiplex). The group agreed that long-term memory appears to hold promise for potential future adoption as an H.263++ enhancement and possibly for use in H.26L as well, and the technology was agreed to have a level of maturity sufficient for continued definition of a “core experiment” for controlled cross-verification of results. A core experiment description was provided as an output document of the meeting (Q15-E-52), and cross-validation of core experiment results is solicited. The group agreed to call the technique “enhanced reference picture selection” in its future work, as the method provides its coding efficiency improvement by providing a reference picture selection operation on a macroblock basis. There were no contributions on the enhanced scalability Key Technical Area of H.263++ development, although the group remains interested in this issue. IDCT MISMATCH REDUCTION Q15-E-17 on the use of a 4x4 block size and long-term memory (G. Bjøntegaard, Telenor Satellite Services) also includes a specification of an integer inverse transform. This type of specification can eliminate the vagueness of the decoding specification and the feedback-loop problems that make compliance testing difficult and can sometimes produce coding artifacts. The group remains highly interested in further work on this Key Technical Area of H.263++ development. DEBLOCKING AND DERINGING FILTERING Q15-E-22 (Y.L. Lee, KAIST; H.W. Park, D.S. Park, Y.S. Kim, Samsung Electronics) describes and demonstrates a loop filter design for enhancing visual perceptual quality. It uses directional classifications to customize the filter operation separately for horizontal and vertical block edge artifacts, and uses a method of identifying outlying values of block corner pixels for special treatment. In Intra frames, it uses a special flag and filter for ringing artifact reduction. The demonstrated filter was chosen for inclusion in the future MPEG-4 visual standard as informative content, and is the subject of an upcoming publication in the September issue of the IEEE Transactions on Circuits and Systems for Video Technology. A slight visible subjective gain was demonstrated for the use of the new filter relative to Test Model Number 8 with Annexes D, F, and J (unsure whether with or without the deringing post-filter of TMN8); a PSNR (Peak Signal to Noise Ratio) improvement was reported as well. The proposed new filtering scheme was judged to be somewhat “softer” in appearance – sometimes with a slight loss of detail. The group agreed to make the investigation of deblocking and deringing filters, either inside or outside of the loop, a designated Key Technical Area of H.263++ investigation, and the ideas were judged worthy of investigation in the context of H.26L as well.

WAVELET CODING Q15-E-31 (D. Marpe, Humboldt-Univ. Berlin) provides further information on the PACC wavelet coding method, along with a demonstration of its performance. (See Tampere Q15-D-57 for a technical description of the coding method.) The scheme basically involves the use of a zero-tree wavelet coder with overlapped-block motion compensation. The motion model of the demonstrated codec did not include 8x8 block size use or rate-distortion optimized motion estimation, and was therefore somewhat harmed in potential performance relative to the test model reference. (It also had no Intra mode in Inter frames.) The demonstrated performance of the method was judged essentially equivalent to that of the reference H.263v2 anchors, better with low motion, and not as good for Intra. Further study and investigation of this coding technique is encouraged, especially in the context of H.26L. RESULTS AND KEY TECHNICAL AREAS Q15-E-52 is an output contribution describing a core experiment description for enhanced reference picture selection experiments. The group agreed that independent implementation of software embodying the differences between any proposed syntax and the prior standard syntax is needed for adoption of a core experiment result into the draft, as well as a group assessment of the core experiment design and results. With regard to the H.263++ project, a modified list of Key Technical Areas was adopted. Two new KTAs were adopted at this meeting: 1. Deblocking and deringing filters (either normative or informative, either inside or outside the prediction loop), in response to the contribution showing potential for performance gain. 2. Error concealment (either normative or informative), in response to contributions showing the benefits of these techniques and to assertions made that encoders could potentially benefit from knowing what error concealment method is used in a decoder. (Some degree of defined error concealment may already be available through the use of the “videoNotDecodedMBs” indication in H.245, which can be used to report “lost” macroblocks to an encoder – which may be implied to be represented as skipped macroblocks.) With regard to the H.26L project, the first formal technology evaluation of H.26L proposals is planned for November of 1998, but all of the technical contributions received at this meeting appear to contain some relevance. VIDEO CODING FOR SIGNING AND LIP READING No contributions on video coding for signing and lip reading were received at this meeting. Q15/16 encourages attention to the draft application profile written on this topic in Tampere in Q15-D-47 (G. Hellström, Omnitor) and looks forward to contributions at future meetings. Q15/16 also noted the inclusion of the new signing test sequence “Irene” in their current codec evaluation simulation conditions, which is a positive development toward further investigation of this area. WORKPLAN FOR H.263++ The target date for the creation of a first draft of H.263++ (and last formal draft adoptions) needs to be adjusted as no first draft was adopted at this meeting. The workplan schedule was (Table 2) otherwise unchanged.

Meeting Approx Date Type Milestone SG16-3 14 Sep ‘98 Study Group Q15-F Nov ‘98 Experts First Formal Draft Adoptions Q15-G Jan ‘99 Experts Last Formal Draft Adoptions SG16-4 15 Mar ‘99 Study Group Q15-H Jul ‘99 Experts Q15-I Nov ‘99 Experts Final Draft for Determination SG16-5 Feb ‘00 Study Group Determination Q15-J Apr ‘00 Experts Bug-checking Q15-K Jul ‘00 Experts Final Draft for Decision SG16-6 Nov ‘00 Study Group Decision Table 2. Workplan For H.263++

WORKPLAN FOR H.26L The first formal technical evaluations for the H.26L project are planned for November of 1998. The workplan schedule for H.26L is shown in Table 3. No modifications were made at this meeting to the planned call for proposals, delay model, or demonstration conditions for H.26L. One issue of H.26L relevance that was noted at the meeting is the danger of over-training of VLC tables and codebook entries that can arise by using the same data for training an encoder design that is subsequently used for evaluating the encoding performance. The group asked for full disclosure of the training methods of any (especially large) VLC tables and codebooks which are included in future proposals. Proponents should train such tables on separate data from the test evaluation data (unless such training is to be considered part of the encoding process along with a means of sending the trained information to the decoder). This applies to all proposals, not just H.26L, but seems particularly relevant to H.26L given the wider variety of techniques that may be investigated in its context. CONTINUING AD HOC COMMITTEES The future workplans for the H.263++ and H.26L projects and for deployment of the prior video codec standards were briefly reviewed. The following ad hoc committees were established to progress the work between now and the next meeting: Ad Hoc Committee Chair H.263v2 packetization T. Gardos (Intel) H.263+ in H.320 (activity now to be primarily in Q11) S. Gupta (VTEL) Error Resilient Simulation Conditions and Evaluations S. Wenger (TELES AG) Compatibility between MPEG-4 and H.263 G. Sullivan (PictureTel) Test Model and Software Development K. Hibi (Sharp) H.263++ Development G. Sullivan (PictureTel) H.26L Development K. Hibi (Sharp)

Meeting Approx Date Type Milestone SG16-3 14 Sep ‘98 Study Group Q15-F Nov ‘98 Experts First Formal Evaluations Q15-G Jan ‘99 Experts First Draft Text and Test Model SG16-4 15 Mar ‘99 Study Group Q15-H Jul ‘99 Experts Q15-I Nov ‘99 Experts Final Major Feature Adoptions SG16-5 Feb ‘00 Study Group Q15-J Apr ‘00 Experts Q15-K Jul ‘00 Experts SG16-6 Nov ‘00 Study Group Q15-L Apr ‘01 Experts Q15-M Jul ‘01 Experts SG16-7 Aug ‘01 Study Group Determination Q15-N Oct ‘01 Experts Bug-Checking SG16-8 Jan ‘02 Experts White Document Generation Q15-O May ‘02 Study Group Decision

Table 3. Workplan For H.26L.

Q15/16 EXPERTS MEETING ROSTER, JULY 21 – 24, 1998, WHISTLER, BC, CANADA Gary Sullivan, PictureTel Q15/16 Rapporteur Hosts: TELES AG and the University of British Columbia Canada Univ. of British Columbia Hussein Alnuweiri [email protected] Canada Univ. of British Columbia Guy Côté [email protected] Canada Univ. of British Columbia Michael Gallant [email protected] Canada Univ. of British Columbia Faouzi Kossentini [email protected] Finland Nokia Research Center Ari Hourunranta [email protected] Finland Nokia Research Center Joni Vahteri [email protected] France France Telecom/CNET Patrick Boissonade [email protected] France Lab. d’Electronique Philips Jacques Paulin [email protected] Germany Deutsche Telekom Berkom Peter List [email protected] GmbH Germany Robert Bosch GmbH Peter Vogel [email protected] Germany Siemens AG Bernhard Wimmer [email protected] Germany TELES AG / TU Berlin Stephan Wenger [email protected] Germany U. of Erlangen-Nuremberg Thomas Wiegand [email protected] Italy Aethra Telecomunicazioni Roberto Flaiani [email protected], [email protected] Japan Fujitsu Laboratories Ltd. Akira Nakagawa [email protected] Japan Toshiba Corp. Yoshihiro Kikuchi [email protected] Japan Toshiba Corp. Toshiaki Watanabe [email protected] Korea Kyunghee University Doug Young Suh [email protected] Korea Samsung Electronics Dong-Seek Park [email protected] Korea Samsung Electronics Kook-Yeol Yoo [email protected] Norway Telenor Research Gunn Kristin [email protected] Klungsøyr Norway Telenor Satellite Services AS Gisle Bjontegaard [email protected] Sweden Ericsson Telecom AB Per Thorell [email protected] Sweden Telia Research AB Marie Dahlqvist [email protected] UK ImageCom Ltd. John Mason [email protected] USA 8x8, Inc Barry Andrews [email protected] USA Bell Atlantic Katrina Hopkins [email protected] USA Delta Information Systems Ernest Schmidt [email protected] USA Intel Corporation Tom Gardos [email protected] USA Nokia Mobile Phones Andy Teng [email protected] USA PictureTel Gary Sullivan [email protected] USA Rockwell International Anurag Bist [email protected] USA Rockwell International Tom Geary [email protected] USA Sharp Labs of America Jordi Ribas-Corbera [email protected] USA Sorenson Vision, Inc Chien-Min Huang [email protected] USA Toshiba Corp. Barry Aronson [email protected] USA U. of California,Los Angeles Matthew Fong [email protected] USA U. of California,Los Angeles Maximilian Luttrell [email protected] USA VTEL Smita Gupta [email protected]

