CSR-T Volume 9 #2, March 1998

COMMUNICATIONS STANDARDS REVIEW TELECOMMUNICATIONS

Volume 9, Number 2 March 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.

ETSI Analogue Terminals and Access (ATA) meeting, December 16 – 19, 1997, Salzburg, Austria...... 2 ATA Meeting Roster, December 16 – 19, 1997, Salzburg, Austria...... 5 ETSI TM6 Transmission And Multiplexing Technical Committee Meeting, January 26 – 30, 1998, Madrid, Spain.6 VDSL...... 6 ISDN-BA (ISDN Basic Rate Access)...... 8 ADSL...... 9 HDSL...... 10 ITU-T Study Group 16, Multimedia, January 26 – February 6, 1998, Geneva, Switzerland...... 11 Decided Recommendations of SG16...... 11 Determined Recommendations of SG16...... 12 SG16 General Issues...... 13 Q1/16 WP2, Audiovisual/Multimedia Services...... 15 Q2/16 WP2, Interactive Multimedia Information Retrieval Services (MIRS)...... 17 Q3/16 WP2, Data Protocols for Multimedia Conferencing...... 17 Q4/16 WP1, Modems for Switched Telephone Network and Telephone Type Leased Lines...... 19 Q5/16 WP1, ISDN Terminal Adapters, and Interworking of DTEs on ISDNs with DTEs On Other Networks...... 20 Q6/16 WP1, DTE-DCE Interchange Circuits...... 20 Q7/16 WP1, DTE-DCE Interface Protocols...... 22 Q8/16, WP1 DCE/DCE Protocols...... 23 Q9/16 WP1, Multimedia Aspects of Special Interest to People With Disabilities...... 24 Q10/16 WP1, Modem Testing...... 25 Q11/16 WP2, Circuit-Switched Network (CSN) Multimedia Systems and Terminals...... 25 Q12/16 WP2, B-ISDN Multimedia Systems and Terminals...... 27 Q13/16 WP2, Packet switched multimedia systems and terminals...... 29 Q14/16 WP2, Common Protocols, MCUs and Protocols for Interworking with H.300-series Terminals...... 33 Q15/16 WP3, Advanced Video Coding...... 36 Q16/16, Harmonization of Multimedia Systems, Applications and Services...... 40 Q17/16, AVMMS Coordination...... 40 Q18/16 WP1 Interaction of High Speed Voiceband Data Systems with Signal Processing Equipment in the GSTN...... 41 Q19/16 WP3, Extension to Existing ITU-T Speech Coding Standards at Bit Rates Below 16 kbit/s...... 42 Q20/16 WP3, Audio and Wideband Coding in Public Telecommunication Networks...... 44 Q21/16 WP3, Encoding of speech signals at bit rates around 4 kbit/s...... 46 Q22/16 WP3, Software and Hardware Tools for Standardization of Speech and Audio Coding Algorithms...... 47 Q23/16 WP1, A Compatible Pair of High Speed Modems, One Digital, the Other Analog, For Use Together on the PSTN (PCM Modem)...... 50 SG16 Meeting Roster, January 26 – February 6, 1998, Geneva, Switzerland...... 51 Acronym Definitions...... 54 1998 Standards Committee Meeting Schedules as of March 6, 1998...... 56

March 1998 Vol. 9.2 Copyright © CSR 1998 1 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS REPORT OF THE THIRD ANALOGUE TERMINALS AND ACCESS (ATA) MEETING, DECEMBER 16 – 19, 1997, SALZBURG, AUSTRIA Note: ETSI documents are no longer available through the CSR library. N. Encarnaçao (OFCOM) is the ETSI ATA Chair. Time was given to rather political discussions on the Technical Basis for Regulation (TBR) 21 (Public Switched Telephone Network [PSTN] Non-Voice Terminal Equipment) and its associated guides, ETSI Guide (EG) 201 120, Installation Guide for PSTN Terminals, and EG 201 121, the Analog Technical Ad hoc Advisory Board (ATAAB) Advisory Notes for TBR 21. There were still concerns and problems for those countries who voted yes in the first vote and so were not allowed to have any Advisory Notes. TD 25 (ETSI Secretariat) contains the results, including all ballot comments, of a recent National Vote on TBR 21, and a Membership Vote on prEG 201 120 (PSTN; Method of rating terminal equipment so that it can be connected in series and/or in parallel to a Network Termination Point) and on prEG 201 121 (A guide to the application of TBR 21). The vote on TBR 21 was successful in its second attempt. The document will be published by ETSI when requested by the European Commission. TD 28 provides editorial comments to prEG 201 120 and prEG 201 121 from Switzerland and Telefonica. With the resolution of these comments, EG 201 120 and EG 201 121 were both approved by ETSI ATA. TD 29©, a draft ETSI TR, provides definitions, abbreviations, and symbols as used by ATA (Analogue Terminals and Access). TD 03 (ETSI ATA Chair) contains he forecast of Work Item progress indicating that most work is ahead of schedule. APPOINTMENT OF OFFICIALS J. Fenn will be unable to continue as liaison for Global Multimedia Mobility (GMM). There is still a need for liaison to Multimedia Terminal and Applications (MTA) and Transmission and Multiplexing (TM). There was a complaint from J. Long (DTI) about the lack of contact with the ElectroMagnetic Compatibility (EMC)/Safety liaison officer (A. Mullan, Motorola) who had not attended the last two meetings. B. Martensen (Ericsson) was appointed Rapporteur for a multiline work item; C. Gandyra (BABT) was appointed Rapporteur for loop disconnect; R. Ceruti (CSELT) was appointed Rapporteur for sending level limitation. A comment was made that such appointments should not have been made until after the work item had been approved. INFORMATION FROM ETSI The ETSI server has been revised and improved. Plans were reported for ETSI Tenth Anniversary celebrations. The Chairman is drafting a presentation of ATA work. Members are invited to contribute. NEW WORK ITEMS • TD 18 (ETSI ATA Chair) is a new work item for an ETSI Standard (ES) for terminals to be connected to the PSTN via more than one 2 or 4 wire interfaces (PSTN and leased line); B. Martensen (Ericsson) will be the Rapporteur. It was approved with minor revision. • TD 20 (ETSI ATA Chair) is a new work item for an ES to specify decadic dialing requirements for 2 wire PSTN terminals. There was considerable opposition to this work item. Some members thought it a political attempt to slip harmonized requirements for loop disconnect signaling into TBR 21 through the back door. A vote in support of this new work item was taken which initially just failed. In view of opposition from Germany, Italy, Norway and Spain, the DTI representative (J. Long, UK) declared that his government would consider the lack of such a standard as a restraint to trade and the free movement of goods in the Community. After some discussion, one no vote was changed to an abstention and the work item was declared provisionally approved, subject to a pending revision in the scope to change the references from “decadic dialing” to “loop disconnect.” TD-35© is the first draft. P. Erasmus (Telkom S.A.) will be the Rapporteur; T. Anvoner (C&W Com) agreed to assist him. P. Erasmus is the first South African Rapporteur for ETSI. • TD 30 (ETSI ATA Chair) is a new work item proposing a Technical Report on using a pseudo-speech signal as the test stimulation for testing PSTN terminals voice level limitation requirements. The work item was provisionally approved subject to confirmation after a revised scope is written and placed on the ETSI server. 2 Vol. 9.2 Copyright © CSR 1998 March 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS

RELATIONS WITH OTHER BODIES N. Encarnaçao (ETSI ATA Chair) reported that he had made brief contact with A. Mullan (Motorola) on the problem of reporting safety issues from Commission Europeenne de Normalisation Electrotechnique (CENELEC) and hoped to receive some information shortly. It was noted that future safety and EMC liaison would be with ETSI committees on EMC and Radio spectrum Matters (EE2 [Environmental Engineering - power supply] / ERM [EMC Radio spectrum Matters]), and that direct contact with CENELEC would no longer be necessary. TD 26 (ETSI ATA Chair) notes the Board decision that ETSI Environmental Engineering (EE) should support the maintenance of ETS 300 046 ISDN (Primary rate access - safety and protection) and 300 047 ( ISDN basic access - safety and protection). TD 12© (France Telecom) is a liaison from NA 2 (Network Aspects, numbering, addressing, routing & internetworking). It contains the draft of a report on PSTN display services, and provides the list of information that can be sent with PSTN supplementary services using V.23 data modem transmission. ATA members were invited to comment to the Chairman by January 22, 1998. When the report is completed in September 1998, ATA will be expected to specify appropriate coding. No liaison had been received from DTA on the use of the Terminal Support Interface in Digital Terminal Adapters. R. Trevland (NPT) reported that ETSI TM 3 (Transmission and Multiplexing, interfaces, architecture and functional requirements of transport networks) had expressed concerns on this work item. TD 17© (ETSI) is a draft ES (physical layer issues only) for terminals to be connected to the PSTN via more than one 2 or 4 wire interfaces. B. Martensen (Ericsson) produced TD 17 with the assumption that the work item would be approved. This draft proposes crosstalk and insulation requirements between two terminal connection points. The new scope for this work, which was approved at this meeting, is contained in TD 36 (ETSI ATA Chair). WIRE ANALOGUE VOICE BOARD INTERFACES TD 31© (ETSI) is a draft report on 2 Wire Analogue Voice Band Interfaces. The draft was produced by the ETSI ATA Chairman in anticipation of the acceptance of the work item (TD-18), and is based upon TD 27 (R. Ceruti, CSELT). TD 27 applies the test simulation for level limitation requirements to TBR 21 and TBR 37. The ETSI ATA Chairman hoped that the report could be agreed during the meeting, but concern was expressed by C. Karlsson (Telia) as members had not had time to study the figures and others agreed. J. Long (DTI) expressed concern that TD 31© was overly complicated and objected to the use of Loudness Ratings in the requirements. It was suggested that TD 31© was more confusing than TD 27 from which it was derived. F. Howett (Nortel) had concerns about clause 5 on Terminal Equipment (TE) without acoustic transducers, pointing out that the proposed test methods were not in line with existing practice and required further study. TD 31© was updated during the meeting; further review will take place by correspondence. The ETSI ATA Chairman continued pressing the work forward; it was agreed that final acceptance of the document by the ATA membership should also be by correspondence. TBR38, PSTN TELEPHONY APPLICATTIONS TD 14 (ETSI ATA Chair) lists the national comments received from the public enquiry of TBR 38 (General terminal attachment requirements: PSTN telephony applications). TD 23 (J. Dolidet, Matra Communication) provides additional explanation of the French comments. Most of the comments were editorial in nature and could readily be resolved. It was agreed that it was preferable for the medium current tests to be performed at the middle current rather than using a middle value of feed resistance; therefore, the test resistance values of 1600 ohms were changed to 1000 ohms throughout the document. There were a number of Norwegian comments on the applicability of the requirements over the full range of test currents. Additionally there were comments from Germany, Italy and the UK opposing testing at very low currents with a feed resistor of 2800 ohms. TD 24 (Telia) provides loop currents on the Swedish system and justifies a 2800 ohm test. The contribution was intended for TBR 37 but was equally applicable to the discussion on low current testing. On the one hand it was pointed out that many complex telephone terminals could not operate correctly with 2800 ohm feeds; on the other

March 1998 Vol. 9.2 Copyright © CSR 1998 3 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS hand, many lines in Sweden and in some other countries had feed resistances effectively greater than 2300 ohms (the proposed relaxation). The Convenor (W. Mellors, WM Services) was eventually able to negotiate a compromise solution which permitted terminals supporting a handsfree or loudspeaking function to be tested at 2300 ohms instead of 2800 ohms, but with a warning that they may not operate correctly on some lines. TD 15 (ETSI ATA Chair) contains a record of the disposition of all of the public enquiry comments on TBR 38. At the final plenary, some editorial errors were found in the updating of the document (TD 38©) and TBR 38 was provisionally approved subject to the resolution of any comments arising from the editorial corrections. TD 39 (ETSI ATA Chair) contains the amendments necessary to I-ETS 300 677 (the voluntary standard on handset telephony) to align it with the decisions on TBR 38. With these amendments the document was approved to go forward for membership approval as ES 200 677. TBR 21, PSTN TERMINAL EQUIPMENT TD 16© (ETSI) is a draft of TR 101 150, a report written by J. Long (DTI) on the application of TBR 21. Topics include the interpretation of the scope of TBR 21, its relationship with TBR 37 and TBR 38 and the possibilities of convergence of access requirements for voice and non-voice equipment (merging of TBR 21 with TBR 37). TD 16© has considerable political implications and was supported by the Chairman who commended its value. The report includes lists of the countries applying prTBR21, the specific fields of application and with what deviations (60mA limit and minimum loop current most often). The report also notes that some countries intend using TBR 38 in conjunction with TBR21 as soon as TBR 38 is approved by ETSI. TD 16© (ETSI) recommends holding the completion of TBR 37 until the European Commission has settled the problems of the perceived overlapping scopes of TBR 21 and TBR 37 which arises largely from differing interpreta- tions of the voice telephony justified case. An updated version of the report will be placed on the server and it will be submitted for ETSI ATA approval by correspondence. TERMINAL SUPPORT INTERFACE GUIDE TD 13© (ETSI) is the first draft of the Terminal Support Interface for analogue PSTN terminals Guide, produced by F. Howett (Nortel). This gives guidance on a device incorporating an interface for the connection of harmonized analogue PSTN terminals to 2 wire, 4 wire or digital networks. F. Howett requested that members consider the parameters that had been identified in the document rather than their values which were based on UK experience. DISTINCTIVE RINGING TD 33 (P. O’Keefe, Telecom Eirann) is a progress report on distinctive ringing. TD 34© (P. O’Keefe, Telecom Eirann) contains the first draft of the document. The objective of this TR is to detail all ringing signals in use and planned for introduction throughout Europe. Minor suggestions for improvement were made and it was agreed to add a reference to call completion to busy subscriber and distinguish it from ring back when free. The Rapporteur, P. O’Keefe (Telecom Eirann), expects to put a new draft on the server by the end of February 1998. TBR 37, PSTN VOICE ACCESS TD 37 (C. Harley, BT) presents discussions on TBR 37 at the Rapporteur’s session before the ETSI ATA meeting. The session had dealt with a number of TDs that contained inputs to the work, particularly TD 11 (F. Stafsnes, Te- lenor) on instantaneous voltage; TD 21 (Telefonica) containing various Spanish comments; TD 24 (Telia) providing details of loop currents on the Swedish telephone system; and TD 27 (R. Ceruti, CSELT) on sending level limitation requirements.

TD 27 (R. Ceruti, CSELT) discusses sending level limitation requirements for voice terminals in TBR 37 (PSTN Voice Access). The proposals are based on speech levels given in ITU-T Recommendation G.115 and provide test methods for speech signals. There was some dispute over whether the activity factor should be quoted as 28% or 44%, but it was agreed that the difference was a result of the use of an SV 6 (speech voltmeter).

OTHER HIGHLIGTS In spite of pressure from the ETSI ATA Chair, it was agreed that it would be too early to hold an ETSI ATA meeting in March 1998. The next meeting of ATA was set for June 22-26 in Stockholm, Sweden. A conventional technologies working group meeting will be held in Sophia Antipolis from March 30 - April 3, 1998 to discuss the ES on definitions, EG on the interface for PSTN terminals, the ESs on loop disconnect, multiline and Dual Tone Multi Frequency (DTMF), and TBR 37. The report on ringing cadences will not be discussed. The date of the resolution meeting on EN 301 071-1 (adaption of existing ADSI specification to European network requirements) has not yet been fixed as the Rapporteur (B. Hansen, Nortel) has been too busy to deal with the large number of comments. Walter J.G. Mellors, WM Services

ATA MEETING ROSTER, DECEMBER 16 – 19, 1997, SALZBURG, AUSTRIA Nuno Encarnaçao, OFCOM ETSI ATA Chair Austria Netherlands Austria Telekom Werner Helm KPN J.J.C Salemans Austria Telekom Gustav Magdoin KPN Bert van Leerdam Austria Telekom Friedrich Seiringer Norway Czech Republic Comlab G. Suhanthakumar Tetcom Zdenek Gutter NPT Jan Nergard Denmark NPT Rasmus Trevland NTA Helene Jensen Telenor Finn Stafsnes Germany Spain BAPT Christina Gandyra Telefonica Enrique Carrasco CETECOM Mattias Geier Sweden Deutsche Telekom Werner Schellhaas Ericsson Berndt Martenson Deutsche Telekom Stefan Wust Telia Christer Karlsson Siemens Stan Willemsen Switzerland France Swisscom Konrad Gysi Alcatel Jean-Marie Notter OFCOM Nuno Encarnacao ETSI Claire d´Esclercs UK France Telecom Jean-Yves Monfort BABT Alan Penney HP France Ingrid Rajaomanana BT plc Chris Harley Matra Jean-Francis Dolidet J C & W Com. Plc Tony Anvoner Finland DTI John Long Finnet Kaj Andersson Nortel Fred Howett Tel.Adm.Cent. Antero Saarinen OFTEL Martin Harris Ireland WM Services Walter Mellors Telecom Eireann Pat O’Keeffe Zaire Italy Telkom S.A Pieter Erasmus CSELT Rodolfo Ceruti Telkom S.A. Maritz Triegaardt

March 1998 Vol. 9.2 Copyright © CSR 1998 5 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS REPORT OF ETSI TM6 TRANSMISSION AND MULTIPLEXING TECHNICAL COMMITTEE MEETING, JANUARY 26 – 30, 1998, MADRID, SPAIN Note: ETSI documents are no longer available through the CSR library. H. Frizlen (Ericsson) is the ETSI TM6 STC Chairman. TD-02 contains the work status of TM6 work items; TM6 has relatively few work items but they have broad interest. WD-01 provides Work Program Sheets for two new TM6 ADSL work items: • Provision of an Annex to Version 2 of T1.413 Containing the European Requirements Regarding the Extension of Bit Rates • European Requirements for the Coexistence of ADSL and ISDN Basic Rate Access on the Same Pair and Extended DSL Bit Rates. The outcome of this work may result in a revision of ETR 328 and/or a new annex for version 3 of ANSI T1.413. MEETING SUMMARY: GENERAL TM6 ISSUES • TS 152 (Technical Standard on HDSL, previously ETR 152) was approved. It had been partially rejected by TM, the supervising body of TM6. • It was decided to publish a revision to ETR 80 (ISDN Basic Rate). • DTS on VDSL Part 1 was approved; ways to proceed both for a revision of Part 1 and creation of Part 2 were agreed. • It was agreed how to proceed on ADSL with the fact that ADSL version 2 is close to completion in T1E1. • VDSL rapporteur replacement: –B. Warring (Lucent Technologies) replaced K. Foster (BT) –N. Combey (Texas Instruments) replaced M. Bryan (Westell, UK) as editor of the VDSL documents –H. Zoeteman (Lucent, Netherlands) is resigning as ISDN BA rapporteur). VDSL

VDSL DTS PART 1 VDSL Part 1 (Functional Requirements) DTS (Draft Technical Standard) has gone through TM6 voting; TD-09 contains the results of the vote; the detailed technical comments are in TD-43 and detailed editorial comments are contained in TD-10. While the weighted votes would suffice to gain approval of the document, TM6 Chairman asked the Rapporteur to resolve the issues of the two negative votes from DTAG (Deutsche Telecom) and Ericsson. TD-37 (Deutsche Telekom AG) offers comments on the Ericsson objections as some Ericsson comments focused on definitions in the DTS that are based on Deutsche Telecom proposals. Some delegates indicated that some of their comments were classified as editorial while they are in fact technical in nature. A detailed discussion followed. Classes of VDSL applications, and asymmetric Upstream/Downstream versus short/long range were discussed. TD-45 (Return Loss Specification, in relation to the Splitter specs) and WD-02 (Ad-hoc group “Splitter Filter”) are the conclusions of a small working group on impedances, reflection coefficient points of measurement, splitter design, and whether the transceiver should include the high pass filter. It seems that the splitter may either be internal to the terminal equipment or external. It was agreed that DTS Part 1 should not give values for impedance and reflection and should delete chapter 12 (splitter), noting the issue for further study. Regarding power spectrum density and maximum transmit power: the group discussed whether the 300 kHz “brick wall” should be replaced by a transition as the proposed mask is wasting useful bandwidth. The meeting finally agreed to leave the 300 kHz brick wall but also to label it for further study for Part 1, Edition 2 of the VDSL DTS. TD-20 (P. Reusens, Alcatel, Belgium) gives some insight into the latency vs. noise burst length (250 µs/10 ms or 500 µs/20 ms?) problem on forward error correction. Noise models is one of the main issues for the no vote of DTAG (Deutsche Telecom). They would like to see the addition of two new noise models representing the disturbances of ISDN Primary Rate Access on nearby pairs. Ger- many has the largest ISDN installed base; the meeting agreed to create two noise models C and D; model C is the addition of uncorrelated noise corresponding to model A plus the ISDN PRA noise, while model D is the addition of model B noise to the ISDN PRA noise; it was also agreed that all combinations of noises be added in Tables 8 and 9 as proposed in WD-03, and that each operator may select its particular cases depending on its network and its applications. With this change, DTAG changed its no vote to a yes vote.