64 Vol. 9.6 Copyright © CSR 1998 August – September 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS REPORT OF TR-30, DATA TRANSMISSION SYSTEMS AND EQUIPMENT, JULY 27 – 29, 1998, QUEBEC, PQ, CANADA TR-30.1, MODEMS L. Brown (Motorola), TR-30.1 chair, announced that Compaq and Diamond Multimedia will be dropped from the voting list. VoCAL Technologies requested to be added to the voting list. TR-30.1/98-06-020 (L. Brown, TR-30.1 chair) is a liaison to TR-30.2 proposing a joint meeting in Quebec on the issue of modem diagnostic commands. TR-30.1/98-07-022 (L. Brown, Motorola), the latest version of the Issues list for V.90 Issue 2, was reviewed and accepted. TR-30.1/98-07-023 (V. Krishnan, Cirrus Logic) suggests a liaison to TR-41 and other cognizant standards bodies regarding a digital interface to V.90 digitally connected (e.g., DDS, fractional T1. ISDN BRI, digital PBX, etc.) modems. Considerable discussion followed, but it was not clear whether such digital interfaces need to be defined in other committees and just what the digital interfaces need to be, so no action was taken. TR-30.1/98-07-025 (R. Brandt, on behalf of Gallaudet University) proposes a default country-specific probe message for V.18 non-continuous carrier modes. V.18 does not currently specify this message. Discussion determined that this concern would be more appropriately addressed in TR-30.2 under the V.250 discussions. R. Brandt reported that he already drafted a contribution to TR-30.2 on other proposed modifications to V.250 so he would follow it up there (see TR-30.2 report, below). TR-30.1/98-07-024© (F. Lucas, 3Com, TR-30.2 chair) is the latest version of the Microsoft proposal for a Unimodem Diagnostic Command Specification. This contribution was discussed in a joint session with TR-30.2. After an extensive discussion, it was decided to develop a proposed USA contribution to SG16 to start work on a set of diagnostic commands. Dick Brandt, dB Consulting

TR-30.2, DATA TRANSMISSION

ITU-T S TUDY GROUP 16 The members of TR-30.2 decided not to provide a contribution to Q6/16 on changes to Rec. V.24. TR-30.2/98- 03-003 (Deutsche Telekom) is a proposal to add a “Sensitivity” to the definition of each interchange circuit such that it is either State or Transition sensitive. The members of TR-30.2 concluded that this addition would not affect the operation of existing or future modems and saw no reason to comment on the work. MODEM DIAGNOSTIC COMMANDS A joint meeting with TR-30.1 was held to discuss new AT commands in support of the Microsoft proposed Modem Diagnostic Commands. The latest issue of the Microsoft document (TR-30.2/98-07-020©) was distributed. There is general support for this work, however, a close examination of the Microsoft document is necessary to determine which functions should be included in proposals to the Q7/16 work in the V.25x series of Recommendations. To initiate the work, a proposed USA contribution (TR-30.2/98-07-021) to SG16 Working Part 1 was approved; it proposes that work begin on defining a set of managed objects for providing Diagnostic information from Voice- band modems. It is expected that TR-30.2 will be the primary source of contribution to this work. ADDITIONS/MODIFICATIONS TO V.250 COMMANDS TR-30.2/98-07-019 (R. Brandt, on behalf of Gallaudet University) proposes the addition of commands to ITU-T Recommendation V.250 in support of Recommendation V.18. After considering this contribution, a proposed USA contribution to SG16 was drafted. It allows user definition of the character strings in the non-continuous carrier probes. As an example, such strings could be initiated at an emergency call reception center (911) when a “silent call” is encountered to provide a specific text message such as “you have reached 911.” This contribution (TR- 30.2/98-07-022, “Proposed changes to V.250 related to probing sequences in V.18”) was approved by TR-30.2 and will be considered under Q7/16 and Q9/16 in September.

TDDS ON CELLULAR R. Brandt reported on the continued work in the Cellular Telecommunications Industry Association regarding an interface for TDDs (Telecommunication Devices for the Deaf). CTIA continues to investigate the use of TIA/EIA- 688 (DTE/DCE interface for digital cellular equipment) for use as the interface. There may be a need for an alternate use of one of the interchange circuits to provide a control for switching between Voice and Data modes. If this is the case, TR-30.2 will undertake a revision of TIA/EIA-688. Fred Lucas, 3Com

TR-30.3, DATA COMMUNICATIONS EQUIPMENT EVALUATION AND NETWORK INTERFACES TR-30.3/98-07-068© provides information on how to access the TIA FTP sites. Only TIA committee members are allowed access to this site. TR-30.3/98-07-069 (TIA) provides ANSI procedures to follow in response letters to negative ballots. TIA standards procedures were recently audited by ANSI (part of the normal process of maintaining accreditation), and TIA is tightening its procedures accordingly. TR-30.3/98-07-073 is the Assignment List from the June 1998 TR-30.3 meeting. PN-3459, REVISING TSB-37A (T ELEPHONE NETWORK TRANSMISSION MODEL FOR EVALUATING MODEM PERFORMANCE) TR-30.3/98-07-071 is the ballot version of SP-3459, Telephone Network Transmission Model for Evaluating Analog Modem Performance. TR-30.3/98-07-076 and TR-30.3/98-07-076Add (R. Perez, Bellcore) are corrections to Table C1 (Intercontinental network test channels) and Proposed Figure D28 (Impairment Combination B23 similar to B21 and B22 with analog transmission link) and related Text for Annex D (Basis for network models). TR-30.3/98-07-084 (M. Pellegrini, TAS) are PN-3459 ballot comments. TR-30.3/98-07-085 (H. Holzbaur, NSTL) are V.90 Test Results. They show the data rate for 10 different tests in characters per second of different data types (compressed, graphics, text) over different TSB-37 impairments. TR-30.3 decided to make the following changes to SP-3459 after reviewing the ballot comments: • Change all 37Bs to 3700 • Change all 38As to 3800 • Page vi, line 38 remove “unjustifiably” • Page vii, line 6 should read “…should produce equal to or better modem performance.” • Page 1, line 24 add sentence “Higher levels of IMD are used to take into account the transformer that are used in PBXs.” • Page 1, line 25 change “modes” to “models.” • Page 1, line 34, remove “The more likely of such” replace with “Some of these” • Page 1, line 39, should read “… flat with frequency…” • Page 4, line 9, R. Perez (Bellcore) will rewrite definition for assigned network distribution • Page 8, line 27 remove word “revision B” • Page 50, line 9c ADPCM Location B16,1; B17,1; B18,1 • Page 50, line 9c (Bottom half) ADPCM Location B19,1; B20,1; B21,2; B22,2; B23,2 R. Perez (Bellcore) will revise tables and figures in TR-30.3/98-07-076 and submit them with his ballot. All the changes requested in TR-30.3/98-07-084 Ballot comments (M. Pellegrini, TAS) were accepted. SP-3459 will be sent out for a default ballot because of the technical changes. A revised copy of SP-3459 that incorporates the changes recommended in the ballot comments will be submitted to Study Group 16 Question 10 (September, 1998) for their consideration for incorporation into V.56 bis. PN-3509, REVISION OF TSB-38 (TEST PROCEDURES FOR EVALUATING MODEM PERFORMANCE) TR-30.3/98-07-064 (W. Henderson, Henderson Labs) is draft 5 of PN-3509, Test Procedures for Evaluation of 2 Wire Duplex Modems. It was reviewed.

PN-3251/PN-3507, C ELLULAR MODEM TESTING TR-30.3/98-07-067 is e-mail from G. Smith (BellSouth Cellular) noting that he will not be able to support further development of the AMPS cellular data test model or test plan. TR-30.3 decided to cancel both PN-3251 (Cellular Network Transmission Model) and PN-3507 (Test Procedures for Cellular Modems). PN-3856, TEST PROCEDURES FOR EVALUATING PCM-MODEM PERFORMANCE. TR-30.3/98-07-078© (W. Henderson, Henderson Labs) is draft 3 of PN-3856, Test Procedures for Evaluation of PCM Modems. TR-30.3/98-07-081 (W. Henderson, Henderson Labs) is the Test Plan Proposal for PN-3856. PN-3857, TELEPHONE NETWORK TRANSMISSION MODEL FOR EVALUATING PCM MODEMS PERFORMANCE TR-30.3 reviewed and edited Draft 7 of PN-3857 Transmission Model for Evaluating PCM Modem Performance (TR-30.3/98-07-077© and TR-30.3/98-07-077A1 and TR-30.3/98-07-077A2, G. Hillman, Motorola, the draft itself and editor’s notes on the draft, respectively). The following documents were considered: • TR-30.3/98-07-057, Changes made to various sections of PN-3857 Draft 6 (R. Perez, Bellcore) • TR-30.3/98-07-060, Information on Connect V.90 Connect Rates of Multiple ISPs. Provided by J. Decuir, Microsoft from BoardWatch magazine. Connection rates range from 97.85% to 70.45% with the average being 91.11%. • TR-30.3/98-07-061 and TR-30.3/98-07-061A, Test Reduction Proposal (S. Satchell, Henderson Labs). They propose reducing the number of tests by eliminating test channels that represent small fractions of the model. • TR-30.3/98-07-062, PSTN Loss Model and the Changes in the Rules of Thumb (S. Satchell, Henderson Labs), notes concern that the network loss model has changed (e.g., circuits may have loss in only one direction) and many modem designers may not be familiar with the changes. It proposes opening a project to generate a TSB to explain the new rules. • TR-30.3/98-07-063, Impairment Mapping PN-3857 (S. Satchell, Henderson Labs). PN-3857 Draft 6 is not clear on where impairments need to be inserted in the diagrams. Mixed nomenclature adds to the confusion. This contribution proposes to fix this problem and also provides a map as to which impairment is applied to which box in the diagrams. • TR-30.3/98-07-079, Proposed Text for “Evolution of Modem Test Standards PN-3857” (H. Hagen, Lucent). • TR-30.3/98-07-082©, copy of ITU Recommendation G.711. Pulse Code Modulation (PCM) of Voice Frequencies (ITU) • TR-30.3/98-07-083, 4.5 dB Digital Pad Translation Table for PN-3857 (B. Adams, Hayes) TR-30.3 decided to focus on preparing the document for forwarding to SG16 Q10. The following comments, recommended changes and homework assignments were made: • J. Douglass (Oak Technologies) will request information on network statistics from Invest Technology and CompuServe. • TR-30.3 decided to keep 12 lines in the UNAA (universal network access arrangement) Network model (subscriber is connected via a universal digital loop carrier system). The next draft will be changed back to 12 lines to reflect this decision. • R. Perez (Bellcore) will supply a description of Multiple RBS (Robbed-bit signaling) links, which may not be in sync. • H. Hagen (Lucent) will investigate whether the least significant bit is preserved in RBS. • H. Hagen (Lucent) will investigate the relationship of lost bits associated with digital loss pads when RBS is used in PBXs. • H. Hagen (Lucent) will provide transmit and receive CODEC characteristics. • D. Brandt (Motorola) will request information on transmit and receive CODEC characteristics from T1E1. • R. Perez (Bellcore) will write a rationale for the network configuration scores. • S. Satchell (Henderson Labs) and R. Perez (Bellcore) will prepare a rationale for the PSTN loss model used in PN-3857. The results of this editing process will be reflected in Draft 8 of PN-3857. Draft 8 will be submitted to SG16 Q10 for their consideration for incorporation into recommendation on PCM Modem testing.

PN-4254, TELEPHONE NETWORK TRANSMISSION MODEL FOR EVALUATION XDSL SYSTEMS, AND PN-4255, TEST PROCEDURES FOR EVALUATING X DSL SYSTEM PERFORMANCE TR-30.3/98-07-075 and TR-30.3/98-07-074 are revised Project Requests for PN-4254 and PN-4255, respectively. G. Hillman (Motorola) is the editor for PN-4254; W. Henderson (Henderson Labs) is the editor for PN- 4255. P. Kyees (Paradyne) distributed three documents: • TR-30.3/98-07-058, Compendium of Paradyne DSL Testing Contributions submitted to Q4/15 from Jan. to Jul. 1998 • TR-30.3/98-07-059, Paradyne Comments on Work Program on DSL Testing. It makes the following recommendations: —Scope of work should include all DSLs. —Transmission model must accurately reflect the real world. —Both splittered and splitterless models should be included. —Work should include interfering effects of DSL on PSTN services and devices. —Work should include interfering effects of DSL on itself and other DSL services. —All potential impairments to DSL performance must be identified and characterized. • TR-30.3/98-07-066, information on the ADSL Forum P. Kyees (Paradyne) then presented a tutorial on xDSL. Notes of the presentation are in TR-30.3/98-07-080. A call for papers on xDSL was made. TR-30.3/98-07-072 (E. Eckert, Chairman T1E1, Nortel) is a liaison from T1E1 concerning a Test Suite for xDSL Systems. J. Douglass (Oak Technology) will contact ATM Forum Chair, M. Humphrey (GlobeSpan); T1M1.3 Chair, C. Brownmiller (MCI/Worldcom); and ADSL Forum Technical Committee Chair, G. Young (BT Labs) regarding the current work on PN-4254 and PN-4255. Jack Douglass, Oak Technology

TR-30 MEETING ROSTER, JULY 27 – 29, 1998, QUEBEC, PQ, CANADA Dick Brandt, dB Consulting Chair, TR-30 Les Brown, Motorola ISG Chair, TR-30.1 Fred Lucas, 3Com Chair, TR-30.2 Jack Douglass, Oak Technology Chair, TR-30.3 Host: Motorola

3Com Don LeClaire Lucent Horace Hagen 3Com Fred Lucas Lucent John Magill 3Com Richard Williams Motorola (dB Consulting) Dick Brandt AMP Ben Bennett Motorola ISG Les Brown Analog Devices Rao Nuthalapati Motorola SPS Garth Hillman Ascend Ken Jones Multitech Sam Gopalan Bay Networks Slobodan Jovanovic NSTL Helen Holzbaur Bellcore Ricardo Perez Oak Technology Jack Douglass Cirrus Logic Xuefeng Jiang Paradyne Philip Kyees Cisco Systems Dave Houghton Paradyne R. K. Smith Cisco Systems Tom Martin PC-Tel Gary Anwyl Cisco Systems Kevin Riley Phillips Veronique Brun Consultronics Jocelyn Doire Rockwell Stan Bacon Digicom Systems Guojie Dong Rockwell Keith Chu ESS Technolgy Jordan Cookman Rockwell Joe Hoang GDC Tat Ho Rockwell Thomas Liau Hayes Bruce Adams Siemens Microelectronics Neal King Henderson Testing Labs Warren Henderson TAS Mike Pellegrini IBM Ali Sadri TriSignal Comm Jean Belleau

68 Vol. 9.6 Copyright © CSR 1998 August – September 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS REPORT OF ITU-T Q23/16 PCM MODEM MEETING JULY 30 - 31, 1998, QUEBEC CITY, CANADA The primary purpose of this Q23/16 PCM Modem Rapporteurs meeting was to progress the work on the all-digital mode for PCM modems (now referred to as V.adm) in preparation for Determination at the SG16 meeting in Geneva, September 1998. The all-digital mode occurs when a digitally connected modem (e.g., part of a user’s ISDN terminal adapter) connects to another digitally connected modem (e.g., a V.90 modem connected to a T1 or PRI interface at an ISP) and there is a digital path between them. PCM98_15 is the report of the previous meeting in Red Bank, New Jersey, April 30 – May 1, 1998. It was approved. V.90 - ISSUE 1 PCM98_18 (R. Williams, 3Com) proposes 12 editorial changes to the text of V.90. It was approved with the addition of one more editorial point. PCM98_19 (R. Williams, 3Com) is the material for the proposed Appendix describing the use of V.90 modems, including the network topology over which V.90 operates. It was approved, with some revisions. V.90 is expected to be approved (“Decided”) at the SG16 meeting in September. CONTINUING WORK ON PCM MODEMS