A few technical comments that were placed in TD-10 (editorial) by error were also discussed: • Should the filters be passive only and not active as the text suggests? • Symmetry tests should be applicable to any “exposed” interface of the VDSL model. • Adjustment of power level should be rephrased. • Programmability of notch filter (to reduce Radio Amateur disturbances) is desirable. • Power down definition and low power definitions should be rephrased. TM6 approved DTS/TM-06003-1 (VDSL-Part 1: Functional Requirements). It appears, however, that this work was approved due to the deadline. There are still a number of items for further study which would make it difficult to design equipment based on this DTS. This Part 1, Edition 1 (DTS/TM-06003-1 (draft) V0.0.7 (1998-1) will be sent to T1E1. At the same time the VDSL Part 1, Edition 2 work will be started with a target date of February 1999 for publication; a new living list was created. VDSL PART 2 H. Frizlen noted that there are at least two interest groups represented within TM6 (the VDSL Alliance [DMT] and the VDSL Coalition [CAP/QAM]), and that he would like to find a technical consensus that is acceptable to all. TD-04, VDSL Line Coding, Modulation and Duplexing Method Based on Single-Carrier Technology, and TD-05, VDSL Transmission Convergence Sub Layer, were tabled by the VDSL Coalition (represented by B. Warring, Lucent Technologies). TD-06 is a copy of a T1E1 VDSL working draft specification, Document T1E1.4/97-168R2. TD-28, VDSL Alliance DMT VDSL Draft Standard Proposal, was introduced by K. Jacobsen (Amati). These documents are copies of the T1E1 presentations and were not discussed by TM6. The TM6 Chairman noted two possible scenarios, one of taking the T1E1 document once it is approved and adapting it for Europe, the other to be contribution-driven and prepare a Technical Report comparing the different proposals and establishing common elements. The latter proposal was agreed. It was also proposed to set up a common laboratory to evaluate the different proposals; the tests would consist of harmonized test suites that could allow fair comparisons of the different solutions; TM6 members were asked to propose their test labs to progress the test work (preferably but not necessarily Telecom Operators). TD-07, An Introduction to Blind Equalization (L. Garth et al, Lucent Technologies), is a tutorial and was presented for information. TD-31, Implementation Complexity of FFT (Fast Fourier Transform) Processor for Zipper-VDSL (D. Mestdagh et al, SGS-Thomson), was presented for information. It was presented at T1E1.4 in December 1997, and provides an estimate of the .25 µm CMOS implementation size/power of FFT processors for the generation of DMT signals composed of 1024 (2.6mm2/ 415mW), 2048 (4.2mm2/575mW) or 4096 tones (6.4mm2/695mW), recommending the 2K FFT. Line Coding, FDD vs. TDD, Clock Recovery TD-18, Proposal for locking the TDD frame to the network clock (introduced by P. Reusens, Alcatel-Belgium), establishes requirements for frame synchronization in different cabinets and shows how a framing signal derived from the SDH clock can meet the requirements. TD-21, Advantages of Data Aided Multi-Carrier Based Timing Synchronization (introduced by P. Reusens, Alcatel- Belgium), indicates that the use of a randomized pilot tone gives better results in FDD than a single pilot tone which can itself be disturbed. TD-22, Flexibility of VDSL deployment with Time Division Duplexing (TDD) (P. Reusens, Alcatel-Belgium), develops the advantages of TDD with respect to FDD (frequency division duplex) in VDSL: TDD allows change of the Upstream/Downstream ratios by software; this is not possible with FDD. TDD uses the full bandwidth in each direction and is silent during reception which reduces the disturbance to other wire pairs. In TD-42 (L.D. Humphrey, Nortel), Nortel notes that TDD DMT seems to be workable and among the best solutions for VDSL.

Activation/Deactivation TD-15 (P. Reusens, Alcatel Belgium) discusses possible handshaking procedures, noting work on G.hs, at start up for both modems to exchange their parameters. It suggests a PSK rather than FSK modulation to provide better compatibility with existing xDSL approaches and greater noise immunity. TD-19, Upstream Power Cut-Back needed for solidarity between VDSL modems distributed in separate wire pairs along a cable (introduced by P. Reusens, Alcatel-Belgium), gives some insight in the necessary solidarity between modems; it recommends that the VDSL modem go to low power modes when inactive to protect the other VDSL modems and to ensure their best transmission environment; results show that this is particularly true for the modems closest to the exchanges. Cable Reference Models; Noise Studies TD-48 (F. Pythoud, Swisscom) provides the Swiss cable reference model which will be included in the permanent document on European Cable Models. TD-08 (J. Musson, Marconi Italy) shows that the classical R,L/G,C cable model may lead to some modeling difficulties in the time domain and suggests using the s-quadripole parameters approach which seems to give better results. TD-27, Potential for Interference Between ADSL and VDSL (K. Jacobsen, Amati), is part 2 of a continuing study first presented at the Verona meeting (November 1997). Basic conclusions of this well-done study are that the ADSL NEXT degrades Upstream VDSL substantially and that ADSL FEXT degrades Upstream VDSL to a lesser degree. TD-27 raises several questions: Can operators predict in which mix their ADSL/VDSL resides in the Central Office or in the Customer Premise area? Is power boost of VDSL below 2 MHz feasible? TD-30, The Achievable Capacity of First-Generation FDD Symmetric VDSL Under the FSAN (Full Service Access Network) Noise Model (B. Porat, Savan Israel, and D. Schmücking, Siemens Austria), gives results of simulation for VDSL Systems that are FDD, bit rate symmetric and intended for medium to long ranges (700 to 1000 m). The FSAN model which includes the influence of ISDN PRA is particularly harmful to VDSL for ranges above 700 m (without PRA bandwidth of 10 to 12 MHz, with PRA degradation of 2 to 3 MHz in bandwidth). The TM6 Chairman asked the new VDSL Rapporteur B. Warring to hold these contributions for Part 2 and for the VDSL Technical Report. LIAISONS FROM OTHER BODIES TO TM6 TD-13 (L.D. Humphrey, Nortel) is a liaison from TM3 which requests comments from TM6 on new text for the ATM transport over xDSL. H. Frizlen noted that both of the T1E1 liaison officers from T1E1 were not present, and asked US delegates to prepare a report of T1E1 activities. ISDN-BA (ISDN BASIC RATE ACCESS) H. Zoeteman, Rapporteur for ISDN-BA, presented the ISDN-BA living list; most of the items are either agreed or deleted, the only controversial item remaining is the PSD mask revision for frequencies above 300 kHz. The intent is to publish a revised version of ETR 80 and then close the work item without replacing the rapporteur (as H. Zoeteman is resigning).

TD-03 (A. Carrick, Ascom Switzerland) presents comments on the proposed new PSD mask; the new mask is suitable for usage for VDSL but some ISDN existing equipment may not fulfill this new mask. TD-32 (L. Magnone, CSELT) presents the results of actual equipment approved in Italy and concludes that the new mask would not be a problem. Measurements were made on actual lines and not on a pure 135 or 150 ohm load; a debate occurred on the actual validity of those results. TD-36, Out-of-band PSD of ISDN-BA (M. Friese DTAG), shows results for 4B3T equipment well below the new mask values with the exception of spikes due to clock signals of very limited bandwidth. TD-46, Proposal for the extension of PSD mask for ISDN-BA and 4B3T (U. Kotter, Quante, Germany), shows that the proposed new mask is too restrictive for existing equipment and proposes some relaxation to the new mask. A long and animated discussion followed on the trade-offs between: • Making it harder for ISDN and easier for VDSL

• All existing ISDN-BA equipment fulfilling the new mask or only the newly deployed ones fulfilling the new mask (which is tightened with respect to the present existing mask) LIVING LIST The TM6 Chairman proposed to update ETR 080 with all the agreed amendments and to include the revised PSD masks (2B1Q and 4B3T) contained in WD-04. VDSL experts were asked to evaluate the extent of the damage with the proposed mask and ISDN experts were asked to confirm that all existing equipment meet the requirements of that proposed mask. If no negative comments are received prior to the next meeting in Antwerp, ETR 080 will be published (after TM approval) and the Living List will be closed. ADSL The ADSL rapporteur is L. Magnone (CSELT, Italy). ADSL OVER ISDN TD-33, ADSL over ISDN Mirroring versus double FFT (presented by D. Manor jointly for Orckit/Alcatel), compares two techniques of ADSL working in an ISDN environment: the carrier mirror approach and the FFT approach. TD-33 suggests that the double FFT should be the default approach while the mirrored approach should be optional. An animated discussion followed between the Orckit/ Alcatel camp and the Motorola/Amati camp. The TM6 Chairman asked all parties to resolve that issue for the next meeting and suggested the creation of an on-line working group. It appears that some of the proponents may be defending specific silicon implementations. This item will, in any case, be placed on the living list. TD-16, Extending ADSL for operation over ISDN (P. Reusens, Alcatel Belgium), comments on the Amati contribution from Verona, TD-19. Alcatel prefers to tackle the ADSL over ISDN as an extension of the number of carriers with the carriers 32 to 63. This still allows Interworking with the mirrored spectrum proposal of Amati. TD-16 also includes a copy of WD 10 from the March 1997 meeting. TD-41, ADSL over ISDN understanding discrepancy between two analyses (A. Kliger, Metalink, Israel), explains the reasons for significant discrepancy between ADSL performances found by DTAG and Metalink. Different noise models were used - T1E1 and DTAG FSAN. TD-23, Use T1.413 issue 2 as reference (B. Dugerdil, Motorola Switzerland), proposes to transform each chapter of the draft T1E1 US ADSL 2 document (T1.413 Issue 2) into a living list item. TD-24, Upstream Pilot Tone (B. Dugerdil, Motorola Switzerland), proposes pilot tone location but was not discussed pending resolution of the FFT/Mirror issue. TD-25, ATU-R transmitter PSD mask (B. Dugerdil, Motorola Switzerland), proposes a transposition of the T1E1 proposed upstream mask to take into account the particular ISDN European case. TD-26, Motorola Support of higher downstream bit rates with S=1/2 (B. Dugerdil, Motorola Switzerland), picks up the text of the T1E1 document and proposes to insert it into the European ADSL version 2 document. This is not a Motorola contribution per se, but a help to the editor of version 2 to bring forward text that can be agreed easily. However, the FFT/mirror issues disrupted debates on these items. TD-35, Performance of echo-canceled ADSL considering noise model B plus self-NEXT (T. Kessler and W. Henkel, DTAG), evaluates the impact of self-NEXT on Upstream and Downstream ADSL link. It indicates that the noise model B may not be realistic and concludes that the upstream channel is not necessarily the determining element in the overall performance. TD-17, Preliminary results of ISDN-ADSL performance (P. Reusens and D. Verly, Alcatel Belgium), is an excellent paper describing simulations using the same splitter for both POTS and ISDN. The ISDN splitter is fully passive with a 135 kHz high-pass and a 80 kHz low-pass for ISDN. For POTS use, a single extra segment is added to the low-pass. Filter order and topology are not described in the paper. TD-14, White paper on ADSL-lite (L. Verbinnen, Alcatel Belgium), was not discussed due to lack of time. It supports making G.lite interoperable with T1.413. A general discussion followed on how to proceed on ADSL 2 and also how to ensure compatibility between ADSL version 1 and ADSL version 2; some delegates firmly stated that within ETSI some basic principles should be agreed for ADSL 2 before embarking into detailed technical solutions.

HDSL

REVIEW OF DRAFT TS 152 WD-05 gives the reasons for BT’s negative vote at the TM level on RTS/TM-06008 TS Edition 4 Draft. G. Stetdler, TM Chairman, indicated that one could bypass this negative vote but that it would be better to find a consensus. J. Cook (BT) prepared text for proposed notes for RTS/TM-06008 (WD-07); TM6 agreed to include the first note only. This document titled “Transmission and Multiplexing High Bit Rate digital subscriber line (HDSL) transmission system on metallic local lines HDSL core specification and applications for 2048 kbit/s based access digital sections” was approved as amended and will go directly to publication (without a new vote from TM). It was also proposed as an ITU G.HDSL Recommendation. TD-40, A proposal for high crest factor tests (P. Nurflus and A. Kliger, Metalink Israel), goes in the same direction, e.g., the noise test conditions are different for 2B1Q line coding and for CAP, and alignment of the crest factor is desirable. Experts are invited to contribute to the next meeting. ISDN TRANSPORT TD-47, Living List for MI/TM-06 009, “SDSL” (Mr. Schmoll, HDSL Rapporteur), shows how narrow band services POTS and ISDN BA can be carried over HDSL; delegates are invited to come with proposals for the next meeting. HDSL VERSION 5 HDSL Version 5 is planned to be available by year end and will include ISDN Transport over HDSL, crest factor related modifications and lower adaptive bit rates as proposed in TD-39 (A. Kliger, Metalink Israel). After some discussions, WD-8 was created with the agreed version 5 content. Operators were asked to confirm the need for lower bit rate symmetrical HDSL; proponents of ADSL seem to object that symmetrical HDSL is picking up part of the ADSL field of application. Contributions are invited for the next meeting on version 5 with the assumption that no new line code will be considered. HDSL VERSION 6 Some call it next generation HDSL, some call it SDSL, and some call it HDSL version 6. Work is progressing in T1E1 on that new generation with a new line code being tentatively agreed (“PAM16”). TD-11, Next Generation HDSL (P. Brackett, ADTRAN and J. Hausner, Siemens), reviews the progress made in T1E1 and proposes that ETSI start a new work item on this topic. Because the European environment is different from the US, it is proposed to start with the definition of a set of requirements. It is felt that the European transceiver may not need to be as complex as the US one. Power consumption and implementation complexity may be limiting factors to the operators which need remote powering of the line adapters. TD-29, Flexible Rate-Adaptive SDSL System (J. Benndorf and W. Guba, ke Kommunikations-Elektronik GmbH, [Alcatel Telecom]), describes a flexible rate adaptive approach for SDSL covering symmetrical as well as asymmetrical transmission rates which can be added to PAM16 codes as well as CAP or DMT. It details a possible approach to reduce NEXT in the case of higher bit rates with asymmetrical access to Internet. TD-49, Line Code Study for Multi Rate, Single Pair HDSL (J. Quilici and H. Takatori, Level One Communications), shows that the line code provisionally agreed by T1E1 is better in the high bit rate range and worse in the lower bit rate range than the 2B1Q code. WD-09 gives the agreed living list for that new work item; expected output date for the new TS is the end of 1999. A new ETSI Work Item TS600011 was also created. Jacques Besseyre, Consultelecom