P.90 Issue 2 PCM98_07R1 (L. Brown, Motorola, Q23/16 Rapporteur) is the initial list of agreements for V.90 – Issue 2 that was approved at the Red Bank meeting, reformatted into an Issues List. The plan is to Determine V.90 Issue 2 at the SG 16 meeting April, 1999. V.90 issue 2 would be used where only one end of the system is digitally connected and would offer a higher data rate upstream channel than V.90 Issue 1. PCM98_16 (L. Brown, Motorola, Q23/16 Rapporteur) is the Issues List for the continued work on PCM modems, an update to PCM98_07R1 based on agreements at the TIA TR-30.1 meeting in Asheville, North Carolina, June 17, 1998. V.adm PCM98_20 (R. Williams, 3Com) is proposed baseline text for V.adm, the all-digital mode for V.90. Q23/16 approved this after some revision. It was also agreed to request that the all-digital mode be a separate Recommendation, rather than an extension of V.90. PCM98_17 (Proposals for V.90 all-digital Mode, R. Williams, 3Com) and PCM98_23 (V.90 DPCM to DPCM all-digital Startup, B. Barazesh, Lucent) are referenced in PCM98_16 but were not distributed or discussed. PCM98_17 proposes to use a small DC component to the V.8 or V.8bis signals to identify if the link between the modem is digital. It also describes in tutorial fashion the changes to the V.90 negotiation and operation proposed. PCM98_21 (R. Williams, 3Com) proposes additions to V.adm. It addresses how to detect an all-digital connection, how to detect digital slips, how to cleardown from data mode, what INFO bits to include, what DIL to use, and what form the startup should take. PCM98_22 (R. Williams, 3Com) proposes the addition of a specific DC (direct current) offset to Phase 1 signals to probe for all-digital connections. PCM98_24 and PCM98_30 (both from G. Hoefer, Siemens AG) address fast startup for two modems connected via an ISDN line using V.adm. They propose that the modems try to detect a 64 kbit/s clear channel early during startup, and if detected, bypass the V.90 encoding. This would allow the modems to work with existing ISDN terminal equipment in combination with V.42bis data compression to achieve greater throughput. PCM98_25 (K. Chu, Rockwell) proposes that V.adm include a mandatory always on in-band control channel for things such as monitoring and acquisition of digital frame synchronization, in-band modem control requests, and a secondary data channel for applications like remote diagnostics. PCM98_26, Identification of V.90 digital to digital mode (T. Liau, Rockwell), proposes a method for identifying all-digital connections in V.adm. This is an alternative to the proposal contained in PCM98_22 (R. Williams, 3Com). PCM98_27 (T. Liau, Rockwell) proposes a fast startup procedure for V.adm. The proposal includes a mode that enables the Phase 3 DIL (Digital Impairment Learning) sequence to be bypassed when no digital pads or A-law to mu-law conversions are present.

PCM98_29 (B. Barazesh, Lucent) discusses various aspects of the all-digital mode startup. V.PCM AGREEMENTS REACHED During the discussion of the contributions, the following agreements were reached and new open issues identified for the PCM all-digital mode (V.adm): • Agreed that the all-digital mode should be a separate Recommendation, which will be referred to for now as V.adm. V.adm becomes a separate project from V.90 issue 2. • Agreed that a mechanism to force symmetric data rate operation shall not be specified (a revision of item number 2.1 on the issues list). • Agreed that a retrain mechanism shall be defined (a revision of item number 7.1 on the issues list). • Agreed that the retrain procedure shall fall back to the beginning of Phase 2 (a revision of item number 7.2 on the issues list). • Agreed that an auxiliary/control channel shall be specified. It shall be mandatory in the transmitter and optional in the receiver. The receiver shall decide during INFO exchanges whether the remote modem’s control channel is transmitted or not (i.e., there is asymmetric control). • Agreed that the auxiliary/control channel shall be used for detecting digital slips (a revision of item number 12.2.1 on the issues list). • Agreed that cleardown shall be indicated in the control channel, if present (a revision of item number 13.1 on the issues list). • The data rate and format for the auxiliary channel is a new open issue. • Agreed that the auxiliary channel shall use sign bits only. • How loss of carrier should be detected is a new open issue. • Agreed to close item number 14.2 on the issues list concerning fallback to V.34 after entering the training procedure for the all-digital mode. • Agreed that Phase 2 shall be digitally encoded, with bits mapped as the sign of the PCM codeword Ucode66 (a revision of item number 16.2 on the issues list). • Agreed that Phase 4 shall consist of a CP/CP’ exchange followed by Ed followed by two data frames of B1d (a revision of item number 18.3 on the issues list). With this agreement, item 18.1 on the issues list is closed. • Subject to network echo devices not existing in all-digital circuits, it was agreed that a mechanism shall be defined to escape to a 64 kbit/s clear channel, thereby bypassing the V.90 encoder. • Agreed to the baseline text contained in PCM98_20 for V.adm. • How to detect a 64 kbit/s clear channel is a new open issue. • Agreed to a general structure for Phase 1 and Phase 2 of V.adm (to be described in the next revision of the issues list). • The content of some Phase 1 and Phase 2 signals is a new open issue. • The codeword to use for SCR in Phase 3 is a new open issue. With all of these agreements, it should be possible to complete the draft for Determination at the September 1998 meeting of SG16 in Geneva. The main issues that remain open are: • What mechanism to use to detect the presence of an all-digital connection (and a 64 kbit/s clear channel), and the definition of the associated signals. • The definition of INFO bits during Phase 2 of the startup procedure. • The definition of the auxiliary/control channel. • The structure and detail of Phase 3 of the startup procedure. INTELLECTUAL PROPERTY The following companies indicated verbally that they may have IP pertaining to V.adm: 3Com, Lucent Technologies, and Rockwell. Les Brown, Motorola ISG

Q23/16 PCM MODEM MEETING ROSTER, JULY 30 - 31, 1998, Q UEBEC CITY, CANADA

Les Brown, Motorola ISG Q23/16 Rapporteur Host: Motorola 3Com Fred Lucas [email protected] 3Com Richard Williams [email protected] Analog Devices Rao Nuthalapati [email protected] Ascend Ken Jones [email protected] Bay Networks Slobodan Jovanovic [email protected] Cirrus Logic Xuefeng Jiang [email protected] Cisco Systems Kevin Riley [email protected] ESS Technology Jordan Cookman [email protected] General Datacomm Tat Ho [email protected] Hayes Bruce Adams [email protected] IBM Ali Sadri [email protected] Lucent Technologies Bahman Barazesh [email protected] Lucent TechnologiesUK John Magill [email protected] Motorola Les Brown [email protected] Motorola SPS Garth Hillman [email protected] MultiTech Systems Sam Gopalan [email protected] Philips Veronique Brun [email protected] Rockwell Keith Chu [email protected] Rockwell Thomas Liau [email protected] Siemens Neal King [email protected] VoCAL Technologies Victor Demjanenko [email protected]

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August – September 1998 Vol. 9.6 Copyright © CSR 1998 71 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATION REPORT OF Q4/15 DCES FOR SUBSCRIBER ACCESS SYSTEMS RAPPORTEURS MEETING, AUGUST 3 – 7, 1998, ANTWERP, BELGIUM AB-001 (D. Stuart, 3Com , Rapporteur) is the proposed agenda. AB-002 is the draft report of the June 29 - July 3, 1998 Q4/15 meeting in Hawaii. These documents were accepted. IPR AB-11, AB-48, AB-59, AB-85, AB-91, AB-94, and AB-97 are IPR statements from TI, Sumitomo Electric, NEC, PC Tel, VoCAL Technologies, PairGain and Centillium, respectively. All indicated that they would conform to para. 2.3 (license under reasonable terms) of the ITU IPR Policy. AB-11 (TI) clarifies that Amati is a wholly owned subsidiary of TI and is therefore covered under the T1 IPR statement. To date, the following 27 companies have indicated that they hold IPR: 3Com Fujitsu Paradyne Alcatel GDC PC Tel AMD GlobeSpan Racal Datacom Amati/TI ITeX Rockwell Aware Lucent SAS Analog Devices Matsushita Stanford Univ. Centillium Motorola Sumitomo Electric Cirrus Logic NEC TI Cisco Systems PairGain VoCAL Tech. Compaq GENERAL ISSUES AB-021 (G. Zimmerman, PairGain) presents results of laboratory studies of the various aspects of PAR reduction on G.lite and G.dmt. It shows that the continuous time signal (line side) had greater PAR than was expected from the discrete time signal. Although AB-021 is offered for information only, the results indicate little or no value in the PAR techniques. AB-061 (G. Long, Centillium; N. Dagdeviren, Lucent; K. Krishnan, Cirrus) proposes a PAR reduction technique based on subset inversion. AB-062r1 (G. Long, Centillium; N. Dagdeviren, Lucent; K. Krishnan, Cirrus; Y. Goldstein, GDC) proposes the text changes for G.dmt and G.lite to include the PAR reduction technique proposed in AB-061. AB-061r2 presents the implementation method. AB-063 (G. Long, Centillium; N. Dagdeviren, Lucent; K. Krishnan, Cirrus) analyzes the use of the PAR reduction technique proposed in AB-061. AB-027 (F. Van der Putten & D. Van Bruyssel, Alcatel) identifies that lower gi values allow power saving and reduced cross-talk, and proposes that gi values be in the range [-14.5, +2.5] dB. AB-049 (K. Matsumoto & M. Ueda, Sumitomo Electric, with NEC, Fujitsu, NTT) presents revised results of the performance for line characteristics with primary line constant G taken into account which is provided in AB-045. AB-045 (K. Kikushima, NTT) proposes the Revised Version (Rev. 2) of the previous WH-063 (Rev. 1) for inclusion in G.test. The proposed draft is for both G.dmt Annex C and G.lite-TCM. AB-055 (N. Billington, BT) presents BT’s requirements for interworking between ANSI T1.413 Issue 2 and the ITU-T ADSL Recommendations. AB-073 (F. Van der Putten, Alcatel) proposes replacement text for the definition of loss of signal. AB-106 (F. Van der Putten, Alcatel) proposes that the ATU-C not be allowed to overrule the ATU-R’s option selection. AB-080 (J. Mueller, 3Com plus 5 companies) describes how a quiescent mode could be implemented in both the G.dmt and G.lite Recommendations. It also provides proposed text. AB-090 (J. Mueller, 3Com) reports on a preliminary study of fluctuating levels of FEXT and NEXT; it notes that they should not be a concern for non-overlap systems. AB-093 (V. Demjanenko & A. Torres, VoCAL Technologies) proposes the optional use of Parallel Concatenated Code.

G.LITE C. Hausen (Intel) is the G.lite editor. AB-008© (C. Hansen, Intel) the latest draft of G.lite which includes the issues list going into this meeting. AB-018 is the updated issues list which was provided after the meeting. PSD MASK AB-042 (J. Carlo, TI) proposes an overlap spectrum mask for G.lite (high same as G.lite non-overlap, low same as G.dmt overlap). The PSD mask was agreed. AB-044 (K. Kikushima, NTT plus Oki Electric, Mitsubishi Electric, Matsushita, Fujitsu, Sumitomo Electric, & NEC) proposes for both G.lite and G.dmt that the FDM with non-overlapped spectrum be mandatory, and echo cancellation with overlapped spectrum be optional. AB-050 (Y. Goldstein, GDC) provides simulation results comparing the performance of Interleaved DMT to both FDM and EC (echo canceled). Because interleaving offers performance only when NEXT is symmetrical, AB-050 does not recommend its inclusion. AB-060 (D. Manor, Orckit, MOC Israel) proposes a change to the ATU-C PSD mask to minimize its impact on VDSL upstream capacity. FRAMING AB-064R1 (S. Abbas, Centillium; J. Mueller, 3Com; K. Krishnan, Cirrus; K. Mirfakhraei, PC Tel) presents simulations to support the premise that framing efficiency and coding gain essentially provide the same performance advantages. AB-065R1 (S. Abbas, Centillium; C. Bourget, Nortel; J. Mueller, 3Com; K. Krishnan, Cirrus; K. Mirfakhraei, PC Tel) provides an analysis of framing mode and concludes that a reduced overhead, framing mode is necessary in G.lite. AB-066R1 (S. Abbas, Centillium; C. Bourget, Nortel; K. Krishnan, Cirrus; K. Mirfakhraei, PC Tel) proposes the text to implement the proposal made in AB-065R1. AB-067R1 (S. Abbas, Centillium; C. Hansen, Intel; J. Mueller, 3Com; K. Krishnan, Cirrus) proposes values of D = 1, 2, 4, 8, 16 for interleaver depth. AB-037 (G. Reina, Orckit, MOC Israel) suggests that 1-bit constellations can increase modem reach and available rate. It proposes text to incorporate this feature in G.lite. AB-068R1 (S. Abbas, Centillium; C. Hansen, Intel; J. Mueller, 3Com; K. Krishnan, Cirrus; K. Mirfakhraei, PC Tel) supports the one bit constellation as the smallest constellation supported by G.lite. AB-069 (A. Gal, National Semiconductor) proposes that the maximum number of check bytes be 8 in G.lite and that the FEC be common to G.lite and G.dmt. AB-071 (M. Tzannes, Aware) is a repeat of the proposal for a programmable framing mode that enables high efficiency and variable EOC/AOC (ADSL Overhead Channel) channel data rates made in Hawaii (as WH-083). FAST RETRAIN AB-033 (P. Silverman & R. Wang, 3Com) proposes that fast retrain in G.lite be examined in terms of the possible applications that need to be supported. It concludes that a fast retrain should be accomplished in about one second.

AB-099 (D. Van Bruyssel, Alcatel) proposes text that would allow an abort of a fast retrain. This was agreed. AB- 100 (D. Van Bruyssel, Alcatel) proposes text for the fast retrain procedures. It was also accepted. AB-101 (D. Van Bruyssel, Alcatel) provides simulation results which support proposals to: • Include trellis coding • Not include one-bit constellations • Specify one reduced overhead-framing mode There was a considerable discussion. The editor took a strong position on wanting little or no “options” in G.lite. The service providers strongly supported this optional feature.

PERFORMANCE REQUIREMENTS AB-095 (G. Zimmerman, PairGain, plus 10 companies) proposes some additional loops for G.test. The loops proposed are T1.601 loop 1, 2, 5, 7, shortened 7, 9, and 13. It also proposes bit-rate and noise models. AB-052 (R. Hamdi, Compaq) proposes the bit-rates and noise models for North American loops. AB-052R2 (R. Hamdi, Compaq) proposes two modified sets of performance requirements for Annex A, which removes the customer-premises wiring from consideration. Table 1 of AB-052R2 defines seven test mandatory cases which were all short loops (12000 and 13500 feet); Table 2 provides seven additional “extended reach” (longer loops) cases. There was considerable discussion about whether these performance criteria were in fact representative of actual installations. The need for at least one additional loop, which would address the longer reach, was raised as a concern by several companies. There was equally strong opposition from those who wanted a simpler (less complex) solution. There was also an expressed need for at least one home-wiring model. The test cases proposed in AB-052R2 were accepted as the basic set of criteria for G.lite Annex A with the understanding that there will be additional performance points added to Table 1 to address a single extended reach case and European loops as well as a home premises model. It was later agreed to add T1.601 loop 8 to Table 1 per AB- 052R3 (R. Hamdi, Compaq plus 21 other companies). AB-136 (N. Billington, BT, plus 6 companies) proposes European performance requirements for G.dmt and G.lite. It was agreed to add the performance requirements proposed in AB-136 with the hope that the number of test cases would be reduced. POWER MANAGEMENT AB-034 (P. Silverman & R. Wang, 3Com) concludes that the G.lite power management sections must: • Include specific recommendations regarding support for ATM and higher layer protocols • Address the cell rate decoupling and efficient synchronization of cell delineation • Define the criteria and interfaces to the higher layers for entering and leaving the Power Management modes, and • Be able to support the latency requirements of a variety of services. AB-072 (Max Lui, ITeX; R. Williams, 3Com) concludes that crosstalk during L0/L1 quiescent mode is not a limiting factor in bit rate and reach performance, and will only impact FEXT. AB-028 (F. Van der Putten & D. Van Bruyssel, Alcatel) raises some questions about the quiescent mode (power save state). It proposes that the Cell Delay Variation and the BER (Bit Error Rate) should be transparent to the upper layers. It raises questions whether OAM (Operation Administration and Maintenance) indicator bits should be transmitted during this state, whether noise margin should be maintained, if a low or zero data rate be supported, and if a loss of cell delineation be allowed when switching between the low and high data rates. AB-029 (D. Van Bruyssel, Alcatel) analyzes the quiescent proposal and recommends that the quiescent state not be allowed to be the source of pulsating crosstalk.

AB-082 (K. Cone, Lucent, plus 13 companies) addresses the open power management issues in G.lite. It proposes that the L2 state be mandatory, no other implementations of L1 should be considered, EOC commands for power management should be supported, and two new MIB entries should be defined to configure the time spent in the L2 state. It was agreed to use the EOC as specified in G.dmt and to make the L2 state mandatory (time not decided). AB-083 (K. Cone, Lucent) presents state diagrams for ATU-R and ATU-C power management. AB-135 (K. Cone, Lucent) is the output of an ad hoc group on power management which reached agreement on exchange entry, length of the exchange transition, resolution of the mandatory use of exchange for L1, L2 MIB issues, MIB reporting of link states and ATU-C shutdown. The proposal for two L1 states (L1a and L1b) however, was the source of a major debate. At the end it was decided to keep the present text (AB-008©) for L1, and keep this as an open item. AB-143 (K. Cone, Lucent, plus 7 companies) proposes the use of a modified expanded exchange sequence only on the first transition to L1 and that Fast Retrain be used for all subsequent transitions. There was a long discussion but no agreement was reached.