10 Vol. 9.2 Copyright © CSR 1998 March 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS REPORT OF ITU-T STUDY GROUP 16, MULTIMEDIA JANUARY 26 – FEBRUARY 6, 1998, GENEVA, SWITZERLAND Complete document rosters from this SG16 meeting can be found at http://www.csrstds.com. DECIDED RECOMMENDATIONS OF SG16 The following recommendations, listed by recommendation, were approved by Decision (Resolution 1) at this meeting, and will be sent to ITU members for review: Q Rec. Title Documents Q18/16 G.511 Test methodology for G3 facsimile processing equipment in the COM 16-R6 PSTN Q19/16 G.729 Annex Annex C of G.729 (Floating Point) COM 16-45© plus C** TD-95(PLEN) Q12/16 H.222.0 H.222.0|ISO/IEC 13818-1, Generic Coding of Moving Pictures COM 16-29© Amendments and Associated Audio Information: Systems, Amendments 3 and 3 & 4 4 Q11/16 H.223 Annex Multiplexing Protocol for Low Bit-Rate Multimedia Mobile COM 16-27©, TD- A Communication over Low Error Rate Channels 53(PLEN) Q11/16 H.223 Annex Multiplexing Protocol for Low Bit-Rate Multimedia Mobile COM 16-35©, TD- B Communication over Moderate Error Rate Channels 54(PLEN) Q11/16 H.223 Annex Multiplexing Protocol for Low Bit-Rate Multimedia Mobile COM 16-36©, TD- C Communication over High Error Rate Channels 55(PLEN) Q13/16 H.225.0v2 Media Stream Packetization and Synchronization for COM 16-49©, plus Multimedia Communications Systems on Non-Guaranteed TD-68(PLEN) Quality of Service LANs Q14/16 H.235 Security and Encryption for H-series (H.323 and other H.245 COM 16-40© plus based) Multimedia Terminals TD-1(PLEN) and D.121 Q14/16 H.245v3 Control Protocol for Multimedia Communication COM 16-53©, TD- 73(PLEN) Q14/16 H.246 Inter-working of H.series multimedia terminals with H.series COM 16-38© plus Multimedia Terminals and Voice/Voiceband Terminals on TD-4(PLEN) GSTN and ISDN Q15/16 H.262 Amendments 3 (Multiview Profile) and 4 (Extension Code COM-16-30© Amendments Assignment) to Recommendation H.262|ISO/IEC 13818-2 3 and 4 (MPEG-2 video) Q15/16 H.263v2 H.263 Video Codec Standard for Real-Time Telecommunication COM-16-26© plus (H.263+) and Related Non-Conversational Services TD-25(PLEN) Q12/16 H.321 Visual Telephone Systems and Equipment for Local Area COM 16-39© Version 2 Networks Q13/16 H.323v2 Packet-Based Multimedia Communications Systems COM 16-54©, plus TD-72(PLEN) Q11/16 H.324v2 Terminal for Low Bit-Rate Multimedia Communication COM 16-37©, TD- including 61(PLEN), TD- Annexes C 56(PLEN) (Annex and D C changes), TD- 57(PLEN) (Annex D changes) Q13/16 H.450.1 Generic Functional Protocol in H.323 COM 16-42© plus TD-22(PLEN) Q13/16 H.450.2 Call Transfer Supplementary Service for H.323 COM 16-43© plus TD-22(PLEN) Q13/16 H.450.3 Call Diversion Supplementary Service for H.323 COM 16-44© Q3/16 T.120 Annex Lightweight Profile for T.120 COM 16-23© C

Q3/16 T.122 MCS Service Definition COM 16-24© Revision Q3/16 T.124 Generic Conference Control for Audiovisual and Audiographic COM 16-R 16 Revision Terminals Q3/16 T.125 Multipoint Communication Service (MCS) Protocol COM 16-25© Specification, including Annex A (T.MAP) Q3/16 T.128 Multipoint Application Sharing Protocol (T.SHARE) COM 16-22© Q3/16 T.134 Text Chat Application Entity COM 16-47© plus and D.101 Q9/16 Q3/16 T.135 Conference Reservation Protocol (T.RES.1) User-To- COM 16-R 16 Reservation System Transactions Within T.120 Conferences Q9/16 T.140 Text Conversation Protocol For Multimedia Application COM 16-48© plus D.117 Q2/16 T.170 Framework of the T.170 Series of Recommendations COM 16-R 17 Q2/16 T.172 MHEG 5 - Support for Base-Level Interactive Applications COM 16-R 17 Q2/16 T.175 Applications Programming Interfaces (API) for MHEG 5 COM 16-R 18 Q2/16 T.176 Applications Programming Interfaces (API) for Digital Storage COM 16-R 18 Media Command and Control (DSM-CC) Q4/16 V.8 Procedures for Starting Session of Data Transmission over the COM 16-32© plus PSTN TD-75(PLEN) Q9/16 V.18 Operational and Interworking Requirements for DCEs Operating COM 16-46© plus in the Text Telephone Mode TD-65(PLEN) Q6/16 V.43 Data Flow Control COM 16-57 plus TD- 42(PLEN) Q11/16 V.140 H.dispatch, formerly H.247, Procedures for Establishing COM 16-34© plus Communication Between Two Multi-Protocol Audiovisual TD-21(WP2/16) Terminals Using Digital Channels at a Multiple of 64 or 56 kbit/s Q7/16 V.252 Ex Annex B to V.25ter, Procedure for Control of V.70 and COM 16-28© H.324 Terminals by a DTE Q7/16 V.253 Ex V.voice, Control of Voice-Related Functions in a DCE by COM 16-33©, an Asynchronous DTE D.111, D.100, TD- 43(PLEN) **Germany requested the four week reservation to Annex C/G.729. ADDITIONAL APPROVALS Q Title Documents Q2/16 An Implementers Handbook for the T.170 series D.132 Q12/16 Correction to H.310 (H.320/H.321 interoperation mode stack of RAST-5 COM 16-55©. terminals) Q19/16 Corrigendum to the C-code for Annex B (silence compression) G.729 COM 16-R 20 TD- 30(WP3/16) DETERMINED RECOMMENDATIONS OF SG16 The following recommendations, listed by recommendation, were Determined (step one of the two step approval process) at this meeting, for Decision (step two) at the September 1998 SG16 meeting:

Q Rec. Title Documents Q19/16 G.729 11.8-kbit/s CS-ACELP speech coding algorithm TD-27(WP3/16) Annex E Q12/16 H.222.0 In formation Technology -- Generic Coding of Moving Pictures TD-78(PLEN) Amendment 5 and Associated Audio Information: Systems

Q13/16 H.225.0 H.225.0 Annex I (RTP Payload Format for Video Data Encoded TD-13(GEN) Annex I According to H.263+) Q14/16 H.245v4 Control Protocol for Multimedia Communication: Support for H.245v3 plus TD- H.Multilink 74(PLEN) Q12/16 H.310v2 Broadband Audiovisual Communication Systems and Terminals TD-66(PLEN)© Q13/16 H.323 Annex D for Real Time Fax TD-71(PLEN) Annex D Q11/16 H.324v2 Annex F Support for H.Multi-link TD-58(PLEN) Q13/16 H.332 Former H.LooselyCoupled, Re-Determined COM 16-41© Q13/16 H.332** H.323 Extended for Loosely-Coupled Conferences COM 16-41© Q12/16 H.bmultipoint Multipoint Extensions for Broadband Audiovisual TD-67(PLEN)© Communication Systems and Terminals Q11/16 H.Multi-link Channel Aggregation Protocol for Multilink Operation on TD-59(PLEN) Circuit Switched Networks Q4/16 V.8bis Rev Proposed Enhancements to V.8bis Annex B to TD- 92(PLEN) Q23/16 V.90 Formerly V.pcm Issue 1, A Digital Modem and Analog Modem TD-70(PLEN) Pair for Use on the PSTN at Data Signaling Rates of up to 56000 bit/s Downstream and up to 33500 bit/s Upstream **Note that H.332 has been re-Determined. This means its Decision has been deferred to the next meeting of SG16 in September 1998. The following Recommendations have been deleted, as they have been superseded by Recommendations F.702 and F.731: • F.701: Teleconference services general • F.710: Audiographic conference services general • F.711: Audiographic conference services in the ISDN • F.730: Videoconference services general SG16 GENERAL ISSUES SG16 has three Working Parties (WPs). WP Title Chair Mtg Report WP1/16, Low Rate Systems J. Magill, Lucent (UK) TD-92(PLEN) WP2/16, Services and High Rate Systems F. Tosco, CSELT (Italy) TD-80(PLEN) WP3/16, Signal Processing S.F. Campos Neto, Comsat (US) TD-90(PLEN)

BANDWIDTH REQUIREMENTS FOR EXISTING AND PLANNED MULTIMEDIA COMMUNICATION Table 1 was provided to ITU-R Task Group 8/1 for information on planned and existing multimedia recommendations, their service area, input/output bitrates or bandwidth requirements, to help TG 8/1 in the definition of spectrum bandwidth requirements for IMT-2000.

ETSI PROJECT TIPHON D. Gurle, the ETSI Technical Officer for project TIPHON (Telecommunications and Internet Protocol Harmonization Over Networks), gave a presentation on the project. TIPHON aims at developing specifications to allow interworking of voice communication between Internet Protocol (IP) networks and Circuit Switched Networks (CSN). Support for multimedia services, although not excluded, has not been explicitly spelled out in the charter of the project. The project is organized in six Working Groups and is scheduled in four phases: Phase 1: IP user calls a CSN user Phase 2: CSN user calls an IP user Phase 3: CSN user calls another CSN, the call going though an IP network Phase 4: IP user calls another IP user, the call being switched over to a CSN island, for guaranteed voice-grade Quality of Service (QoS) in Internet peak time, when severe congestion happens.

The project is planned for completion by December 1998. To achieve this ambitious goal, the group is meeting approximately every other month. Currently, the group has approved a Requirements document for Phase 1, and has a stable draft for Phase 1 items: network architecture, call control for basic calls, addressing, and for QoS considerations. H.323v2 is a main component of Phase 1 specifications, which will be released at the next TIPHON meeting. The group is preparing the work for Phase 2, and currently has prepared the table of contents and scope for Phase 2 specifications. One important item which the group has not yet addressed is billing.

Input Output Rec.(s) Expected Service Rate Rate Availability Coding: Speech coding at 4 kbit/s 64 kbit/s 4 kbit/s G.4k 2000 Wideband speech coding 224 kbit/s 16-32 kbit/s G.WB 1999 CS-ACELP Speech coding at 8, 64 kbit/s 6.4, 8, 11.8 kbit/s G.729 8 kbit/s: now 12, and 6.4 kbit/s 6.4, 11.8: Sep/98 Robust 16 kbit/s 64 kbit/s 9.6, 12, 16 kbit/s G.728 Annexes 1999 Speech coding at 5.3 and 6.4 64 kbit/s 5.3 & 6.3 kbit/s G.723.1 Now kbit/s Video coding for multimedia see note* see note* H.263 (v. 2), Now communication H.262|ISO 13818- 2 (MPEG-2) Advanced video coding for see note* see note* H.26L 2002 multimedia communication Systems: ** - For “usable” quality video Min ~ 64 kbit/s - H.324, H.320, Now in A/V applications 64 – 1920 kbit/s H.323 & H.310 ~ 4-10 Mbit/s * Video codec designs can typically operate over a wide range of bit rates. Typical video bit rates today are approx. 15- 20 kbit/s on low-resolution (QCIF) PSTN videophones, 80-360 kbit/s on medium-resolution (CIF) ISDN videoconferencing systems, and 4-10 Mbit/s for standard-resolution (BT.601 SDTV) ATM, CATV, or Satellite TV entertainment quality video. ITU-T Rec. H.263 can operate very effectively at essentially any bit rate and picture resolution, but does not presently support interlaced video formats. ITU-T Rec. H.262|ISO 13818-2 (MPEG-2) is typically used for interlaced video (typically at 4-10 Mbit/s for SDTV and perhaps twice that rate for HD resolution). The expected bandwidth needs for H.26L are that it should achieve the same quality at approximately half the bit rate of that needed for Rec. H.263 within the 8-128 kbit/s range, and that it should also provide some (perhaps diminishing) significant performance benefit for higher bit rates. ** These are preliminary estimates and will be refined at the next meetings of Q11/16 and Q12/16 in April 1998. Table 1. Multimedia Recommendations, Their Service Area, Input/Output Bitrates or Bandwidth Requirements. TIPHON has also established a Special Task Force which provide technical guidance and input to the TIPHON specifications. Additionally, TIPHON is trying to establish liaisons with other working groups worldwide (e.g., ISO, IETF, ITU), and will use SG16 as the main contact point in the ITU-T, since SG16 is the lead SG for Multimedia over IP. The group has established a demonstration test bed (TIPHONnet) with several points-of-presence interconnected via high speed frame relay circuits, which is used by volunteering companies. This testbed will last for the lifetime of the TIPHON project. Although TIPHON will not conduct interoperability tests with TIPHONnet, participating companies are welcome to conduct them. One specific issue where TIPHON requested SG16 support is on the need for a special country code for IP network endpoints. This country code would allow simple global interconnectivity by providing means to translate between IP and E.164 addresses. These country codes are the responsibility of ITU-T SG2. A Liaison Statement from SG16 to SG2 supporting the TIPHON request was prepared in WP2/16. IETF TD-27(PLEN) is a liaison statement from the ITU-T TSAG to all SGs providing guidelines on the use of focus groups, non-normative standalone documents and liaison statements. In particular, it supports the ability to reference IETF (Internet Engineering Task Force) documents in a non-normative manner in ITU-T 14 Vol. 9.2 Copyright © CSR 1998 March 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS

Recommendations. The need to improve communication with the IETF was also noted. T. Taylor (Nortel Canada) offered to be a focal point for exchange of information between the SG16 and the IETF, and this was accepted. EDH COORDINATOR FOR WP2/16 D. Lindbergh (PictureTel, USA) volunteered as Coordinator for EDH (Electronic Document Handling) aspects inside WP2/16. He will cooperate with J. Magill (Lucent), Chairman of WP1/16 and Coordinator for EDH aspects in SG16. HARMONIZATION OF THE ACTIVITIES ON RECOMMENDATIONS T.130 AND T.132 Questions 3/16, 12/16, 13/16, and 14/16 met in joint session to discuss T.130 harmonization. D.97 from British Telecom re-visits the decision generally agreed to at Sunriver (September 1997) which recommends moving the T.130 Audio-Visual Control work from Q3/16 to Q14/16. Q3/16 (Data Protocols for Multimedia Conferencing, T.120 series) had developed a generic network independent control for audio-visual functions, documented as T.130 (AVC Architecture and Overview) and T.132 (AVC Services and Protocols). D.97 recommends that this work not be transferred to Q14/16 (Common Protocols, MCUs and Protocols for Interworking with H.300-Series Terminals). TD-74(WP2/16), the report of the joint meeting of Q3, Q12, Q13, Q14, states that T.130 and T.132 will remain in Q3/16. However Q3 and Q14 will jointly lead the work on Remote Device Control (RDC) - Common Core Definition. The current goal of this work is to Determine a Recommendation at the September 1998 SG16 meeting. The architecture to be employed for user-to-user (RDC) functions has not been finalized. The group organized the functions and features documented in T.130 & T.132 into three different work categories: user to user, enhanced session control, and the remaining functions. User to User Functions (Remote Device Control): These functions include cameras, microphones, stream player recorders (CD-ROM, DVD discs), slide projectors, light sources, and document scanners. Control for the devices would be developed for two levels. The first or common core level of control contains the direct specification consistent with the definition of control currently in H.series protocols. These core capabilities will be agreed to jointly by Q3 and Q14. The T.120 device control specification will utilize and build on the common core capabilities. This will allow simple point-to-point conferences to provide elementary control without excessive overhead.

Enhanced Session Control: It was noted that a number of the remaining functions were enhanced session control functions. These session functions are closely related and enhance the T.120 generic conference functionality. It was recommended by that Q3 incorporate these functions into a revised T.124 (Generic Conference Control) or develop a second conference control recommendation, which enhances T.124. Remaining Functions: Q3 was tagged with responsibility of reviewing and evaluating the remaining functions and reporting to Q12/13/14 and WP2 at the next SG16 meeting. Q3 was requested to inform Q14 of any meetings during which these technical items are to be discussed.

Q1/16 WP2, AUDIOVISUAL/MULTIMEDIA SERVICES The Rapporteur of Q1/16 is Y. Robin-Champigneul (France Telecom, France). An interim Rapporteurs meeting is scheduled for June, in France. TD-32(WP2/16) is the progress report of Q1/16 since the last SG16 meeting. As reported in TD-46(PLEN), three general Recommendations F.701 (Teleconference Services), F.710 (Audiographics Conference Services), and F.730 (Videoconference Services) were announced for deletion in March 1997 and were deleted at this meeting. These will be replaced with F.702 (Multimedia Conference Services) in COM 1-R 74. F.711 (Audioconference Services in the ISDN) was also announced for deletion in March 1997 and was deleted at this meeting. It is replaced with F.731 (Multimedia Conference Services in the ISDN) in COM 1-R 80 (1996). REVISION OF RECOMMENDATION F.700 The major decision made at this meeting was the extension of the modular approach in F.700, Framework Recommendation on Multimedia Services, to the control functions and the processing functions, separating them from the operational aspects at the various levels as proposed in TD-5(WP2/16). A new type of modular entities

was created, the “control and processing elements” (CPEs). A provisional list of CPEs was established. This modification changes the reference model and will have to be reflected in various parts of F.700; a new set of Annexes will be allocated to the description of the CPEs. The service descriptions will also need some modification to reflect these changes, both in the existing recommendations (F.702, F.731, F.723) and in those that are being drafted (F.MRS). There was some discussion on Section 2 of Recommendation F.700, and it was proposed to split it into a separate document; such a document could be a user’s manual or a technical report of a non-normative nature that would provide guidance on how to obtain information on the users requirements and to present it in the application scripts. No decision was made. WORK PROGRAM Priorities were discussed and clarified considering the new developments in F.700: 1) Recommendation F.MRS (Multimedia Retrieval Services): Some changes were proposed in the functional model. The major functions pertaining to the multimedia retrieval services were identified and will be included in relevant CPEs. This will continue with the highest priority and it should be ready for Decision at the next SG16 meeting in September 1998. 2) CPEs for the major functions pertaining to multimedia retrieval and conference services. 3) One or more CPE(s) on security. 4) Revision of F.700: new text will be produced for the Decided modifications; the revised version should be ready for Decision at the next SG16 meeting in September, with the possible exception of Section 2 if it is decided to split it into a separate document. 5) A new version of the guide on F.700 had been drafted by the Rapporteur but was not examined because it will have to be aligned with the new evolution of Recommendation F.700. It should be ready for approval in September; its name and type of document should be discussed. 6) The application script for multimedia retrieval provided by the Associate Rapporteur G. Kelley (USA) was examined; it was decided to retain its general presentation and contents and include an example that would be representative of professional activities. It will be drafted by correspondence and should be finalized at the interim meeting. 7) Recommendation F.MCVS - Multimedia Conversational Services: work will start now on this recommendation; it may partially reuse the contents of Recommendation F.720 on the videotelephony service; the progress on this new subject will depend on the contributions and on finding an editor. SG13 LIAISON At the last meeting, SG13 had asked for comments on the draft multimedia services Recommendations I.375.1 (General Aspects) and I.375.2 (Multimedia Retrieval Service Class). They have now been Determined after taking into account most of the remarks in the Q2/16 reply, although it is unfortunate that the example which is the basis for I.375.2 could not be aligned with the service description in Draft F.MRS. Draft Recommendation I.375.z, Net- work capabilities to support multimedia services, TD-20(PLEN), provides an example of a multimedia distribution service class, switched digital broadcasting using an ATM based network. Draft I.375.z was examined and will be included in F.MRS. SG 9 LIAISON TD-2(GEN) from SG9 Q24 was provided for information. This is the introduction pages of draft J.isc, Transmission Systems for Interactive Cable Television Services, which extends the scope of J.83 (Digital Multiprogram Systems for Television, Sound and Data Services for Cable Distribution) to make provision for bidirectional data over coax and hybrid fiber-coax cables for interactive services. JOINT MEETING WITH QUESTION 9/16 A joint meeting of Questions 1/16 and 9/16 was held to examine how the particular needs of hearing impaired or visually impaired people should be taken into account in the service descriptions. After a discussion, it was decided that the text-telephony service will be included among the multimedia conversational services described in the future Recommendation F.MCVS; specific service profiles will be added for impaired people in that Recommendation and possibly in others. Question 9/16 will provide an application script from which the requirements of these particular users will be derived.