REFERENCE MODEM AND INTERFACES AB-054 (R. Hamdi, Compaq) proposes a system reference model and the functional blocks of a G.lite system. AB-081 (C. Hansen, Intel) proposes text from G.dmt for the section addressing the ATU input and output for ATM transport. It was agreed to use the ATM functional interface from G.dmt. AB-117 (T. Cole, AMD; Intel; R.R. Damm, Q6/16 Rapporteur; Compaq) proposes a logical PMD-TC interface. The text was accepted, subject to it being harmonized with G.ref. PAR REDUCTION AB-076 (D. Van Bruyssel, Alcatel) provides simulation results to support the claim that PAR reduction does not reduce the acoustical noise introduced into POTS devices. AB-102 (J. Carlo, TI) proposes that gi (gains information) assignment be redefined so that gi =0 not be assigned, therefore allowing the use of the unused tones for PAR reduction. This was accepted. AB-108 (A. Narula, Motorola) reviews the advantages of the Modulo-D PAR reduction technique, and proposes that the text changes suggested in WH-102 (which incorporate this technique) be accepted for both G.lite and G.dmt. OTHER ISSUES AB-038 (Y. Awata, Fujitsu) is a proposed revision to Annex C (Japanese TCM-ISDN) of G.lite, which changes text associated with Payload Transfer Delay, Rate Conversion and Fast Retrain. AB-105 (E. Cadorin, PC Tel) proposes that the total payload transfer delay be negotiated during the handshake/initialization phase and therefore not be specified in G.lite. It also supplies an alternative proposal where the delay would be split between the ATU-C and ATU-R with 1 ms for the ATU-C and up to 10 ms for the ATU-R. AB-105R2 (E. Cadorin, PC Tel plus 7 companies) differs from AB-105 by providing information on the effect the TCP protocol has on overall throughput delay. There was a long discussion, but no delay was agreed. AB-118 (J. Mueller, 3Com) proposes that R=16 (in the Reed Solomon coder) be mandatory in the transmitter and optional in the receiver. At a previous meeting this was agreed to be optional, but was left unstated as to how implemented. Although there was a long discussion, no agreement was reached. AB-104 (J. Carlo, TI) proposes the use of up- or downstream Trellis coding under ATU-C control. AB-107 (G. Forney, Motorola) reviews the benefits of trellis coding and proposes that it be included as an option in G.lite. AB-055 (N. Billington, BT) provides BT’s requirements for interworking between the ANSI Standard T1.413 Issue 2 and the ITU-T ADSL Recommendations. It was discussed at length. The service providers strongly backed this proposal which stresses compatibility between G.dmt, G.lite and T1.413 Issue 2. AB-098 (F. Van der Putten, Alcatel; G. Young, BT; J. Carlo, TI) proposes to restore the tone-based activation and acknowledgment as a continuation of the G.dmt and G.lite initialization after running G.hs. No agreements were reached. G.PLOAM A. Johansson (Ericsson) is the G.ploam editor. AB-009© and AB-019 (A. Johansson, Ericsson) are the G.ploam draft Recommendation and the Issues List, respectively. AB-125 (P. Silverman, 3Com) proposes that the U interface MIB (Management Information Base) have specific information for G.lite features, and that G.lite-specific information be defined in its own optional table in the U interface MIB rather than in a G.lite-specific MIB. AB-126 (P. Silverman, 3Com) proposes that only an SNMP (Simple Network Management Protocol) MIB be specified and that other interfaces such as the ‘AT’ interface not be defined as part of G.ploam. G.PLOAM AGREEMENTS • All points taken in G.hs will also be addressed in G.ploam • Use the definitions provided by the ADSL Forum

• Use four line states: Activated, Deactivated, Power down available, and Unavailable • MIB entries for: Timer in L2 power state, ATU-C initiate power down (L0 to L3), number of fast retrains, number of failed fast retrains, time in different power down states • Tx power object will include power cutbacks • Rates, Interleaved/Fast, Delay Link State, Errored Seconds, Severely Errored Second, Cell Loss Ratio and Cell Error Ratio are minimum set of management objects on T/S interface AB-121, the proposed work plan (A. Johansson, Ericsson) identifies the required issues to complete for Determination and what will be left for later. This was agreed as the game plan for the October SG15 meeting. The high priority items will be: • MO (Mobile Originated) in the Network Element • ATU-C and ATU-R MIBs across the U interface • Interaction with G.lite, G.hs & G.dmt G.TEST M. Tzannes (Aware) is the G.test editor. AB-010© and AB-020 (M. Tzannes, Aware) are the draft recommendation for G.test and the issues list, respectively. AB-035R1 (P. Kyees, Paradyne) proposes answers to some questions not resolved in the discussion of WH- 061R1 (P. Kyees, Paradyne) in Hawaii: • How many phones should be off hook during the off hook G.lite testing • How should modem performance be measured during off-hook transitions • How a modem recovers from returning to on-hook condition • The inclusion of the mixed crosstalk conditions to properly evaluate loop performance • How the types of impairments and impairment combinations apply to the various types of DSL AB-036 (P. Kyees, Paradyne) provides background and rationale for the set of loops agreed at the previous meeting (as WH-061R1) for G.test. AB-040 (S. Blackwell, Adtran) proposes that HDSL2 be considered as a possible interference source and presents the agreed PSD masks for HDSL2 as possible NEXT and FEXT sources for testing G.lite and G.dmt. AB-041 (B. Decker, S. Blackwell, Adtran) presents the impedance magnitude of both the telephones and the models. It also illustrates the group delay of both. AB-045 (K. Kikushima, NTT) is the revised WH-063 providing TCM-ISDN related tests for inclusion in G.test. The proposed draft is for both G.dmt and G.lite. AB-051 (R. Hamdi, Compaq) proposes some additional T1.601 test loops 1, 2, 5, 7, 9 and 13 for testing the G.lite system. AB-084 (D. McDonald, SBC, plus Ameritech, BellSouth, and PairGain) proposes PSD masks to be used for G.test. The FDM ADSL crosstalk model in this contribution was accepted. AB-122R1 (A. Reddy, K. Balemarthy & J.J. Werner, Lucent) proposes a model for a telephone. An ad hoc group developed a home-wiring model, which is a star configuration with three phones and an ATU-R attached to NIO (Network Input Output). One of the on-hook phones is connected by 160' cable to the NIO, a second on-hook phone and the ATU-R are connected by 10' bridge taps, 100' from the NIO. The third off-hook phone is connected to the same point on the NIO by 100' of cable (all cable is Cat 3 - 24 AWG). Quick agreement was reached on the linear phone model. The non-linear model however, was the subject of considerable debate over the need for such a model. It was finally decided to wait until the G.lite group identifies a need for a non-linear phone model. G.TEST AGREEMENTS • A star model will be used for home wiring. • The loops proposed in AB-095 (G. Zimmerman, PairGain, plus 10 companies) were accepted as the Annex A test loops. • The linear model proposed in WH-039 (S. Blackwell, Adtran) was accepted. A 730 Ω resistor in parallel with a 3100 µF capacitor and a 2000 Ω resistor in series will model the (off-hook) linear phone.

• The FDM ADSL crosstalk model in AB-084 (D. McDonald, SBC, plus Ameritech, BellSouth, and PairGain) was added. • The effect of Off-hook to On-hook transitions will be measured in terms of data rates and fast re-train times. G.HDSL S. Schmoll (Alcatel) is the G.991.1 (G.hdsl) editor. G.hdsl was Determined at the February 1998 SG15 meeting. AB-005 (D. Stuart, 3Com, Rapporteur) is the Draft Recommendation G.hdsl. It is scheduled for Decision in October. AB-022 (S. Blackwell, Adtran; G. Zimmerman, PairGain), a background paper, presents some of the major agreements from the ANSI HDSL2 work and the rationale behind them. AB-023 (S. Blackwell, Adtran; W. Guba, KE GmbH; J. Hausner, Siemens) provides a rationale for proposing that the ITU consider developing a Second-Generation HDSL Recommendation. This paper claims that an ITU Rec- ommendation would benefit equipment manufacturers, service providers and consumers. AB-039 (M. Kimpe, Adtran) summarizes the work underway in ETSI TM6 on a next generation HDSL system called SDSL (Symmetrical high bit rate Digital Subscriber Line). G.DMT S. Palm (Matsushita) is the G.dmt editor. AB-007R2© and AB-017 (S. Palm, Matsushita) are the draft Recommendation G.dmt and the issues list. AB-024 (S. Palm, Matsushita) is the proposed Work Program for G.dmt at this meeting. AB-043 (K. Kikushima, NTT) proposes a POTS splitter for deployment in Japan. It was accepted. AB-057 (K. Matsumoto, Sumitomo Electric plus 6 companies) proposes that the same PSD mask for FDM mode of Annex A (North American ISDN) and Annex C (TCM-ISDN, Japan) as specified in Annex F of T1.413 Issue 2 should be included in G.dmt for reduced NEXT. This was accepted. AB-058 (Y. Okamura, NEC, plus 6 companies) proposes text for Annex C. This contribution updates text agreed in Hawaii (July 1998) as WH-048. This was accepted. AB-086 (D. McDonald, SBC, plus BellSouth, Ameritech) updates the proposal for some of the sections in the text of Annex C. The major differences from AB-058 are Payload Transfer Delay and Rate Converter. AB-096 (K. Cavanaugh, Motorola; T. Starr, Ameritech; G. Young and K. Foster, BT) proposes that the set of activation tones described in T1.413 Issue 2 be included as an annex to G.dmt. AB-070 (S. Palm, Matsushita) identifies when the remaining open issues on G.dmt need to be closed. OTHER G.DMT AGREEMENTS: • Accept proposals in AB-031 (G. McAninch, GTE) to align sections A.4 and E.2 with the text in T1.413 Issue 2. • Accept the concept proposed in AB-055 (N. Billington, BT) which requests some additional loops and noise models more representative of Europe in Annex A or wherever appropriate. • Agreed on the title proposed in AB-015, G.gen: Suggested Titles for Recommendations (B. O’Mahony, Intel), “Digital Transmission System for Asymmetrical Subscriber Line (ADSL) Transmission on Metallic Local Lines, with Provisions to Facilitate Installation and for Operation in Conjunction with Other Services” • Accept PAR reduction proposal in AB-102 (J. Carlo, TI) G.HS L. Brown (Motorola) is the G.hs editor. AB-006© and AB-016 (L. Brown, Motorola) are draft Recommendation G.hs and the Issues List, respectively. AB-111 (L. Brown, Motorola) is the proposed work plan for this meeting. AB-025 (S. Palm, Matsushita, plus 6 companies) proposes modifications to G.hs (based on agreements from WH- 016). It includes general issues, modifications for Section 8 (Identification Field), examples of coding for the Standard Information Field and proposed modifications of transactions in Section 10.

AB-026 (S. Palm, Matsushita, plus 6 companies) reviews the upstream and downstream PSD requirements of xDSL services co-mingled with POTS and ISDN and proposes spectrum allocation for G.hs as well as modulation parameters. AB-030 (F. Van der Putten & P. Reusens, Alcatel) proposes text for the modulations section of G.hs and an allocation of carrier frequencies for each G.xDSL recommendation. AB-077 (F. Van der Putten & P. Reusens, Alcatel) discusses the concerns and issues associated with choosing the G.hs carrier frequencies for reliable use. AB-078 (B. O’Mahony, Intel) proposes a method for exchanging both standard and non-standard vendor IDs. It also proposes the use of a minimum set of code points to identify the various flavors of xDSL Recommendations. AB-079 (J. Mueller, 3Com; S. Abbas, Centillium; K. Mirfakhraei, PC Tel; J. Gleason, Motorola) proposes a set of tones for G.hs based on the 4.13125 kHz family (T1.413). AB-087 (B. O’Mahony, Intel) proposes that the decision on framing (octet-stuffed HDLC) be reconsidered to due possible problems now that DPSK modulation has been chosen for G.hs. AB-088 (B. O’Mahony, Intel) proposes timing diagrams for startup. AB-047 (S. Blackwell, Adtran) proposes that the 4K Band #1 (reserved for future use by HDSL2, SDSL, etc.) for G.hs be defined as 8 kHz to 32 kHz, but that no carrier frequencies be defined yet for that band. AB-075 (M. Tzannes, Aware) proposes negotiating the latency requirements using G.hs in order to optimize the performance of the R-S and interleaving parameters. AB-092 (V. Demjanenko, A. Torres, VoCAL Technologies) proposes a method of detecting the presence of load coils, and bridge taps on loops. AB-103 (K. Cavanaugh, Motorola) proposes an additional backup tone for overlapped spectrum. AB-089 (B. O’Mahony, Intel) provides a set of possible solutions to open items on which fast agreement might be possible. AB-116 (F. Van der Putten, Alcatel) is a report from an ad hoc that met to discuss G.hs activation. It proposes a startup time-line sequence for G.hs sectioned into a 200 ppm ATU-R clock tolerance and a 50 ppm ATU-R clock tolerance. This was accepted. AB-113 (B. O’Mahony, Intel) proposes a set of messages and transactions for inclusion in G.hs. This set was developed in ad hoc group discussions. It was accepted. AB-129 (C. Hansen, Intel) reports on the conclusions of an ad hoc group. AB-129 basically defines a general error recovery procedure using G.hs, defines the coupling of G.hs states and transceiver training signals, proposes a new C/R-ACT 1/2 signaling and C-tone signaling in G.hs, and includes appropriate state transition diagrams. It was accepted. AB-137 (T. Starr, Ameritech) is the output on the interoperability ad hoc group. It recommends that an Annex be added to G.hs which states that systems which support both G.dmt and T1.413 Issue 2 monitor for the appropriate T1.413 Issue 2 tones (R-ACK-REQ, C-ACT1-4, C-TONE), and if they are detected they should follow the procedures specified in T1.413 Issue 2. A direct reference to T1.413 Issue 2 will be included in G.hs. There was a concern raised in that this only involves detection of tones and not initiation of tones and therefore does not address the whole problem. However, it was accepted. AB-142 (K. Krechmer, MOC Israel for VocalTec) reports on the conclusions of an ad hoc group to specify the signals (tone sets based on T1.413 tones) for G.hs (Table 1). This was accepted and contributions were requested to address the concern raised during the discussion. OTHER AGREEMENTS • The gi values shall be in the range [-14.5,+2.5] dB but may be negotiated by G.hs • Will not include any level 2 or below Pars (G.hs parameters) in the standard configuration.

G.REF AB-109 (L. Humphrey, Nortel UK) proposes a number of reference models for G.ref. AB-004© and AB-014 (S. Abbas, Centillium as G.ref editor) are draft Recommendation G.ref and Issues List for G.ref, respectively. Dick Brandt, dB Consulting

upstream downstream G.dmt/G.lite-A 9 17 25 40 56 64 G.dmt-B 37 45 53 72 88 96 G.dmt-C/G.lite-TCM 7 9 12 14

Table 1. Signals Agreed for G.hs.

Q4/15 MEETING ROSTER, AUGUST 3 – 7, 1998, ANTWERP, BELGIUM Dick Stuart, 3Com Q4/15 Rapporteur Host: Alcatel 3Com Joe Mueller [email protected] 3Com Peter Silverman [email protected] 3Com Dick Stuart [email protected] 3Com Richard Williams [email protected] Adtran Steve Blackwell [email protected] Alcatel Stan Claes [email protected] Alcatel Sam D’Haeseleer [email protected] Alcatel Peter P.F. Reusens [email protected] Alcatel Danny Van Bruyssel [email protected] Alcatel Frank Van der Putten [email protected] AMD Terry Cole [email protected] Ameritech Tom Starr [email protected] Analog Devices Giri Amarakone [email protected] Analog Devices Doug Silveira [email protected] Aware Marcos Tzannes [email protected] Bay Networks Aleksandar Purkovic [email protected] BT Laboratories Nigel Billington [email protected] BT Laboratories John Geaney [email protected] Centillium Technology Syed Abbas [email protected] Centillium Technology Guozhu Long [email protected] Cirrus Logic Kanna Krishnan [email protected] Cisco Systems John Joyce [email protected] Compaq Computer Corp. Rabah Hamdi [email protected] Deutsche Telekom Ralf-Rainer Damm [email protected] Deutsche Telekom Gunther Zedler [email protected] DSC Communications Marcus Maranhao [email protected] ECI Telecom (Israel- MOC) Avi Ben-Zur [email protected] Ericsson Albin Johansson [email protected] ESS Technology Yuanjie Chen [email protected] ESS Technology Ping Dong [email protected] France Telecom - CNET DSE SDL Georges Sebek [email protected] Fujitsu Digital Technology Yutaka Awata [email protected] Fujitsu Ltd. Yasuhiro Arai [email protected] General Datacomm Yuri Goldstein [email protected] General Instrument/Next Level Comm. Sabit Say [email protected] GlobeSpan Semiconductor Marlis Humphrey [email protected] GTE Gary McAninch [email protected]

Hayes Microcomputer Products/CSR Elaine Baskin [email protected] IBM Zurich Res. Lab Sedat Oelcer [email protected] Integrated Telecom Express Max Lui [email protected] Integrated Telecom Express Dean Wang [email protected] Intel Corp Narjala Bhasker [email protected] Intel Corp. Barry O’Mahony [email protected] Intel Corp. Chris Hansen [email protected] Level One Communications Hanan Herzberg [email protected] Lucent - AGCS Subra Ambati [email protected] Lucent Technologies Kevin Cone [email protected] Lucent Technologies Rick Townsend [email protected] Marconi Communications Davide Pagnotta [email protected] Matsushita Graphic Comm. System Co. Stephen Palm [email protected] MCI Daryl Tannis [email protected] Mitel Corporation Silvana Rodrigues [email protected] Mitsubishi Electric Corp. Wataru Matsumoto [email protected] Motorola Dugerdil Bernard [email protected] Motorola Richard Brandt [email protected] Motorola Inc Sayfe Kiaei [email protected] Motorola ISG Les Brown [email protected] National Semiconductor Avi Gal [email protected] NEC Donavan Nak [email protected] NEC Corporation Yusaku Okamura [email protected] Nortel (Canada) Christian Bourget [email protected] Nortel (Europe) Les Humphrey [email protected] NTT, Access Network Systems Koji Kikushima [email protected] OKI Electric Industry Co. Ltd. Akihiro Takahashi [email protected] Orckit (MOC Israel) Guy Reina [email protected] PairGain George Zimmerman [email protected] Paradyne Bill Betts [email protected] Paradyne R.K. Smith [email protected] PC-Tel Khashayar Mirfakhraei [email protected] PC-Tel Enrico Cadorin [email protected] Pulsecom Dennis Rauschmayer [email protected] Racal-Datacom Chris Firth [email protected] Rockwell International Glen Griffith [email protected] Rockwell International Ilan Taler [email protected] Rockwell Semiconductor Systems Xuming Zhang [email protected] RSA Communications Inc. Raymond Chen [email protected] SBC Technology Resources Dick McDonald [email protected] SBC Technology Resources John Roquet [email protected] Siemens Paul Drugh [email protected] Siemens Neal King [email protected] Silicon Automation Systems Dasari Kumar [email protected] Silicon Automation Systems R. Venkatraman [email protected] Smart Link Ltd. Amir Ilevitzky [email protected] Sumitomo Electric Kazuya Matsumoto [email protected] Texas Instruments James Aslanis [email protected] Texas Instruments Jim Carlo [email protected] VoCAL Technologies Ltd Aberto Torres [email protected] VocalTec Communications (MOC Israel) Ken Krechmer [email protected]