Q2/16 WP2, INTERACTIVE MULTIMEDIA INFORMATION RETRIEVAL SERVICES (MIRS) The Rapporteur is M. Blaschitz (Infonova, Austria). The meeting report is TD-95(WP2/16). No interim Rapporteurs meetings are scheduled. The following Recommendations from Q2/16 were submitted for Decision and were adopted without changes from the March, 1997 Study Group 16 meeting: • T.170, Framework of the T.170 Series of Recommendations • T.172, MHEG 5 - Coded Representation of Multimedia and Hypermedia Objects; Support for Base-Level Interactive Applications • T.175, Applications Programming Interfaces (API) for MHEG 5 • T.176, Applications Programming Interfaces (API) for Digital Storage Media Command and Control User-to- User (DSM-CC U-U) D.91, Multifunctional Terminal, Austria Post & Telekom, and Siemens, was reviewed. In Recommendation T.170 an example of a multimedia terminal is given (Clause 5). Annex 1 of T.170 contains the protocols stacks used in a multifunctional terminal supporting retrieval conversational and conferencing services. D.91 proposes to add messaging (X.400) and directory functions (X.500). A liaison statement to SG7 (TD-86(PLEN)) notes one issue with the integration of messaging and multimedia, the “Hypermedia Messaging” scenario where the multimedia content is not actually part of the message but is referenced by a hyperlink to a retrieval service. This reduces the use of network resources. IMPLEMENTERS HANDBOOK FOR THE T.170 SERIES An Implementers Handbook for the T.170 series (D.132, Deutsche Telekom) was approved at this SG16 meeting. The document provides guidelines on the conformance testing of DAVIC set-top boxes, server and the session and resource manager. It is available in English only. MULTIMEDIA MIDDLEWARE Question 2/16 has already completed a significant part of the work identified in the terms of reference for this question. The major activities of the question will be the maintenance of the standards and the work on “Middleware for Multimedia” which is a direct continuation of the work performed in the development of the T.170 series (DSM- CC, CORBA, etc.). A liaison statement (TD-86(PLEN) to SG10 informs them that SG16 is prepared to act as the lead SG for “Multimedia Middleware,” taking over responsibility for M.4 (GII Project Middleware for Multimedia). DELIVERY MULTIMEDIA INTEGRATION FRAMEWORK (DMIF) The current version of DMIF, ISO/IEC 14496-6 (see TD-8(WP2/16) from ISO/IEC JTC 1/SC29/WG11) was examined. Concerns were expressed that in the development of DMIF, care should be taken not to duplicate functionality already existing in other standards. See additional information under Q13/16 below.

Q3/16 WP2, DATA PROTOCOLS FOR MULTIMEDIA CONFERENCING The Rapporteur is B. DeGrasse (BG Consulting, US, on behalf of DataBeam). The meeting report is TD- 71(WP2/16). Q3/16 plans two interim meetings (see the CSR calendar). TD-34(WP2/16) is the progress report of Q3/16 since the last SG16 meeting. Six draft recommendations were submitted for Decision. All six were adopted without any changes: T.120 Annex C, Lightweight profile for T.120 T.122 Revision, MCS Service Definition T.124 Revision, Generic Conference Control for Audiovisual and Audiographic Terminals T.125, Multipoint Communication Service (MCS) Protocol Specification (including Annex A (T.MAP) T.128, Multipoint Application Sharing Protocol (T.SHARE) T.135, Conference Reservation Protocol (T.RES.1) T.134 (formerly T.chat), which was submitted for Decision by Q9/16, was reviewed. The modifications contained in D.101 were accepted by Q3/16; SG16 Decided T.134 as COM-16-47© as amended by D.101. The Channel ID

March 1998 Vol. 9.2 Copyright © CSR 1998 17 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS identified as CHAT-CHANNEL-0 was assigned as 12. This ID had been carried as To be defined while it was in draft status. It was agreed that T.134 be moved from Q9/16 to Q3/16. This would improve its maintenance as it is built on T.120 features.

T.120 SECURITY REQUIREMENTS D.110 (Siemens AG with assistance from P. Galvin, DataBeam) proposes a feasible and systematic approach or methodology for providing well-engineered T.120 security. This paper also reviews T.120 threat analysis, identifying some existing threats. A three tiered approach to adding additional security to the T.120 Recommendations was discussed. Security changes will be studied at the network, infrastructure (T.122, T.123, T.124 and T.125) and application tiers with emphasis initially on the network and infrastructure tiers first. An audio conference on T.120 security has been scheduled for March 3 at 11:00 EST. P. Galvin (DataBeam) has been assigned the task of editing T.security issues. The goal is to Determine a Recommendation in September 1998. T.122/T.125 MCS ENHANCEMENTS Q3/16 discussed in broad terms quality of service enhancements to improve flow control, traffic contracts, throughput enforcement, data compression, ordering across priorities, discarding of expired data, and unreliable data transfer. Other areas cited include domain management, topology management, anonymity and improved primitives. It was agreed that this is an important area and contributions are requested. An audio conference on MCS Enhancements has been scheduled for March 10 at 11:00 EST. The goal is to present a white paper at the September 1998 meeting of SG16. T.130 AUDIO/VIDEO CONTROL REQUIREMENTS AND HARMONIZATION See the joint Q3/12/13/14 report on p.15, Harmonization of the Activities on T.130 and T.132. LIAISONS

BINTERMS Project Liaison TD-35(WP2/16) from the BINTERMS project (ETSI project on Basic Interoperability of Terminals for Telematic Services, studying the basic compatibility of T.120 series terminals) requests more information on the basic compatibility requirements for terminals conforming to T.122/T.125 MCS and T.124 GCC protocols. It notes that BINTERMS is has validated T.120 using SDL and is planning to provide the specifications for basic compatibility of terminals for telematic services. TD-73(WP2/16) is the SG16 reply noting that Q3/16 welcomes SDL reference implementations. See http://www.solinet.com/binterms for additional information on the BINTERMS project. Liaison from SG7 regarding X.ECTP and X.ECTS Q3/16 reviewed TD-7(WP2/16), the liaison from Q13/7 on T.MAP and MCS, and similar draft recommendations X.ectp, Enhanced Communications Transport Protocol, CD ISO/IEC 14476, and X.ects, Enhanced Communications Transport Service, DIS ISO/IEC 13252. The liaison statement contained in TD-72(WP2/16), the SG16 liaison reply, notes that T.120 services are designed to operate across non-homogenous networks. It is possible that X.ects could be used as a transport mechanism for T.120 via MCS and MAP, but this needs further review. T.120 I MPLEMENTERS GUIDE The status of the T.120 Implementor’s Guide was reviewed. It was decided to remove obsolete information. Static channel ID assignments were included for T.134 and T.128 in the appropriate table in the T.120 section of the guide. Descriptive text was included in the same section of this guide for T.134, T.128 and T.135. TD-76(PLEN) contains the change pages from COM 16-R 3 to create version 6 of the T.120 Implementor’s Guide. ENHANCED SESSION CONTROL FUNCTIONS TD-82(WP2/16) is the report from the Joint Q3 & Q14 Meeting on Enhanced Session Control to address the requirements of a Virtual Meeting Room environment. The work is planned for Determination in September 1998, and addresses a subset of the functionality formerly contained with the Q3 T.13x work. It will focus upon addressing generic components of the protocol and specific audio controls and indications needed in the provision of audiographics solutions. In the longer term it is expected that this work will include further support for audio and video management, based upon a harmonized solution agreed by both Q3/16 and Q14/16. 18 Vol. 9.2 Copyright © CSR 1998 March 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS

Q4/16 WP1, MODEMS FOR SWITCHED TELEPHONE NETWORK AND TELEPHONE TYPE LEASED LINES The Rapporteur is D. Stuart (3Com, US). This work includes two Associate Rapporteur Groups on V.8/V.8bis (modem start-up) and on V.70 and V.75 maintenance. No interim meetings were scheduled for High Speed Modems (HSM) or V.70 (DSVD system) and V.75 (DSVD Control) maintenance; two interim meetings were requested for V.8 and V.8bis, joint with Question 23/16 (see the CSR calendar). TD-03(WP1/16) is from the Q1/8 (G3 fax) Rapporteur and raises an issue of nomenclature (use of the terms calling and called in V.8 and V.34) when manual initiation of V.34 G3 fax is used. Q4/16 approved TD- 31(WP1/16) (Q4/16 Rapporteur), the reply liaison to SG8 noting that no change was deemed necessary to V.8 or V.34. D.99 (UK) is titled Ambiguities in the V.34 Recommendation. It notes ambiguities that appear in section 10.1.3.3 (definition of the J sequence) and section 10.1.3.9 (definition of the MP sequences). TD-18(WP1/16) (L. Brown, Q23/16 Rapporteur) notes that while developing V.pcm, clarifications to the V.34 Recommendation were identified in 11.1.1.1 (Phase 1,Call modem), 11.2.1.1.2 (Phase 2, Call modem) and 11.2.1.2.2 (Phase 2, Answer modem). TD-77(PLEN) (R. Stuart, Q4/16 Rapporteur) provides text changes to V.34 to address the editorial issues noted in the two papers above and also provides the editorial corrections to support the addition of Annex A of V.34 (seamless rate change). Annex A was Determined at the previous SG16 meeting. V.34 (revised) was Decided with Annex A as contained in COM 16-56© and amendments in TD-77(PLEN). RECOMMENDATIONS V.8 AND V.8BIS Working Party 1/16 addressed Question 4/16 (V.8/V.8bis) under the Rapporteur L. Brown (Motorola ISG, USA). TD-13(WP1/16) (L. Brown, Q23/16 Rapporteur) is the report of the Sunriver, Oregon, V.8/V.8bis Rapporteur meeting. Q4/16 approved an additional codepoint for V.pcm to be included in revised Recommendation V.8 (COM 16-32©, Decided at this meeting). The new V.8 codepoint and supporting V.8 text changes are detailed in TD-75(PLEN) (L. Brown, Q23/16 Rapporteur). New codepoints for inclusion in Recommendation V.8bis were requested by Question 11/16 in TD-21(GEN) (T. Geary, Q11/16 Rapporteur) for H.Multilink, and in TD-24(GEN) (T. Geary, Q11/16 Rapporteur) for T.140 (text chat). These new codepoints and also the codepoints for V.pcm were acceptable to Q4/16 and are detailed in TD- 96(PLEN). At the Joint WP1, WP2, WP3 meeting, K. Krechmer (Israel on behalf of Vocaltec) reminded the meeting of the issues which are particularly important in voice over IP applications. One identified improvement is to allow for the modem training process and the transfer of login information to the Internet Service Provider to be done in parallel, which could be achieved by additions to Recommendations V.8 and/or V.8bis. It was pointed out that a comprehensive understanding of all the aspects involved in this issue is necessary, including the protocol start-up aspects. T. Taylor (Nortel, Canada) agreed to coordinate a group to identify the actions necessary towards this goal. He will also exchange information with the IETF on the issue. It was noted that the work on V.pcm should not be delayed by this study. D.123 (Ministry of Communications, Israel, K. Krechmer on behalf of Vocaltec) discusses the optional use of V.8bis with V.pcm. Use of V.8bis is one means to support reduced Internet access time. A delay of 3 seconds when a V.8bis answering modem responds to a V.8 calling modem was previously identified. An ad hoc meeting was held to discuss possible enhancements to Recommendation V.8bis to facilitate faster start-up in mixed V.8/V.8bis answering environments. A proposed solution was developed (optional modified V.8bis transaction 4) and is contained in Annex B to TD-92(PLEN), the WP1 report. This revision to Recommendation V.8bis was Determined by SG16.

Q4/16 identified and approved a new work item to address whether or not to mandate calling tone. This work is also of interest to Q9/16.

V.70 AND V.75 RESULTS The Associate Rapporteur C. Hansen (Intel) was unable to attend the meeting. The proposed informative Appendix to Recommendation V.75, concerning session establishment using V.75/H.245 is contained in TD-27(GEN) from the March, 1998 SG16 meeting. This was endorsed in principle at the March, 1998 SG16 meeting and was approved at this meeting. It was proposed that Recommendations V.70 and V.75 be updated to include the changes currently documented in their Implementor’s Guide, and that the revised Recommendations be Determined at the next meeting of SG16.

Q5/16 WP1, ISDN TERMINAL ADAPTERS, AND INTERWORKING OF DTES ON ISDNS WITH DTES ON OTHER NETWORKS The Rapporteur is J. Moughton (Hayes, UK). The meeting report is TD-44(WP1/16) (J. Moughton, Q5/16 Rapporteur). No interim meetings were requested. Q5/16’s main activity consisted of liaisons with SGs 11 and 13 in order to maintain the alignment of various V- series Recommendations with those that are the responsibility of the other Study Groups. Q5/16 agreed to accept responsibility for the maintenance of H.dispatch (now V.140), from Q11/16. LIAISON STATEMENT TO SG13 Q5/16 noted that no reply had been received from SG13 to the Liaison Statement sent from the March 1997 meeting of SG16 (COM 16-R 1, Annex 9), and agreed to re-send the liaison statement, requesting a response in time for the next meeting of SG16. It was discovered that the original liaison statement was based on an out-of-date version (1988) of I.464. In the new liaison statement, TD-43(WP1/16), a revision of the previous liaison, COM 16-R 1- E©, Annex 9, the text has been modified to refer to the current version (1991). LIAISONS WITH SG11 TD-07(WP1/16) (S. Rengasami, Bellcore) contains the liaison statement from SG11. Q5/16 noted that SG11 had completed the requested amendments to Q.931. See CSR-T 8.4 page 34 for additional details. TD-42(WP1/16) (J. Moughton, Q5/16 Rapporteur), a revision of TD-11(WP1/16) (J. Moughton, Q5/16 Rapporteur), requests SG 11 make a correction to the meaning of the User Rate code point 00000 in Q.931 when applied to the V.110 and V.120 rate adaption protocols. The liaison also requests the addition of modem type code points to Q.931 for V.32bis, V.18 and V.90 (V.pcm) analog and digital modems. This request is made jointly with Q9/16 and Q23/16. V.130, ISDN TERMINAL ADAPTER FRAMEWORK Q5/16 agreed to update V.130 to reflect recent developments in the functionality of ISDN Terminal Adapters (TAs) such as multiple DTE ports, digital-end PCM modems and new rate adaption protocols such as Point-to-Point Protocol (PPP). To this end it was agreed that V.130, “ISDN Terminal Adapter Framework” revision, should be revised.

Q6/16 WP1, DTE-DCE INTERCHANGE CIRCUITS The Q6/16 Rapporteur is R.-R. Damm (Deutsche Telekom, Germany). SG16 Decided V.43 (ex V.fc), data flow control, in COM 16-57© with an editorial correction in TD-42(PLEN). The meeting report is contained in TD- 92(PLEN) the WP1 report. TD-22(WP1/16) is the agenda. Q6/16 requested up to four interim Rapporteurs meetings if Q4/15 (xDSL) accepts the offer to work on DTE/DCE interface for xDSL modems. These meetings could be held in conjunction with Q4/15 (see the CSR calendar). INCOMING LIAISONS TD-04(GEN) (ITU-R Q249/11) discusses the use of computer technology in television broadcasting applications. ITU-R considers the rapid increase of introduction of computer technologies in TV broadcasting applications and asks, “What areas in the application of computer technology outside the production process require further study and what program of work is required,” and “In which areas are Recommendations required, to enable the interworking of

computer and television systems.” It may be assumed that in the near future interfaces may be needed to connect TV equipment with DTE and/or DCE equipment. TD-34(WP1/16) (Q6/16 Rapporteur) contains a liaison statement to the ITU-R, sent to make ITU-R aware of the existence of Q6/16 “DTE/DCE Interchange Circuits,” and to offer the collaboration, expertise and service of SG16 in developing an appropriate interface(s). TD-02(WP1/16) (E. Blausten, Q6/7 and Q8/7 Rapporteur) contains a liaison from SG7 to SG16 on DTE-DCE interface interchange circuits. This liaison statement is a response to a liaison statement from SG16 after their March 1997 meeting, about the study in Q6/16 to include in the V.24 definitions of interchange circuits statements as to the respective type of sensitivity (state or transition). SG7 recognized a possible impact of this study to their work, specifically under Recommendations X.21, X.33 and X.36. Q6/16 did not quite understand the relationship between Recommendation V.24 and the named Recommendations, but saw a closer relationship with Recommen- dations X.20bis and X.21bis. It was decided to send a new liaison statement to SG7, contained in TD- 36(WP1/16) (R. Damm, Q6/16 Rapporteur). The liaison was appended to a revised and corrected version of D.92 (R. Damm, Deutsche Telekom AG), which contains the proposed additions defining the “sensitivity” of each circuit and related changes to clause 4 of V.24. DTE-DCE INTERFACES FOR XDSL MODEMS D.106 (F. Lucas, 3Com, USA) points out that presently all the different Digital Subscriber Lines (xDSL) modems are being studied under Question 4/15 and in other Standards Development Organizations (SDOs) like ETSI and ANSI. One important aspect has not yet been addressed by any of the SDOs, namely the DTE-DCE interface. In the USA, a new project has been initiated in TIA TR-30.2 whose goal is to produce a standard for a DTE-DCE interface for xDSL modems. This study will encompass the mechanical, electrical, functional and local protocol aspects of the interface. The USA recommends that a complementary study of these interface issues also be initiated in the ITU-T. F. Lucas (3Com) pointed out that: • No firm proposal for an appropriate interface has yet been brought forward to TR-30.2, and that the issue is quite new; • Local protocol aspects would fall under the responsibility of Q7/16, “DTE-DCE Protocols.” It was decided that a joint liaison statement, TD-35(WP1/16) (R. Damm, Q6/16 Rapporteur), would be sent from Q6/16 and Q7/16 to SG15 in order to invite liaison and collaboration between the two Study Groups. D. Stuart (Q4/15 Rapporteur) pointed out that the study on xDSL modems is under a very tight time schedule, and that Q4/15 is expected to have a draft Recommendation ready for Determination by October 1998. To achieve this goal, four four-day meetings of Q4/15 are planned between April and August 1998. Q6/16 proposed to work with SG15 to determine the appropriate requirements and meeting schedule. This could include joint meetings of the Q6/16, Q7/16 and Q4/15 Rapporteur Groups. REVISION OF RECOMMENDATION V.24 Revision of V.24 had been discussed at the March 1997 meeting of SG16. D.92 (R. Damm, Deutsche Telekom) contains a written proposal on respective types of sensitivity (state or transition) in the V.24 definitions for control and indication circuits. The contribution also contains a proposal to re-arrange Section 4 of V.24. Rationales for the proposed choices for type of sensitivity are offered in the document. It was decided that the proposal be brought to the attention of the National Standardization Bodies (NSBs) with a view to coming to a conclusion at the September 1998 meeting of SG16. The Q6/16 Rapporteur suggested that the NSBs also discuss whether V.24 contains definitions for interchange circuits that never were, or are no longer used in practice. As V.24 is a very old Recommendation, it is likely that notions that were valid at the time the Recommendation was written were superseded by later developments, e.g., in the field of DTE-to-DTE and DTE-to-DCE protocols. Obsolescence may include the 200-series of interchange circuits in toto. The aim is to create a new version of Recommendation V.24 by the end of the Study Period (i.e., 1999); this new version will be better adapted than the present one to the needs of actual equipment and equipment implementation practices.

USB INTERFACE B. Pechey (Hayes, UK) referred Q6/16 to the implementation of the so-called “Universal Serial Bus” (USB) interface that is being implemented in new PC equipment and has become a “de-facto standard.” The USB may be proposed by the computer industry as a candidate for the DTE-DCE interface in xDSL modems. As the USB has been developed outside of recognized standardization bodies like the ITU-T, ISO/IEC JTC1, ETSI, ANSI etc., it may be difficult for these bodies to catch up with the development. B. Pechey (Hayes, UK) suggested a collection of available information about the USB and contact of its protagonists in order to convert the de-facto standard into a recognized international standard/ recommendation. This suggestion was agreed by Q6/16.

Q7/16 WP1, DTE-DCE INTERFACE PROTOCOLS F. Lucas (3Com, US) is the Q7/16 Rapporteur. The meeting report is TD-45(WP1/16). TD-20(WP1/16) is the agenda. TD-21(WP1/16) is the report of the Sunriver meeting of Q7/16, September 1997. Four interim meetings will be held prior to the September 1998 SG16 meeting. Q7/16 reviewed TD-4(GEN), a liaison from the ITU-R (Radio Sector). This liaison is the text of Question ITU-R 249/11 which describes the use of Computer Technology in Television Broadcasting Applications. It notes that the use and integration of PCs in TV broadcasting applications is being studied. Although the liaison did not request a response, a joint liaison (TD-34(WP1/16)) with Q6/16 (DTE-DCE Interfaces) was approved back to ITU-R SG11 offering whatever assistance Q6/16 and Q7/16 could be in their future work. RENUMBERING OF V.25TER AND V.25TER ANNEX A The V.25ter series of Recommendations are being renumbered: V.250 (ex V.25ter, AT command interface) V.251 (ex V.25ter Annex A, DTE control of V.8/V.8bis) V.252 (ex V.25ter Annex B, Control of V.70 and H.324 Terminals by a DTE) V.253 (ex V.voice) Q7/16 reviewed the ex V.25ter Annex A to see if it could easily be made a standalone Recommendation. This was found to be the case with only editorial changes needed by the TSB to republish it as Recommendation V.251. STATUS OF V.252 (EX V.25TER ANNEX B) AND V.253 (EX V.VOICE) V.252 (COM 16-28©) was Decided at the opening plenary of SG16. V.253 (ex V.voice) was also Decided at the opening plenary with changes recommended by the United States (D.111) and supported by the UK (D.100). In addition, in reviewing the draft of the proposed Recommendation (COM 16-33©) it was discovered that a reference to FCC Part 68 was included which was inappropriate. TD- 43(PLEN), a correction removing this reference, was also adopted. V.250 (EX V.25TER) SUPPLEMENT REVISION This work updates the Supplement to V.25ter. This draft includes the commands found in Recommendations V.252 and V.253. The supplement is a compilation of all known V.25ter (AT) commands which have been defined in the ITU-T and regional standards organizations. With the renumbering of the V.25ter series, it was agreed to change the title of the document to the V.250 series Supplement. A draft of the revision (TD-29(WP1/16)©) was reviewed. It was agreed that an “in depth” review of the document will be done prior to seeking approval at the September 1998 Study Group 16 meeting. XDSL DTE/DCE INTERFACE PROTOCOLS Q7/16 reviewed D.106 (United States) which informs Study Group 16 that work has begun in the US in standards group TIA TR-30 on the development of DTE/DCE Interface and Protocol standards to support xDSL modems. The contribution encourages the ITU-T to begin similar work to support the xDSL modem work taking place under Question 4, Study Group 15. This same contribution was considered in the Q6/16, DTE-DCE Interfaces, discussions. Both groups agreed that they would be willing to take on this new work if Study Group 15 requested it. A resulting joint liaison (TD-35(WP1/16)) was sent to Study Group 15 offering this assistance. A prompt response is expected from Study Group 15 in that they are meeting February 9-20 (the two weeks following the Study Group 16 meeting). It was also understood that the xDSL work in Q4/15 is to be done on an expedited basis,

22 Vol. 9.2 Copyright © CSR 1998 March 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS with a goal of Determining the draft Recommendations at their October 1998 meeting. In order to provide the interfaces and interface protocols, Q6/16 and Q7/16 requested a maximum of four interim Rapporteur meetings prior to the September 1998 meeting of Study Group 16. A good deal of this work will also be done within the US in the TIA TR-30.2 group. Although this work is just beginning and the exact requirements from Q4/15 are not yet known, there was interest in using the Universal Serial Bus (USB) which has been developed by a consortium of companies. D.112 (Intel) proposes using Ethernet, USB and IEEE 1394 (Firewire) interfaces to support xDSL DCE depending on the PC vintage and recommends USB in the future. Q7/16 felt that this useful contribution could be used for background information in the development of the protocol recommendation. RECOMMENDATION V.25X ISDN TA COMMANDS J. Moughton (Hayes UK, editor) presented D.134, the first draft of Recommendation V.25x ISDN TA Commands. This is a very comprehensive draft. Although not widely seen in the US, Basic Rate ISDN is popular in European countries (7% penetration in Germany). Because there is no Recommendation for the standardization of commands for ISDN Terminal Adapters, this work has been undertaken by Q7/16. Although time did not permit a through examination of the draft, it was agreed that a basic ISDN TA Command Recommendation should be available for Determination at the September 1998 SG16 meeting. IMPLEMENTOR’S GUIDE FOR V.250 (EX V.25TER) Q7/16 reviewed COM 16-31© which had been approved at the March 1997 meeting of Study Group 16 as the Implementor’s Guide for Recommendation V.250 (ex V.25ter). This text has been included in the published V series Implementor’s Guides. It was observed that the published version contains an error in the 6th line of Table 16 which is the result code for V.23 in Slave Mode. The code should be as in COM 16-31©, +MV18:V23S.

Q8/16, WP1 DCE/DCE PROTOCOLS The Q8/16 Rapporteur is B. Pechey (Hayes, UK). The meeting report is contained in TD-92(PLEN) the WP1 report. TD-28(WP1/16) is the agenda. Q8/16 maintains Recommendations V.42 (DCE to DCE error control), V.42bis (DEC to DCE compression), and V.76 (DSVD multiplex). No liaisons were received or sent, and no interim meetings were requested. COM 16-50© (M. Sherif, AT&T) contains the report of the Rapporteur’s Meeting in Amsterdam, 26-27 June 1997. COM 16-52© (M. Sherif, AT&T) contains a comparison of two different techniques for multiplexing voice and data traffic over low-speed, point-to-point links. The contribution explains that Q18/16 needs a multiplexing scheme to operate over a modem link between a subscriber’s premises and either an Internet Service Provider (ISP) or a telephone switching center. This multiplexing scheme is needed so that circuit-switched voice calls may be linked in several ways with information on the World-Wide Web. Typical applications would include making travel reservations or any similar system in which a voice call could add value to a transaction. AT&T has considered the possibilities and feels that the V.76 scheme used in V.70 Digital SVD (DSVD) modems is the best choice; however, they have reservations about the reliability of the optional suspend/resume mechanism. In COM 16-52©, AT&T proposes an implicit suspend/resume mechanism using timers, thus achieving even better efficiency. This mechanism could be included in V.76 as another optional Annex. In the discussion, Q8/16 delegates wanted to see the results of tests which showed that the performance of suspend/resume was inadequate in the applications being considered by Q18/16. M. Sherif did not have such data available but will try to collect information for the next Q8/16 meeting. Q8/16 then considered why there have been very few contributions and little interest in the work of Q8/16. Some members felt that the current intense activity in Q23/16 on PCM modems has diverted interest away from Q8/16. When the Q23/16 work is completed there may be a resurgence of interest. It was also suggested that work in Q4/15 on xDSL matters may require use of the expertise in Q8/16. The Q8/16 Rapporteur reviewed the topics to be studied and pointed out that compression of synchronous data and transport of V.250 commands could be completed with little extra work, and suggested that contributions be made either to complete the work or suggest that it be canceled. Work on secure access, improved compression algorithms and end-to-end flow control has not yet started.

Q9/16 WP1, MULTIMEDIA ASPECTS OF SPECIAL INTEREST TO PEOPLE WITH DISABILITIES The Q9/16 Rapporteur is G. Hellström (Omnitor, Sweden, representing the Swedish Telecom Authority at the ITU). The meeting report is in TD-92(PLEN), the WP1 report. A joint interim meeting with Q14/16 was requested to progress the work on the H.246 Annex “Text Interworking.” Implementations based on new and revised Recommendations for text conversation in all popular telephone and multimedia environments will enable conversation in the three natural modes commonly used between people: writing to, talking to and viewing each other. For people who have limitations in capabilities in any of these modes, it is important to have an opportunity to select any combination that supports their capabilities and preferences. Subsets, like the universal text telephony, are important where cost, network limitations or terminal constraints call for them. Q9/16 is open to proposals for work in other areas of accessibility to multimedia. V.18 TEXT TELEPHONE V.18 (revised) was Decided with the Annex as contained in COM 16-46© (Q9/16 Rapporteur), and the amendments in TD-65(PLEN) (Q9/16 Rapporteur). D.125 from BT Labs, ISCTI (Institute Superiore delle Communicazioni e delle Tecnologie dell’Informazions) and Telecom Italia, provides implementation tests for V.18 DCEs. The tests identified include interworking with BT reference implementations, and 65 defined operational tests. D.125 will be further developed with the goal to add this as an Appendix to V.18. D.124 (A. Farquharson, BT Labs) discusses the need to clarify and detail the V.8bis sequences in V.18 Appendix 3. The proposal was agreed, and support for that activity sought in Q4/16. D.124 also proposes a new low complexity scheme for simultaneous voice and 300 bit/s text using V.18 and V.8. BT was asked to demonstrate that the scheme would provide suitable audio quality and substantial cost reduction compared to the currently recommended methods V.61 and H.324. The usefulness of text conversation in mobile networks was highlighted in D.98 (BT) and a liaison statement (TD- 38(WP1/16)) was sent to ETSI Special Mobile Group (SMG) asking for V.18 DCEs in the interworking units to the Global System for Mobile Communications (GSM) network. A codepoint in Q.931 for V.18 has also been requested by Q5/16. T.140, TEXT CONVERSATION PROTOCOL FOR MULTIMEDIA APPLICATION A logical channel for T.140 in H.324 was decided and codepoints were assigned in V.8bis for declaring this capability. This work was undertaken by Q11/16, Q14/16, and Q4/16 in cooperation with Q9/16. TD-14(GEN) (G. Hellström, Q9/16 Rapporteur) introduces work initiating interworking between text conversation in different environments including V.18, H.324, H.323, H.320 and mobile as an Annex to H.246 in cooperation with Q14/16. In September 1997, it was agreed with Q13/16 and Q14/16 that a simple logical channel path for T.140 text conversation in H.323 was to be arranged. T.134 is a simple application entity to carry T.140 through the T.120 structure. This supports most H.323 devices with a full keyboard. Concern was raised that T.140 over T.134 over T.120 may be “heavy” for some environments. GII F.4, END-TO-END INTEROPERABILITY Initial project planning discussions on participating in Global Information Infrastructure (GII) project “F.4 - End - to - end interoperability” with the example of text conversation interworking was held with Q16/16. TD-41(PLEN) (JRG on GII) provides the allocation of work on GII projects. F.MVCS SERVICE Initial discussions on participating in the work with the F.MVCS (Multimedia Conversational Services) service description was held with Q1/16. The three modes of conversation were described: text, voice and video. A study of the F.700 environment was initiated. D.115 (G. Hellström, Q9/16 Rapporteur) served as the base of the discussion. The plan is to complete the description in September 1998.

JOINT MEETING WITH Q15/16 TD-01(GEN) (G. Sandini, University of Genova) discusses the background of a videophone method for signing and lip-reading using a retina-shaped video camera sensor. This was discussed with Q15/16 as a special display format to be specified in H.263. The mechanism of specifying it as a non-standard codec in H.324 was advised. Q15/16 encouraged Q9/16 to provide additional material on the performance of this technique. See also the Q15/16 report, below. Q9/16 promised to send test sequences for video codec evaluation with sign language material to Q15/16. The sequence, “Irene,” is now ready on tape and will be converted to Common Intermediate Format (CIF) and Quarter CIF (QCIF) format. TD-16(GEN) (G. Hellström, Q9/16 Rapporteur) introduces the sign language video clip which contains a significant amount of finger spelling, the most challenging for video codec performance. From the video it can be seen that 25-30 fps are needed for full sign language perception and that 12.5-15 fps gives some usability. TD-26(GEN), which expands on TD-16(GEN) to create a draft application profile on sign language and lip reading application of video communication, was introduced to Q15/16. The intention is to complete this application profile in September 1998.

Q10/16 WP1, MODEM TESTING The Q10/16 Rapporteur is G. List (Austria). The meeting report is in TD-92(PLEN), the WP1 report. The Rapporteur, G. List (Austria), was unable to attend the meeting. As the only contribution, D.108 (J. Houdard, Texas Instruments), is a proposed provisional international network transmission model for evaluating PCM modem performance (based on the work in TIA TR-30.3), it was agreed that this contribution would be considered under the work of Q23/16 (see below). One interim meeting is requested to progress the work on the new Recommendation on the network model for PCM modem testing. This meeting would be co-located with a meeting of Q23/16, in the summer of 1998, in Europe.

Q11/16 WP2, CIRCUIT-S WITCHED NETWORK (CSN) MULTIMEDIA SYSTEMS AND TERMINALS The Q11/16 Rapporteur is T. Geary (Rockwell, US). The meeting report is TD-84(WP2/16). TD- 30(WP2/16) is a progress report for Q11/16, summarizing three Rapporteur meetings held since the last SG16 meeting (March 1997). Q11 is planning three interim meetings (see the CSR calendar). LIAISON WITH ISO/IEC Following a request from Q11/16, WP2/16 appointed C. Quist, KPN Research, The Netherlands, as Liaison Rapporteur with ISO/IEC JTC1/SC29 WG11 regarding a file format to be used for non-conversation services applications. The purpose of this Liaison is to exchange information on the H.324 file format and MPEG’s intermedia format, and, if possible, to harmonize the work on these activities. V.140 (EX H.DISPATCH, EX H.247)

COM 16-34©, H.247 (Procedures for Establishing Communication Between Two Multi-Protocol Audiovisual Terminals Using Digital Channels at a Multiple of 64 or 56 kbit/s) and TD-21(WP2/16), Changes to COM 16- 34, were reviewed, and editorial errors were corrected. The numbering of this Recommendation was discussed; Q11/16 members recognized the importance of this protocol being included in ISDN Terminal Adapters and therefore recommended that it be assigned a number in the V-series. This draft Recommendation was Decided as V.140 by SG16. Q11/16 recommended that the maintenance of V.140 (ex H.dispatch) be assumed by Q5/16. Q5/16 agreed (see Q5/16 report, above). H.324V2 AND RELATED CHANGES TO H.245V3 COM 16-37© is a copy of the draft Recommendation H.324v2. The following documents propose changes to H.324v2 Annex C and Control and Indication in H.245v3: • COM 16-53©, Recommendation H.245 - Control Protocol for Multimedia Communication

• D.103, Support for Control Channel Segmentation and Reassembly Layer (CCSRL) Solution for the H.324/Mobile Control Channel Problem (COMSAT). This proposal to use CCSRL instead of AL4 (Adaption Layer 4) was accepted. • TD-18(WP2/16), Proposed Changes for H.324 Revision 2 Annex C • TD-19(WP2/16) provides proposed changes to H.324v2 Annex D; Q11 supported the inclusion of Supplementary services and recommends H.324v2 Annex D (Supplementary Services) be approved at the closing plenaries. (The control and indication support [H.245] for Supplementary Services is included in TD-2(PLEN)) • TD-2(PLEN), Editorial Changes to COM-16-53 (H.245v3) • TD-23(PLEN), Required Modification to COM-16-53 (Draft H.245v3) After review and discussion, Recommendation H.324v2 was Decided by SG16, as COM 16-37© plus TD- 61(PLEN). TD-56(PLEN) provides the changes to Annex C. TD-57(PLEN) provides the changes to Annex D. There were no contributions or further changes noted for H.324 Annex E. Q9/16 requested (TD-24(GEN)) of Q4/16 the addition of a code point for T.140 in the V.8/V.8bis H.324 capabilities field. Q4 approved this request. See the Q4/16 report above for details. IMPLEMENTORS GUIDE FOR H.324 ANNEX D TD-29(WP2/16)©, is the proposed draft Implementors Guide for H.324 Annex D. It was noted that there are three different spheres of influence for the basic rate ISDN services: Europe, Asia and North America. Due to these differences, it was felt that the procedures of this proposed Implementer Guide would not be functional in Asia or North America. It was agreed that the details added to support ECT (Explicit Call Transfer) in H.324 Annex D (ref. TD-19(WP2/16)) would remain. The text for the proposed draft Implementers Guide was not accepted. Instead it was proposed that a new work item be started as a separate work project in Q11/16 with the goal of bringing Supplementary Services into the H.324 Recommendations in general. This proposal was accepted. H.223 ANNEXES PROPOSED FOR DECISION COM 16-27©, and TD-25(WP2/16) provide H.223 Annex A, Multiplexing protocol for low bit rate multimedia communications over low error-prone channels. Changes to A.1 were not accepted because change for the segmentation layer is now defined in Annex C of H.324. All other changes were approved. TD-53(PLEN) is the revision. COM 16-35©, and TD-26(WP2/16) provide H.223 Annex B Multiplexing protocol for low bit rate multimedia communications over moderate error-prone channels. Changes to B.1 were not accepted because H.223 Annex A no longer describes any adaptation layer. With some additional editorial changes shown in TD-54(PLEN), H.223 Annex B was approved. COM 16-36©, and TD-27(WP2/16) are H.223 Annex C. With a number of changes to equations and text in TD-55(PLEN), Annex C was approved. H.MULTI-LINK Q11/16 reviewed and approved TD-59(PLEN), draft H. Multilink, a channel aggregation protocol for multilink operation on circuit switched networks. H.Multilink was Determined at the SG16 meeting. TD-21(GEN) requests the necessary V.8bis code points from Q4/16 for H.Multilink. H.320 SYSTEM ACTIVITY

H.221 D.109 (Deutsche Telekom) proposes amendments to Table A.2 of Rec. H.221, regarding Capabilities and Commands for STI (NA, ISDN) and STI (NA, H.221/nx64). In order to support Digital Audio Broadcasting, the Service Transport Interface (STI) is specified and now being standardized in ETSI. D.109 requests that appropriate capability and command values be inserted in Table A.2 of H.221 (BAS codes). It was agreed that this was a viable change but it was noted that this seemed to be a request for transport of a datastream which was not part of any International Standard or Recommendation. The group agreed to add this to the agenda for future work. H.263v2 in H.320 There will be work in the upcoming experts meetings to include H.263v2 in H.320 systems. S. Gupta (VTEL, USA) will be the editor for this work.