ACRONYM DEFINITIONS AC alternating current ACTE Approvals Committee for Terminal Equip’t ADPCM Adaptive Differential PCM ADSL Asymmetric Digital Subscriber Loop (Line) AFNOR Association française de normalisation AL Answer List AM Amplitude Modulation AMPS Advanced Mobile Phone Service API Application Programming Interface APP Application Marker ARQ Automatic Repeat Request ASN Abstract Symbol Notation ATA Analog Terminal and Access Project ATM Asynchronous Transfer Mode ATU-C ADSL Transceiver Unit - Central Office End ATU-R ADSL Transceiver Unit - Remote Terminal BFT Binary File Transfer B/W Black and White C&I Commands and Indications CAP Carrier-less AM Phase Modulation CBPY Coded Block Pattern for Luminance CDH Cooperative Document Handling CDMA Code Division Multiple Access CDR Call Detail Recording CENELEC Commission Europeenne de Normalisation Electrotechnique CLI Calling Line Identification CLID Calling Line Identity CO Central Office CSN Circuit-Switched Network DCE Data Circuit Terminating Equipment DCME Digital Circuit Multiplication Equipment DCS Digital Command Signal (T.30) DCT Discrete Cosine Transform DECT Digital European Cordless Telephone DIS Digital Identification Signal DMIF DSM-CC Multimedia Integration Framework DMT Discrete Multi-tone Carrier DPSK Di-Bit Phase Shift Keying DSL Digital Subscriber Line DSM-CC Digital Storage Media - Command & Control DTC Digital Transmit Command DTE Data Terminal Equipment DTMF Dual Tone Multi Frequency DTS Definitive Telefax Standard EN European Norm EOC Embedded Operations Channel FCC Federal Communications Commission (U.S.) FCD Fast Track Committee Draft (ISO) FDM Frequency Division Multiplexing FEC Forward Error Control FECC Far End Camera Control FEXT Far End Cross Talk FSAN Full Service Access Networks GCC Generic Conference Control gi gains information GK GateKeeper GOB Group of Blocks (H.261, H.263) GSM Global System for Mobile Communications GW GateWay HDSL High-rate Digital Subscriber Loop IDCT Inverted Discrete Cosign Transform IEC International Electrotechnical Committee IESG Internet Engineering Steering Group IETF Internet Engineering Task Force IMD Inter Modulation Distortion IN Intelligent Networking IP Intellectual Property IP Internet Protocol ISDN Integrated Services Digital Network

ISDN-BA ISDN basic access ISO Inte’l Organization for Standardization ISUP ISDN User Part ITU International Telecommunication Union JBIG Joint Binary Image Group JPEG Joint Photographics Expert Group LS Lossless and near Lossless MCBPC Macroblock type & Coded Block Pattern for Chrominance MCS Multi-point Control Services (T.122) MIB Management Information Base MIME Multipurpose Internet Mail Extension MOS Mean Opinion Score MPEG Motion Picture Experts Group MRC Mixed Raster Content MSN multiple subscriber numbering NEXT Near End Cross Talk NIO Network Input Output NPRM Notice of Proposed Rule Making (FCC) NTP Network Termination Point OID Object Identifiers OSI Open System Interconnection PACC Partition, Aggregation & Conditional Coding PAM Pulse Amplitude Modulation PAR Peak to Average Ratio PDAM Proposed Draft Amendment PLOAM Physical Layer Operations, Administrations and Maintenance POTS Plain Old Telephone Service PSTN Public Switched Telephone Network QAM Quadrature Amplitude Modulation QoS Quality of Service RAS Registration, Admission, and Status RCPC Rate Compatible Punctured Convolutional RDC Remote Device Control RFC Designation for an Internet Standard RS Reed-Solomon (code) RVLC Reversible Variable Length Codes SCN Switched Circuit Network SDH Synchronous Digital Hierarchy SDSL Symmetrical high bit rate DSL SGCP Simple Gateway Control Protocol SNR Signal to Noise Ratio SPIFF Still Picture Interchange File Format SS7 Signaling System 7 TCF Training Check (T.30) TCM Time Compression Multiplex TCP Transmission Control Protocol TIFF Tagged Image File Format TIPHON Telecommunications and Internet Protocol Harmonization Over Networks (ETSI Project) TMN Telecommunications Management Network TPS Transport Protocol Specific TRAC Technical Rec. Application Committee TSAG Telecom. Standardization Advisory Group TSB Telecom. Standardization Board (ITU) TSB Telecommunications Systems Bulletin (TIA) UDP User Datagram Protocol UEP Unequal Error Protection UMTS Universal Mobile Telecommunications System UNI User-Network Interface UPT Universal Personal Telecom. (CCITT) VDSL Very high speed ADSL VLC Variable Length Codeword VoIP Voice Over Internet Protocol VTU-R VDSL Transceiver Unit - Remote Terminal W-CDMA Wideband CDMA

1998 STANDARDS COMMITTEE MEETING SCHEDULES AS OF AUGUST 26, 1998 Subject to Change without Notice Committee Date(s) Location Committee Date(s) Location T1E1 Aug 31-Sept 4 San Antonio, TX Q15/16 Rapporteurs Nov 3 - 6 Korea ETSI TIPHON Aug 31-Sept 3 Portland, OR TR-29 Nov 9 - 13 Arlington, VA TR-30.3 Sep 9 - 10 Riverside, CA TR-30 Nov 9 - 13 Clearwater, FL SG 16 Sep 14 - 25 Geneva, Switzerland ETSI DTA Nov 16 - 18 Berlin, Germany ETSI TM6 Sep 21 - 25 Vienna, Austria TR-41 Nov 16 - 20 Palm Springs, CA TR-41.8.1 UTP int. Oct 1 - 2 Montreal, PQ Q11-14/16 Rapp. Nov 17 - 20 Torino, Italy SG 15 Oct 12 - 23 Geneva, Switzerland ETSI TM6 Nov 23 - 27 Sophia Antipolis, Fr ETSI TIPHON Oct 26 - 30 Israel T1E1 Nov 30-Dec 4 Texas Q1/8, Q3/8, Q4/8 Nov 2 - 6 UK ETSI ATA Dec 7 - 11 South Africa Rapp.

1999 STANDARDS COMMITTEE MEETING SCHEDULES AS OF AUGUST 26, 1998 Subject to Change without Notice

Committee Date(s) Location Committee Date(s) Location Q11 & 15/16 Rapp January --- TR-30 Jun 14 - 17 California ETSI TIPHON Jan 11 - 15 S. Antipolis, FR ITU-T SG15 Jun 21-Jul 2 Geneva TR-30 Feb 8 - 11 --- Q15/16 Rapp. July --- TR-41 Feb 15 - 19 --- ETSI TIPHON July Manchester, UK ETSI TM6 Feb 22 26 Tel Aviv, Israel TR-30 Aug 9 - 12 Quebec City, PQ Q13/16 Rapp. Feb 23 - 26 USA TR-41 Aug 16 - 20 --- ETSI TIPHON March New Jersey, USA T1E1 Aug 22 - 23 --- T1E1 Mar 8 - 12 --- ETSI TM6 Sep 20 - 24 UK ITU-T SG8 Mar 24-Apr 4 Geneva TR-30 Oct 11 - 14 Baltimore, MD TR-30 Apr 12 - 15 --- Q15/16 Rapp. November ITU-T SG 16 Apr 19 - 30 Geneva TR-41 Nov 8 - 12 --- ETSI TIPHON May Belgium TR-30 Nov 29-Dec 2 --- ETSI TM6 May 3 - 7 Grenoble, France ETSI TM6 Nov 29-Dec 3 Netherlands TR-41 May 17 - 21 --- T1E1 Dec 6 - 10 --- T1E1 Jun 7 - 11 ---

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Communications Standards Review –Telecommunications (ISSN 1081-4655) is published 8 - 9 times per year, within days after the latest, related standards meetings. Editor: Elaine J. Baskin, Ph.D. Technical Editor: Ken Krechmer. Copyright © 1998, Communications Standards Review. All rights reserved. Copying of individual articles for distribution within a subscriber organization is permitted. Subscriptions: $695.00 per year worldwide, $795.00 in electronic format. Corporate Intranet subscriptions (site license for multiple copies) are available. Submit articles for consideration to: Communications Standards Review, 757 Greer Road, Palo Alto, CA 94303-3024 U.S.A. Tel: +1-650-856-9018. Fax: +1-650-856-6591. e-mail: [email protected]. WWW: http://www.csrstds.com. 19906