OTHER H.32X SYSTEMS COM 16-58© (France Telecom) is a new Annex for H.323 on ISDN. In general there was concern that this implementation would not be backwards compatible with existing H.320 terminals (or the new H.324/I terminals) and would probably not offer the optimum solution. It was further noted that the details of implementation may need further clarifications and suggested that this should only be in an Implementors Guide for H.323. JOINT Q11, Q12, Q13 AND Q14 MEETING TD-20(GEN), Editorial Changes to COM-16-53© (H.245v3), was presented; the changes in support of H.324 Annex C and D were included. It was agreed to forward draft H.245v3 as modified by TD-20(GEN) for approval. H.245v3 as shown in COM 16-53© with the changes in TD-73(PLEN) was Decided at the SG16 Plenary. TD-3(PLEN), Draft Recommendation H.245 Version 4, was presented and the changes to COM 16-53© in support of H.Multilink were addressed. It was agreed that additional inputs would be provided by Q12/16 and Q13/16. H.245v4 shown in COM 16-53© and TD-74(PLEN) was Determined by SG16. The current version of DMIF, ISO/IEC 14496-6 (attached to TD-8(WP2/16) from ISO/IEC JTC 1/SC29/WG11) was examined. See also the Q13/16 report below. D. Skran, Rapporteur for Q13 drafted a liaison (TD- 99(WP2/16)) to ISO/IEC noting the following: 1) Concerns with performance 2) Invite them to next meeting 3) Are there any overlaps with T.12x 4) Concern with over use of H.323 text It was agreed that H.246, Interworking of H-series Multimedia Terminals, Annexes relative to H.324 and H.324M (mobile) interworking would be addressed during upcoming joint meetings. TD-17(PLEN), from Multimedia Coordination (SG13) requested input noting that no contributions have been received. TD-40(PLEN), Report from the Workshop on GII (JRG on GII), provides reference information for GII regarding the F.3 Information Appliances and M.4 Middleware for Multimedia Projects identified in SG13. TD-41(PLEN), Allocation of Work/GII Standardization Projects, identifies Q11/16 as one of the ITU-T entities responsible for GII Project F.3, Information appliance. The need of a Liaison Rapporteur from SG16/WP2 to the GII JRG was noted but no candidate volunteered. TD-92(WP2/16) is the liaison response, from the acting Q14 Rapporteur M. Reid, to SG13 and also SG8, SG9, SG12, SG13, DAVIC, IEC TC 100 and JTC 1 listing the Recommendations in SG16 that relate to F.3 and F.4 (GII: End-to-end interoperability), and the planned Recommendations for Decision in September 1998. JOINT Q11 AND Q15 MEETING The status of the video codec work was reviewed with Q15. There was agreement that next versions of video codecs should represent significant improvement over H.263v2 before they are standardized. Both groups re-iterated that the market needs to catch up with the current Recommendations. Further versions would just confuse the market. The work should focus mainly on maintenance of current Recommendations rather than development of new Recommendations. LIAISONS TD-26(PLEN) (TSAG) provides draft guidelines on the Quality Aspects of Protocol Related Recommendations, noting the use of the X.290 series of Recommendations for conformance testing. Q11 members noted there is a trade off between quality and level of effort involved and that this draft imposes a number of processes and procedures that may not be necessary in smaller, simpler protocols. TD-83(WP2/16), Reply Liaison to SG11/Q11, requests a Code Point for “H.223 and H.245” in Q.931.

Q12/16 WP2, B-ISDN MULTIMEDIA SYSTEMS AND TERMINALS The rapporteur is S. Okubo (Graphics Communication Labs, Japan). The Q12/16 meeting report is TD- 93(WP2/16). TD-43(WP2/16) was the status of Q12/16 at the beginning of SG16; TD-17(WP2/16) is a

summary of the two interim meetings that were held. Q12/16 will meet twice, jointly with Q13/16 and Q14/16, before the next SG16 meeting in September 1998 (see the CSR calendar). The following two draft Recommendations were Decided by SG16 with no changes: • H.222.0|ISO/IEC 13818-1, Generic coding of moving pictures and associated audio information: Systems, Amendments 3 and 4, as shown in COM 16-29© • H.321 Version 2, Visual Telephone Systems and Equipment for Local Area Networks, as shown in COM 16- 39© The correction to H.310 was approved as shown in COM 16-55©. H.BMULTIPOINT TD-31(WP2/16)© is draft Recommendation H.bmultipoint, Multipoint Extension for Broadband Audiovisual Communication Systems and Terminals. Q12/16 reviewed this draft to resolve outstanding issues. The Editor (H. Harasaki, NEC Japan) produced a revised draft in TD-67(PLEN)©, which was Determined by SG16. H.222.0|ISO/IEC 13818-1 A MENDMENT 5 TD-15(WP2/16) is a draft for Amendment 5 to Rec. H.222.0. It was Determined by SG16 as TD-78(PLEN). OTHER TECHNICAL TOPICS D.122 (France Telecom/CNET) proposes an interface to be defined between an AAL card and H.320 equipment for implementing an H.321 terminal. Q12/16 agreed to seek advice of Q6/16, Q7/7 and Q8/7 by sending a liaison statement (TD-25(GEN)), regarding the DTE/DCE interface for H.310). Q12/16 may consider adding an Appendix to H.321 describing this interface. In the course of H.310v2 and H.bmultipoint discussions, Q12/16 identified the following two additions which should be included in H.245 Version 4: • Gateway capability in terms of gateway addresses, gateway types, multiplex functions • Setup entity of the additional VC for multipoint communications Exact syntax and semantics will be worked out by the Rapporteurs meeting in April. In addition to continual incremental improvements to H.310 and H.bmultipoint systems, the following items are for future work awaiting contributions: • H.310 communication security • VBR aspects • H.310 interworking with other H-300 series terminals LIAISONS The meeting reviewed two incoming liaison replies from SG11: • TD-10(WP2/16), Q2941.1 Endpoint Identifier • TD-11(WP2/16), Q2931 AAL type indication for H.310

Deletion of the use of B-HLI to transport H.310 CorrelationID was done as pointed out in TD-10(WP2/16). The requirement for new codepoint “End Station Identifier” is conveyed in a liaison reply TD-60(WP2/16). The new definition of AAL type indication for H.310 in Q.2931 was reflected in the updated draft of H.310. Q12/16 noted that SG11 did not have time to consider a new IE (Information Element) for clock source indication at its meeting in September 1997. TD-8(WP2/16) is a liaison from ISO/IEC JTC1/SC29/WG11 regarding coding of audio, picture, multimedia and hypermedia information. The current DMIF CD is not clear in the relationship between the ISO/IEC standard and the ITU-T Recommendation. This general comment and other H.310 specific comments are to be conveyed to MPEG with other comments from other SG16 Questions in TD-79(WP2/16) as a liaison. Table 2 is Q12/16’s updated work plan.

Q13/16 WP2, PACKET SWITCHED MULTIMEDIA SYSTEMS AND TERMINALS The Rapporteur is D. Skran (Ascend, US). The meeting report is TD-98(WP2/16). TD-33(WP2/16) is the status report of Q13/16 since the last SG16 meeting. Q13/16 will meet twice, jointly with Q12/16 and Q14/16, before the next SG16 meeting in September 1998 (see the CSR calendar).

Study subject Editor Det. Dec. H.222.0|ISO/IEC 13818-1 Amendment 5 S. Okubo (GCL - Japan) 98/01 98/09 H.310 Version 2 K. Sakai (Fujitsu - Japan) 98/01 98/09 H.bmultipoint (broadband multipoint systems) H. Harasaki (NEC - Japan) 98/01 98/09 Security for broadband systems* {solicited} TBD TBD VBR aspects M. Nilsson (BT - UK) TBD TBD H.246 Annex (broadband system interworking) {solicited} TBD TBD *Security for broadband systems address ATM specific considerations; generic specifications are covered by H.235. Table 2. Updated Work Plan for Q12/16. LIAISONS TD-11(PLEN) is SG7’s reply to a liaison from SG16 on initiation of Collaborative work on “Internet Telephony.” Q13/16 did not send a reply in return. TD-13(PLEN) is a liaison from SG7 alerting ITU-T Study Groups on Registration and Soliciting Input. It was accepted for information. TD-14(PLEN) is a liaison from SG7 Q22/7 on conforming to the current ASN.1 version. Q13/16 editors believe that Q13 documents already conform, but they will check with B. Scott, the ASN.1 editor, and take up his offer of a review of the ASN.1 syntax of H.225.0v2, H.323v2, etc. TD-12(WP2/16), a liaison from Q6/11 on separation of call and bearer control, was discussed; no response will be produced. TD-12(GEN) is a liaison from SG13 WP4 announcing work on an Internet Protocol Performance Rec. I.351P; no response is needed. TD-15(GEN), Speech Quality aspects of “Internet Telephony”, is a liaison from SG12. TD-85(WP2/16) is the response. It includes an excerpt from H.323v2 to describe how each low bitrate coder should be used. The current version of DMIF, ISO/IEC 14496-6 (TD-8(WP2/16) from ISO/IEC JTC 1/SC29/WG11 is the incoming ISO/IEC liaison (see http://drogo.cselt.it/mpeg/ for the full document), was examined. ISO/IEC 14496-6 is now a CD, is undergoing verification, and is projected to achieve the status of a Final CD in July 1998. Annex B of this document is “Use of the ITU-T SG16 H Series Recommendations.” This was discussed in a joint Q11/12/13/14 meeting. TD-99(WP2/16) is the SG16 liaison response. The large number of requested changes to the H Series will be considered as input to future H.323v3 and H.245v4. SG16’s concerns are noted about the “heaviness” of the DMIF protocol and the inclusion of H.323 in DMIF. Clarifying comments related to H.310 are also included. H.323V2 COM 16-54© is H.323v2, Packet based Multimedia Communications Systems, for Decision at this meeting. D.120 notes that the current fast start scheme in H.323v2 does not offer benefit for services coordinated by a central entity. Such services are estimated to represent 40% of the market. Changes accepted from D.120, Comments on H.323 Fast Call Setup (BT), are shown in TD-58(WP2/16). TD-9(PLEN), Editorial Changes to COM-16- 54©, was approved. Some additional T.120 setup clarifications appear in TD-69(WP2/16). They were approved for inclusion in H.323. TD-34(PLEN), More Editorial Changes to H.323 (Rapporteur), was approved with some changes. Final text for H.323v2 appears in COM 16-54© plus the unified H.323 change document TD-72(PLEN). It was agreed that issues exist implementing multi-unicast multipoint conferences. A proposal to address this problem with changes for the H.323v1 implementors guide and for H.245 appears in TD-68(WP2/16). Changes were put forward for H.245v3 and for the H.323v1 Implementors Guide (TD-69(PLEN)). No changes were made to H.323v2, although it was agreed that at the next meeting the comments in the H.323v1 implementors guide would be added to the H.323v2 implementors guide.

TD-76(WP2/16) (J. Ott, Teles) contains a solution to handling some difficulties relating to the identification of H.263 capabilities and payload types. It proposes that rtpPayloadType be extended by a pointer to the semantics of the payload type. This text will be added into H.245v3, and H.225.0v2 for Decision. H.225.0V2 The corrections to H.225v2, Call Signaling Protocols and Media Stream Packetization for Packet-Based Multimedia Communications Systems, in TD-29(PLEN) were reviewed and accepted. It was agreed to reference IETF RFC 1290 in H.225.0v2 (see discussion item in TD-33(WP2/16), the Q13/16 status report). The complete text of H.225.0v2 is found in COM-16-49© and TD-68(PLEN), which is an updated version of TD-29(PLEN). H.323.0 ANNEX B (LAYERED VIDEO CODING) H.323 Annex B (Layered Video Coding) is shown in COM-16-54©. There were no additional inputs at this meeting. This was Decided as part of H.323. H.323.0 ANNEX C (H.323 ON ATM) H.323.0 Annex C (H.323 on ATM) was worked jointly with Q12/16. COM-16-54© is the draft going into this meeting. D.138, Comments on Annex C of H.323 (G. Ratta, Lucent), includes both editorial and also some general comments. Some of the points were accepted, others accepted with modification. Some examples: If an ATM call fails, the call continues using basic mode. Text will be added to H.323 to explain this point. A liaison to SG11 in TD-77(WP2/16) requests a possible Q.2931 codepoint identifying the lack of end-to-end ATM connectivity to aid the implementor in creating a better product. It calls for a more efficient voice packetization when using RTP over ATM. This issue will be addressed in the H.225.0v2 implementors guide. TD-2(WP2/16), H.323 Media Transport over ATM (ATM Forum), discusses voice stream packetization for H.323 over ATM in both the basic mode of operation (interworking with other network technologies) and in the native ATM mode of operation. It includes a table of ITU voice coders identifying frame sizes used over different networks. The table identifies the advantage of using H.323/H.225 over ATM without RTP. It was reported that future work of the ATM forum would focus more on H.323 since H.310 is complete. TD-3(WP2/16), Work on ATM Aspects of H.323 (ATM Forum), calls for more attention to the packing of RTP/Voice into ATM cells in H.323 and notes how this might be more efficient. It was agreed to consider for future work, specifically H.323v3, a more efficient mode of packing voice over ATM. Ideas to consider include: • Compressing RTP headers • Not using RTP but only for voice in special trunking circumstances, putting voice directly over the AAL. • Other methods. Advice for putting RTP more efficiently over ATM will be put in the H.323v2 Implementor’s Guide based on the input from the ATM Forum. H.246 and GW work will take into account efficiency of packing in connecting H.323 to ATM native voice to avoid needless inefficiency, but there is no mandate or direction for direct interoperability as H.323 and native ATM voice are at different protocol levels. A liaison to the ATM Forum reporting on the activities at this meeting, in particular regarding RTP packing, appears as TD-75(WP2/16). H.332 [FORMER H.LOOSELY COUPLED] H.332 (former H.Loosely Coupled) Version 1 was Determined in March 1997. It appears in COM 16-41©. The editor is V. Kumar (Intel, USA). Two documents from Korea, D.141, Proposal of Multicast Architectures for Loosely Coupled Conference Receivers, and D.142, Proposal of Additional Procedure for Conference Establishment, were discussed. D.141 proposes two architectures, one using existing multicast network (e.g., MBone), the other to build a new multicast

network dynamically during a conference, for involving RTP/RTCP loosely coupled receivers. It was decided that these documents are directed toward future versions of H.332. TD-33(WP2/16), the Rapporteur’s Q13 status report, reviews issues relating to the RFC reference not being available for H.332, Multimedia Terminal for receiving Internet Based H.323 Conferences (H.loosely-coupled) by February, 1998. Although there are no changes requested to the text, this document cannot be decided since a key IETF RFC has not yet been granted an RFC number. Thus, it was agreed to “freeze” the text of H.332, to re-Determine it as COM-16- 41©, and Decide the document at the September 1998 SG16 meeting. H.450.1, H.450.2, H.450.3 H.450.1, Generic Functional Protocol (QSIG based), appears in COM 16-42©. H.450.2, Call Transfer, appears in COM 16-43©. TD-22(PLEN) notes editorial changes to both documents. Both were Decided as their respective COM documents plus TD-22(PLEN). H.450.3, Call Diversion, was Decided as COM 16-44©. H.323/H.225.0 ANNEX D FOR REAL TIME FAX TD-9(GEN) is a liaison from Q4/8, including draft Recommendation T.Ifax2 (Real Time G3 Communication Between Terminals using IP Networks), requesting SG16/WP2’s help on the issue of H.323 call control. A response appears as TD-65(WP2/16), with a final version in TD-101(WP2/16) which includes a draft Annex B for T.ifax2. Related documents include: • TD-42(WP2/16), Draft Annex for H.323: Real Time Fax over Packet Networks (Rapporteur Q13/16) • TD-45(WP2/16), Draft Annex B for T.ifax2 (Rapporteur Q13/16) • TD-48(WP2/16)©, Draft T.ifax2 (Rapporteur SG8/Q4) • TD-47(WP2/16), Report on Q4/8 Rapporteurs meeting (Rapporteur SG8/Q4) V. Kumar (Intel) will be editor of Annex D/H.323. See TD-62(WP2/16), Draft H.323 Annex D (Real Time Facsimile over H.323), and also TD-54(WP2/16), Requirements for Real-Time Fax over Packet Networks using H.323. The requirements of TD-54(WP2/16) were agreed with some modifications, and are shown in TD- 78(WP2/16). Key requirements identified include: • Use T.ifax2 • Interoperable with H.323v2 • Ability to switch between voice and fax • Simultaneous voice and fax when both terminals are H.323 • T.4/T.30 on TCP is mandatory • UDP is optional • Gatekeepers can identify H.323 facsimile calls These requirements are included in TD-80(WP2/16), a revised version of H.323 Annex D. H.323 Annex D was Determined as TD-71(PLEN). It is planned for Decision in September 1998. H.225.0 ANNEX I (H.263+ PACKETIZATION) TD-13(GEN) is a new H.225.0 Annex I describing an RTP payload format for video data encoded according to the 1998 H.263 (H.263+). It was Determined by SG16 as Annex I to H.225.0, and is expected to be Decided in September 1998. G. Freundlich (Lucent, USA) is the editor. There appears to be a problem going forward since IETF may no longer assign fixed payload types; this raises many issues for H.263++ and beyond. This problem is solved by the adoption of the method of TD-76(WP2/16) in H.225.0v2, and H.245v3. H.323V3 H.323v3 is expected to be ready for Determination in September 1998. G. Thom (Delta Information Systems, USA) is the editor. TD-30(PLEN) is a liaison on Internet Telephony Numbering Issues from EP (ETSI Project) TIPHON. TIPHON requests that Q13/16 send a liaison to SG2 and requests support for a global internet telephone number. This is either a “telephone domain name” or a “DTMF compatible H.323 alias” or “an identifier routable by the

PSTN/ISDN/GSM” depending on how it is viewed. Q13/16 supported the request; a liaison to SG2 appears as TD- 57(WP2/16), with the final version in TD-100(WP2/16). COM 16-58©, Draft new Annex for the H.323 Recommendation (PPP-over ISDN, from France Telecom), was discussed and agreed as the basis for further work. There was no opposition, but it was mentioned that this work should be extended to ADSL as well as ISDN, and that there may be no need for an annex per se. The importance of using H.dispatch was mentioned as the main reason for the Annex. J.P. Blin (FT) will provide Annex text to the H.323 editor toward H.323v3. Future topics for H.323 work include: • Frame Relay cut-through mode similar to the ATM mode • G.726/G.727 as coders • GK/GK relationships • Scaling for Internet operations • H.246 GW requirements, esp. for H.323 to PSTN connections • What are the mandatory differences between V1 and V2? (for implementors guide) • DMIF & H-series work • MPEG4 audio and video in H.323 • Firewall issues • Browsing features (Who is registered on this GK?, etc.) • A/V control now joint with Q14 (new H-series rec.) • H.323 over ADSL & other PPP transports; work with Q4 of SG15 • More reliable MCs in distributed conferences • H.323 mobility across various networks (May be implemented by call diversion, GK, or other ways) • Fixed capability terminals • Efficiency improvements to H.323 • Improved methods to increase QoS (Specification of QoS signaling for cut-through modes) • Chat in H.323 With regard to chat in H.323, it was agreed that in the short term, T.134/T.140 can run over T.120. Study of a non- T.120 means of “chat” in H.323 is for the future. Consideration will be given to adding GSM references in the H.323v2 implementors guide. H.323/H.225.0 ANNEX FOR FIXED CAPABILITY TERMINALS Three documents from the Rapporteur (drafted by J. Ort, Teles), were presented. TD-64(WP2/16) is the report of a small ad hoc group meeting to discuss requirements and issues for H.323 terminals with limited capabilities such as palmtops computers, cellular IP phone, telephone with NIC, etc. TD-66(WP2/16) discusses possible requirements and issues for fixed capability terminals. Support was expressed for small, inexpensive devices that are compatible with H.323 terminals. TD-67(WP2/16) discusses a set of performance/efficiency issues related to H.323 terminals. These issues will be considered in the future development of H.323v3 and in the development of fixed capability terminals. The plan is to Determine an H.323 Annex at the September 1998 SG16 meeting. An editor is solicited. H.225.0V3 D.104 is an overview of the PictureTel Transform Codec (PTC). PTC is low complexity (13.9 MIPS on a TMS320C50) wideband codec, coding audio up to 7 kHz in bandwidth. Three bit rates are supported: 16 kbit/s, 24 kbit/s and 32 kbit/s with a 20 ms frame. PTC is intended for use in ISDN telephony and videoconferencing applications. G. Freundlich (Lucent, USA) is the editor. As this coder was chosen (see Q20/16 report below), it is expected to be ready for Determination in September, 1998. NEW SUPPLEMENTARY SERVICES WORK • Candidates items for the H.450.x implementor’s guide contents include: • Clarifications • Correction of found errors • Definition of subsets, e.g., H.450.1 transport for proprietary features • Interaction and use of supplementary service with different types of calls, e.g., Fax calls, Video calls, Calls with application sharing 32 Vol. 9.2 Copyright © CSR 1998 March 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS

Topics for a tutorial on H.450.x might include: • How to use H.450.1: –For standardized supplementary services –For transport of manufacturer specific functions over H.323 -Proprietary extensions of standardized functions -Proprietary supplementary services • How to use H.450.2 Call Transfer • How to use H.450.3 Call forwarding • How does H.450.x interwork: –with QSIG and –with public ISDN –with B-QSIG • How do supplementary services interact? The future work on supplementary services should be carried out on features that have the highest importance for the SG16 member organizations. The following features were suggested: • Call Hold / Retrieve • Call Park / Unpark (also called Call Pickup) • Transition from consultation to 3-party Conference • Call Treatment (part of call hold or waiting) The following supplementary services have been already discussed in the past SG16/WP2 rapporteur meetings, but postponed for future consideration: • Call Identification (Calling Party Number Restriction, Names) • H.323 mobility Further candidates can be derived, e.g., out of various Q13/16 discussions: • Silent monitoring Further ISO QSIG Features available for consideration include: • Message Waiting Indication • Advice of Charge • Call Intrusion • Call Offering • DND / DND Override • Call Completion Busy Subscriber / No Reply • Recall • Interception • Transit Counter / Loop avoidance • Common Information (i.e. supplementary service capabilities) • Path Replacement Draft Recommendations H.450.4, H.450.5, and H.450.6 are expected to be ready for Determination in September 1998. M. Korpi (Siemens, Germany) is the editor for all three documents.

Q14/16 WP2, COMMON PROTOCOLS, MCUS AND PROTOCOLS FOR INTERWORKING WITH H.300- SERIES TERMINALS The Rapporteur is G. Thom (Delta Information Systems, US). The meeting report is TD-90(WP2/16). Q14/16 addresses improvements and extensions to MCUs, gateways between AVMMS on different network types, and common protocols to ensure interworking and harmonization of AVMMS systems. M. Reid (VideoServer, USA) chaired the meetings in the absence of the Rapporteur. TD-17(WP2/16) contains a report on the Q14/16 work since the last SG16 meeting in March 1997. TD-51(WP2/16) provides a brief summary of the current Question 14 status. The agenda is contained in TD-39(WP2/16) and TD-52(WP2/16). Q14/16 will meet twice, jointly with Q12/16 and Q13/16, before the next SG16 meeting in September 1998 (see the CSR calendar). Q14/16 correspondence is primarily through email using the [email protected] reflector and the gcl ftp site, ftp://itu-t:[email protected]/.

H.235 The white contribution of H.235, Security and Encryption for H-series (H.323 and other H.245 based) Multimedia Terminals, is contained in COM 16-40©. Comments received in TD-1(PLEN) and D.121 were approved. H.235 was Decided as COM 16-40© plus TD-1(PLEN) and D.121. H.246 The white contribution of H.246, Inter-working of H.series Multimedia Terminals with H.series Multimedia Terminals and Voice/Voiceband Terminals on GSTN and ISDN, is contained in COM 16-38©. Comments received in TD-4(PLEN) were approved. H.246 was Decided as COM 16-38© plus TD-4(PLEN). H.245 VERSION 3 The white contribution of H.245 Version 3, Control protocol for Multimedia Communication, is contained in COM 16-53©. Comments were received in: • TD-2(PLEN), Editorial changes (Q14/16 Rapporteur) • TD-23(PLEN), Required changes (Q11/16 Rapporteur) • TD-22(PLEN), Editorial changes (Q13/16 Rapporteur) • D.120, Comments on H.323 Fast Call Setup (BT, UK) • TD-20(WP2/16), Add a Codepoint to H.245 (Q11/16 Rapporteur) Note: The electronic COM 16-53© available via FTP (ITU TIES registered users only) is missing the last portion of the H.245 document. Printed versions of COM 16-53© are correct. TD-20(GEN) was presented as the aggregation of the changes contained in TD-2(PLEN), TD-23(PLEN), TD-22(PLEN) and TD-20(WP2/16). It was noted that titles of Recommendations H.323, H.225.0 and V.34 require updating as listed in the reference section of TD-20(GEN). TD-20(GEN) was rolled into TD- 73(PLEN) which contains the final proposed additions to H.245v3. The changes proposed in D.120 (Comments on H.323 Fast Call Setup, BT, UK) were not accepted. TD-68(WP2/16) represents the results of the ad-hoc group meeting on multi-unicast H.323 conferences; it was accepted as a correction to H.245v3. The agreed text is provided in TD-73(PLEN). TD-76(WP2/16) summarizes the ad-hoc group discussions on payload formats in H.245 for H.225 Media Packetization. This document was accepted with changes. The revised text relative to H.245 appears in TD- 73(PLEN). H.245 Version 3 was Decided as COM 16-53© plus TD-73(PLEN). H.245 VERSION 4 H.245v4 is based on Decided text of H.245v3. In a joint meeting between Q11, Q12, Q13, and Q14, TD-3(PLEN), Draft Recommendation H.245 Version 4, was presented and accepted as the proposed additions to H.245 for Version 4. Although not included in TD- 3(PLEN), the group agreed that additions to support AL1 to AL5 gateways (e.g., gateway addresses, gateway types, and multiplex functions) and commands to enable the set up of additional VCs for multipoint communications will be included. The group also agreed that additions to support the real-time fax standard would be included in H.245 Version 4. Details of these additions will be included in the white document. The contents of TD-3(PLEN) were incorporated into TD-74(PLEN) which contains the final additions for H.245v4. TD-80(WP2/16) provides the text for a proposed H.323 Annex D Facsimile protocol. It requires additions to H.245v4, which are included in TD-74(PLEN). TD-24(PLEN) contains the results of an ad hoc committee reviewing the H.245 Recommendation. It proposes treating the syntax, semantics, and possibly the SDL diagrams portion of Recommendation H.245 in a manner similar to that for source code. These portions were proposed to be distributed in only one language and by electronic media only. The group agreed to move the standard forward for Determination with this editorial reorganization. H.245v4 was Determined by SG16 as H.245v3 plus TD-74(PLEN).

H.MEDIAMIB Draft Recommendation H.MediaMIB describes management information structures that can be used to manage the resources of H.3xx-series terminals, gateways, MCUs, and other entities. The goals for the document are a SNMPv2 based MIB (Management Information Database) with emphasis on configuration, performance, fault discovery, and fault isolation initially focused on H.323 common protocols. Later phases of the work will add other ITU-T H.series terminals and inter-networking devices and detailed media codec definitions. H.323 common protocols will include H.225 Q931, H.225 RAS, H.245, RTP, and potentially T.120. G. Kajos (VideoServer, US, editor) presented TD-53(WP2/16), a slide presentation of a proposed work plan for the H.MediaMIB recommendation, noting the importance of SNMP management to H.323 product sales. A detailed explanation of the presentation is in TD-38(WP2/16). This segments the work into three phases: • Phase 1 common H.323 protocols, • Phase 2 Audio/visual terminal devices and internetworking entities, • Phase 3 H series media codecs. There was consensus on moving this work forward as outlined in TD-38(WP2/16), with initial detailed proposals expected for the April Q14 Rapporteur’s meeting. H.MediaMIB will be targeted for Determination at the September 1998 SG16 meeting. The importance of IETF collaboration was emphasized as this work moves forward. TD-40(WP2/16), a draft IETF RTP MIB, was presented. H.MediaMIB will reference this work as the work progresses. H.235V2 A discussion was held on future work for H.235. The top level goals include non-repudiation, message and media integrity, input into H.MediaMIB for security information, and security profile definitions which can be defined in non-normative appendixes. H.246 ANNEXES Q14/16 met jointly with Q18/16, Q13/16, and Q12/16 to continue collaboration on the interaction between H.323 and the GSTN. M.H. Sherif (Rapporteur for Q18/16) presented: • COM-16-50©, Report of the Rapporteur’s Meeting in Amsterdam, NL, 26-27 June 1997 • COM-16-51©, Analysis and examination of the IETF proposed algorithm for compressing the RTP/UDP/IP headers • TD-49(WP2/16), Internet Draft on Compressing IP/UDP/RTP Headers for Low Speed Links (draft-ietf-avt- crtp-04.txt) • TD-50(WP2/16), Report of Q18/16 Interim Activities and Workplan for this Meeting. The following agreements were reached: • H.246 Annex B will focus on H.323 to speech terminals on the GSTN and be the next annex developed for the standard. • H.246 Annexes defining interworking between H.323 and V.70 terminals on the GSTN and H.323 and H.324, terminals on the GSTN will be developed. Multimedia connections would use H.324, and speech/ data applications would make use of V.70. As part of this work, H.323 will be reviewed to verify that the signaling and procedures required to take advantage of multi-call applications on the GSTN side of a gateway can be signaled from a H.323 endpoint. • Multi-call applications on the GSTN will be supported using H.324 or V.70. Although a new protocol as described in TD-50(WP2/16) will not be specified as part of this work, modifications to other existing protocols may be required. Q14/16 also met jointly with Q11/16 to continue collaboration on the H.323 to H.324 H.246 Annex, and with Q12/16 to continue collaboration on the H.310 inter-working Annexes. Proposals in these areas were encouraged. TD-14(GEN) (Rapporteur Q9/16 G. Hellström) proposes that a V.18 to H.323 annex be included in H.246 as a future work item. It was accepted. Specific proposals in this area were encouraged. This document also requests H.246 cover the interactions between the H.Series protocols and current text telephones.

T.120 SECURITY Q3/16, Q12/16, Q13/16, and Q14/16 met jointly to discuss security issues. D.110 provides the beginning of a security architecture for T.120 and a detailed methodology for moving the work forward. Q3/16 and Q14/16 agreed to continue to cooperate and coordinate on security issues as they pertain to the T.120 security work and H.235v2. See Q3/16 report above for additional details.

Q15/16 WP3, ADVANCED VIDEO CODING The Rapporteur is G. Sullivan (PictureTel, US). The meeting report is TD-47(WP3/16). Q15/16 held three interim experts group meetings since the last meeting of SG16. The status and results of those meetings were reported: TD-09(WP3/16), TD-08(WP3/16), TD-06(WP3/16), TD-10(WP(3/16). Q15/16 plans two interim Rapporteur’s group meetings before the September 1998 meetings of SG16 (see the CSR calendar). Q15/16 currently has two ongoing primary projects. The first project consists of the development and standardization of new optional enhancements to the Recommendation H.263 video codec standard for real-time telecommunication and related non-conversational services. The first set of such enhancements, known as “H.263+” or as H.263 version 2, was Decided by Study Group 16, as COM-16-26© plus editorial changes in TD- 25(PLEN). Q15/16 also plans to continue to develop further enhancements to H.263 as a future work item, now known as “H.263++”. The second ongoing project of Q15/16 is currently known as H.26L; it consists of a development effort intended to identify new video coding technology beyond the capabilities of incremental enhancements to H.263, for longer-term standardization. The H.26L project reached a significant milestone at this meeting in the issuance of a “call for proposals” for algorithms suitable for consideration. In addition to this focus on future needs, Q15/16 is charged with maintaining the prior video coding standards (H.261, H.262, and H.263, and presumably H.120) as necessary. K. Hibi (Sharp/CIAJ, Japan) is the new Associate Rapporteur, replacing M. Zeug, and is now leading the H.26L project. G. Sullivan (PictureTel, US) was designated as a Liaison Rapporteur to ISO/IEC SC29/WG11 (MPEG) for coordination and communication regarding the relationship of future video standardization activity in MPEG. ELECTRONIC COMMUNICATIONS The primary means of document distribution within the Q15/16 Video Coding Experts Group is electronic. Q15/16 documents can be found on an ftp site that is maintained by G. Sullivan of PictureTel: ftp://standard.pictel.com/video-site Q15/16 conducts its email conversations over an email reflector maintained by M. Zeug (Iterated Systems): [email protected] Requests for subscriptions and “unsubscriptions” for this email reflector should be sent to the list manager: [email protected] AMENDMENTS 3 AND 4 TO REC. H.262|ISO 13818-2 (MPEG-2 VIDEO) The draft amendments 3 (Multiview Profile) and 4 (Extension Code Assignment) to Recommendation H.262|ISO/IEC 13818-2 (MPEG-2 video) were Decided, as COM-16-30©. H.263 WORK The H.263+ project was completed at this meeting with the Decision of Version 2 of Recommendation H.263, consisting of COM-16-26© (G. Sullivan, Q15/16 Rapporteur) with editorial changes as provided in TD- 25(PLEN) (G. Sullivan, Q15/16 Rapporteur). The work toward adoption of H.263+ into H.320 and H.242 will progress toward Determination in September 1998. Q15/16 has helped develop and submit a Real Time Transport Protocol (RTP) payload packetization for H.263+ that is to be Determined as an annex to H.225.0 once the RFC (Request for Comments) number is available. Currently the reference is to draft-ietf-avt-rtp-h263-video-01.txt of the Audio/Video Transport Working Group of the IETF This matter is discussed in TD-13(GEN) (G. Sullivan, Q15/16 Rapporteur and D. Skran, Q13/16 Rapporteur). TEST MODEL AND SOFTWARE No documents were submitted which directly affect the test model TMN9, or software development. However, a few comments arose during the meeting which affect these areas: 36 Vol. 9.2 Copyright © CSR 1998 March 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS

1. Q15/16 has not yet issued a new version of its test model reference encoder description document, but the small number of deficiencies noted in it from the last Q15/16 meeting report remain. Q15/16 continues to have a goal toward continuous measurable improvement in the test model reference encoder description, hopefully achieving a 1 dB performance improvement or better relative to TMN9. 2. It was remarked that the test model document seems to make no mention of rounding control or the use of RTYPE (Rounding Type). It should state that RTYPE is, for example, set to 1 on any Intra picture and that RTYPE is always negated in each predicted picture relative to its value used in its temporally-previous reference picture. PLANNING AND WORK ON H.263++ Q15/16 discussed the current status of work on H.263++ and noted four key technical areas that have been shown to the group in this category that appear to be promising for further investigation: 1. Data partitioning with reversible Variable Length Codewords (VLCs) (e.g., Villasenor et al) 2. 4x4 MC+DCT (e.g., Bjontegaard) 3. Adaptive quantization (e.g., Bist) 4. Long-term/Background memory (e.g., Wiegand et al) Although these areas appear worthwhile for investigation, none appear to be fully mature in terms of having both a sufficiently stable technical proposal and a high level of proven effectiveness and necessity confirmed by an independent implementation experiment. Although the necessary justification for some of these proposals may yet arise, it appears that it is possible that Q15 experts will not actually create a first draft of H.263++ at their next meeting. Even if this occurs, Q15/16 presently plans to keep the rest of the scheduled target dates as planned (Table 3). H.26L The H.26L project reached an important milestone at this meeting, completing the Call for Proposals. The H.26L project appears to be on track (Table 4), and will be led by Associate Rapporteur, K. Hibi (Sharp/CIAJ, Japan). TD-11(WP3/16) (G. Sullivan, Q15/16 Rapporteur), is the draft Call for Proposals. The final H.26L “Call for Proposals,” is attached in Annexes Q15.B through Q15.E to TD-47(WP3/16) the Q15/16 report. These Annexes are: • Annex B, Call for Proposals H.26L Mtg Approx Date Type Milestone d 26 Jan 1998 SG16 e 21 Apr 1998 Experts First Formal Draft Adoptions f 21 Jul 1998 Experts g 14 Sept 1998 SG16 h Nov 1998 Experts Last Formal Draft Adoptions i Jan 1999 Experts j Mar 1999 SG16 k Jul 1999 Experts l Nov 1999 Experts Final Draft for Determination m Feb 2000 SG16 Determination n Apr 2000 Experts Bug-checking o Jul 2000 Experts Final Draft for Decision p Nov 2000 SG16 Decision Table 3. Q15/16 Workplan on H.263++

Mtg Approx Date Type Milestone d 26 Jan 1998 SG16 Issue Call for Proposals e 21 Apr 1998 Experts f Jul 1998 Experts g 14 Sept 1998 SG16 h Nov 1998 Experts 1st Formal Evaluations i Jan 1999 Experts First Draft Text and Test Model j Mar 1999 SG16 k Jul 1999 Experts l Nov 1999 Experts Final Major Feature Adoptions m Feb 2000 SG16 n Apr 2000 Experts o Jul 2000 Experts p Nov 2000 SG16 q Apr 2001 Experts r Jul 2001 Experts s Aug 2001 SG16 Determination t Oct 2001 Experts Bug-Checking u Jan 2002 Experts White Document Generation v May 2002 SG16 Decision Table 4. Q15/16 Work Plan for H.26L • Annex C, Simulation Conditions for H.26L proposals • Annex D, H.26L Evaluation Delay Model User Guide • Annex E, H.26L Requirements Document Some aspects of the conditions for simulation experiments may need further refinement prior to the planned November proposal evaluations. Some Q15/16 members also expressed an interest in having some examples of analysis of some algorithms by use of the specified delay model, in order to promote a better understanding of the model, especially when encoder processing time is not negligible but some bits are being delivered to the channel during encoding. One such example could be test model operation using P pictures operating over a fixed bit-rate channel, and another could be operation on a Local Area Network (LAN) environment (allowing bursty use of the channel rather than a fixed bit rate flow). STUDY OF KEY APPLICATION DEMANDS (E.G., SIGNING) Q15/16 discussed the needs of video coding application for sign-language and lip-reading use. Q9/16 drafted an “application profile” (TD-26(GEN)) to guide work in this area, noting the needs for high-quality, high-frame rate video for this use, and two video test sequences were offered for use by Q15/16 in video codec experiments, as discussed in TD-16(GEN) (G. Hellström, Q9/16 Rapporteur). An interest was expressed in investigating what bit rates were needed for moderate and good levels of quality for encoding the new signing test sequences using an example encoder such as the current test model of the Q15/16 group. TD-01(GEN) (G. Sandini, University of Genova) contains a description of a new type of video source format termed space-variant resolution, in which the pixels in the coded picture do not represent an equally-spaced rectangular sampling grid. Instead, the pixels form a sort of polar-coordinate sampling grid in which more pixels are devoted to the center of the picture. The design is reportedly addressed toward sign-language and lip-reading applications. In response, Q15/16 seeks a demonstration of the performance of such an approach relative to what can be achieved by use of existing standards without alteration, in particular judging performance relative to space-varying bit-rate optimization within current standards. A considerable perceptual benefit must be seen in order to adopt customizations for such sensors and displays. The proposal did not include information concerning whether intellectual property rights were claimed for this new technology. It was noted that even if this feature is not specifically adopted into H-series terminals, non-standard capabilities could be negotiated to support this proposed use.

COMPATIBILITY BETWEEN MPEG-4 AND H.263 AND BITSTREAM EXCHANGE The issue of compatibility with MPEG-4 was discussed. Bitstream exchange testing is under way between an implementation of H.263 and the MPEG-4 software (Telenor and KPN Research). The initial bitstream exchanges have been successful. This is an important demonstration of MPEG-4 and H.263 (version 1) compatibility. Q15/16 is pleased that MPEG resolved in Stockholm to consider compatibility between the MPEG-4 video committee draft and ITU-T Rec. H.263. Q15/16 believes that since the drafted core syntax of MPEG-4 video already corresponds very closely to H.263, it will be beneficial to those interested in using either of these important standards if full compatibility can be achieved for this core syntax. Q15/16 has studied the MPEG-4 visual Committee Draft (CD) (MPEG document N1902) and Q15/16’s understanding is that only a few minor changes to it are needed in order to achieve strong compatibility. The precise nature of those changes is described below. Due to the minor nature of the differences, Q15/16 supports having a requirement that all MPEG-4 video decoders be capable of decoding the H.263 “baseline” video bitstream syntax. H.263 ENCODING WITH MPEG-4 DECODING Q15/16 has found only a few very minor alterations to MPEG-4 which would need to be made to ensure the capability for the decoding of H.263 bitstreams (using baseline or advanced prediction operation) by an MPEG-4 decoder: 1. Header support: the format of the picture, Group of Blocks (GOB), and End of Selection (EOS) headers. 2. Altering the entropy coding of INTRA Coefficients by: a) Allowing luma INTRA AC coefficients to be coded with the same TCOEF (Transform Coefficent) Variable Length Codeword (VLC) table as for INTER. b) Adding a (small) FLC table to define INTRA DC inverse quantization (12 lines of text in table body). 3. Using the “type 3” DCT coefficient escape code (implicitly) without its “11” suffix. (Note: Item 3 of this list seems to have been arisen after the draft which was available in Stockholm when the incompatibility issue was studied and MPEG’s resolution on this topic was made [N1642 VM7 from Bristol]. The CD is actually self-contradictory on this topic, with the paragraph at the end of Section 7.3.1.2 saying the H.263 method is used, in contradiction to the text of the next section (Section 7.3.1.3). The alteration seems to have first appeared in some form in Stockholm’s N1796 VM8 and then to have been altered again in the creation of the Fribourg N1902 CD. The recent alterations and the self-contradiction in the CD appear to explain why Q15/16 did not find this particular problem sooner.) Q15/16 believes that it should be specified that there are two video header formats in MPEG-4, one of which is MPEG-4’s more full-featured header format, and an alternative (H.263v1-style) header format. When the alternative header format is used, the other two changes would be implied. MPEG-4 ENCODING WITH H.263 DECODING There are many optional features of an MPEG-4 encoder. If the above aspects are harmonized and a couple of such features are not used, this will also enable the decoding of MPEG-4 bitstreams by an H.263 decoder (the flip side of the compatibility coin). This harmonization and use requires: not sending two types of motion-related codes, unless advanced prediction (OBMC) is also used: a) Motion vectors which require extrapolation of the picture boundaries, or b) Macroblock type codes using four motion vectors If MPEG-4 adopts the changes listed in the previous section, Q15/16 advises that it should be required that these restrictions of choices are also in effect when the H.263-style header format is in use. LIAISON STATEMENTS Q15/16 drafted a liaison statement (TD-46(WP3/16)) to send to ITU-R WP11A regarding their new Question on the topic of bit rate reduction processing of digital TV signals. Q15/16 expressed interest in this requirement and is willing to consider adding work items to fulfill the needs of ITU-R WP11A. Q15/16 also drafted a liaison statement (TD-45(WP3/16)) to ITU-R WP11A regarding their work on the topics of adaptive image quality control and the assessment and optimization of the quality of color reproduction in television. Q15/16 agrees that the issues of colorimetry, sharpening and other transforms can strongly affect the quality of video received by the user and would like to be kept informed of this work in ITU-R WP11A.

Q15/16 contributed toward a liaison statement (TD-79(PLEN)) to be sent to ISO/IEC JTC1/SC29 to encourage compatibility between ITU-T Rec. H.263 and the MPEG-4 video codec under development and toward a liaison statement to be sent to the IMT-2000 project. MISCELLANEOUS Q15/16 wishes to encourage contributions that relate to the study and/or standardization of features for high bit rates. In particular, a sentiment was expressed that interlaced be given more attention. Others commented that for sign language and lip reading applications the needs are unlikely to be adequately fulfilled by operation under such conditions as 10 frames per second and low resolution. Q15/16 expects to soon depart from recent tradition and have Q11/16 typically hold its meetings separately from Q15/16, most likely having the terminal system standardization groups Q11/16 through Q14/16 meeting together, with Q15/16 meeting elsewhere.

Q16/16, HARMONIZATION OF MULTIMEDIA SYSTEMS, APPLICATIONS AND SERVICES The Q16/16 Rapporteur, M. Matsumoto (NTT, Japan), reports directly to the SG16 chair. For this meeting, Q16/16 was combined with Q17/16. See the Q17/16 report below.

Q17/16, AVMMS COORDINATION

The Q17/16 Rapporteur, M. Matsumoto (NTT, Japan), reports directly to the SG16 chair. TD-101(PLEN) provides the meeting report of Q16/16 (Multimedia Harmonization) and Q17/16 (Multimedia Coordination). These questions support the role of SG16 as the lead SG on multimedia. No interim meetings are scheduled. TD-45(PLEN), is the Draft Work Plan for the Multimedia Guideline Document. It was noted that Q16-17/16 might also address standardization of contents creation process for interoperability. It was also noted that the SG2 Question on “content and carriage” discusses content. TD-3(GEN), Future Work in Project M.4: Middleware for Multimedia (SG10 Chair), provides a good overview of the standards oriented work on middleware. It notes two classes of middleware, between networks and storage and between networks and infrastructure services. SG10 asks SG16 if SG16 is interested in becoming the lead SG on M.4. Q16-17/16 asked WP2/16 to determine the extent of SG16 interest in this work. TD-4(GEN), Use of Computer Technology in Television Broadcasting Applications (ITU-R Q249/11), notes that ITU-R Q249/11 will study 10 questions related to the use of computer technology in TV broadcasting (production) applications. This work is planned to be completed in 1999. TD-10(GEN) is a liaison from SG11 WP3/11 Q8/11 regarding IMT-2000 Family Concept and IMT-2000 Phases; it was distributed for information. It includes the an early draft of Recommendation Q.FIN, Framework for IMT- 2000 Networks. TD-48(PLEN) (I. Sebestyen, Q16-17/16 Associate Rapporteur) notes the need to respond to the ISO/IEC MPEG work on multimedia systems and components that need harmonization with SG16. TD-79(PLEN), the return liaison, addresses three topics: • System - the relationship of DMIF to H.323 and H.310 systems is weak. • MPEG-4 audio - only defines decoders; MPEG is developing duplicate tools and codecs. • MPEG-4 video -see Q15/16 report above for this discussion. MULTIMEDIA (MM) HARMONIZATION T. Taylor (Nortel) reported on intended structure of revised H.200. The replacement for Rec. H.200 (General Audiovisual Multimedia infrastructure) was agreed. This list of Recommendations will be useful, however it was felt important to provide explanation of interrelationships between the Recommendations and how the studies will progress in different bodies. T. Taylor (Nortel, Associate Q16-17/16 Rapporteur) will be editor for revised H.200 and its Appendices. Based on the model of multimedia communications systems, it was agreed that T. Taylor will extend the plan of TD-38(PLEN), Draft Framework for Multimedia Standards, using TD-47(PLEN), Liaison to All SGs on Responsibilities for Development of Standards for Multimedia Communications, as the base model. It was

recommended that the new model for multimedia include the work of the ITU-R and ITU-T SG-9, ISO, IETF. The AV series numbering will be dropped. The intent is to Determine Recommendation H.200 in September, 1998. MULTIMEDIA (MM) COORDINATION TD-41(PLEN), Allocation of Work/GII Standardization Projects (JRG on GII), lists all the GII Standardization projects, including those for which SG16 has been identified as a lead or a collaborative body. F. Tosco (CSELT, WP2/16 chair) noted that he will continue as a contact person for project F.4, but is unable to act as project leader. The Project Coordinators for the GII Projects F.3, F.4, I.2 and M.4 were confirmed as follows: GII-Project F.3 (Information Appliances): T. Taylor (Nortel, Canada) GII-Project F.4 (End-to-end Interoperability): M. Matsumoto (NTT, Japan) GII-Project I.2 (Multimedia over IP): J. Magill (Lucent Technologies, UK) GII-Project M.4 (Middleware for Multimedia): M. Blaschitz (INFONOVA, Austria) M. Reid (PictureTel, USA), interim coordinator, prepared a project plan for Project F.3 (TD-91(WP2/16)). T. Taylor, the new Coordinator, will continue the coordination for this project. M. Blaschitz prepared the work plan for project M.4 (TD-94(WP2/16)). M. Blaschitz will continue as coordinator for this project. TD-92(WP2/16) reports on the activity in WP2/16 relevant to projects F.3 and F.4. TD-96(WP2/16) reports on WP2/16 activity relevant to project M.4. Questions 16-17/16 endorsed both these liaisons. F.4 is the “End-to-End Interoperability” project. It was proposed to use third party testing to ensure interoperability. Since Project F.4 provides definitions, it will be difficult to ensure universal applicability of standards. The project should consider existing systems and networks, analyze possible conflicts, and originate solutions. In order to progress the work, the F.4 Group will meet around June 1998 in Japan, if the activities have sufficiently progressed to warrant the meeting. J. Magill (Lucent, UK), the GII I.2 Multimedia over IP project coordinator, noted that the I.2 work is part of the normal SG16 coordination activity. The primary need is to find out what is happening, and to inform others. Each of the GII project coordinators drafted a work plan; each plan was agreed by the meeting as follows: • TD-91(WP2/16): GII Project F.3 • WD-4(Q16.17/16): GII Project F.4 • WD-3(Q16.17/16): GII Project I.2 • TD-94(WP2/16): GII Project M.4 These work plans are attached to TD-101(PLEN) as Annexes A.1 to A.4. Annex B to TD-101(PLEN) lists the active collaborators in this work. MULTIMEDIA (MM) PROMOTION: WORKSHOP ON MULTIMEDIA COMMUNICATIONS As part of its promotional activities, Study Group 16 will hold a workshop on multimedia standardization in April 1999. M. Matsumoto presented a proposal for the terms of reference of this workshop. The draft plan for the workshop was approved at the meeting with some amendment. It was agreed to include project M.4 among the Study Group 16 presentations. Participants are solicited to help with the planning of this workshop. TD-101(PLEN) Annex C gives the plan for the Multimedia Workshop.

Q18/16 WP1 INTERACTION OF HIGH SPEED VOICEBAND DATA SYSTEMS WITH SIGNAL PROCESSING EQUIPMENT IN THE GSTN The Rapporteur is M. Sherif (AT&T, US). SG16 Decided G.511 (ex G.fax-text), Test Methodology for G3 Facsimile Processing in the PSTN, in COM 16-R6. The meeting report is TD-39(WP1/16) (M. Sherif, Q18/16 Rapporteur). COM 16-50© is the Report of the Rapporteur’s Meeting in Amsterdam, NL, 26-27 June 1997. No interim meetings are scheduled.

The two main objectives at the current meeting were to: 1. Re-evaluate the work schedule for the activities during this study period in terms of the progress in H.246 (Interworking of H Series Multimedia Terminals) and the progress in the TIPHON project. 2. Advance the work on Annex B of H.246 (Signaling for Multiple Calls on the PSTN) COM 16-51© (M. Sherif, Q18/16 Rapporteur), Analysis and Examination of the IETF Proposed Algorithm for Compressing the RTP/ UDP/IP Headers (TD-24 WP1/16), was discussed in a joint meeting with experts of Q14/16; it was agreed that Annex B of H.246 will describe how H.323 terminals could interface to the Public Switched Telephone Network (PSTN) through the H.246 gateway with: 1) speech-only terminals; 2) V.70/V.76 Digital SVD (DSVD) terminals; 3) H.324 terminals. The interface to achieve multiple call capabilities will use the interface to V.70/V.76 terminals. Discussions with Q8/16 focused on the use of V.70/V.76 with the suspend/resume mechanism. COM 16-52© (M. Sherif, Q18/16 Rapporteur), a comparison of two different techniques (V.76 suspend resume and subrate multiplexing) for multiplexing voice and data traffic over low-speed point-to-point links, was presented. Q8/16 felt that the optional suspend/ resume mechanism (Annex A/V.76) has not been implemented in DSVD modems, and it was too early to say whether suspend/resume as proposed in COM 16-52© (M. Sherif, Q18/16 Rapporteur) could enhance the performance of DSVD terminals significantly. However, it was suggested that the multiplexing of voice and data on the PSTN should also support the work done in Q4/15 on xDSL. TD-40(WP1/15), a liaison statement to SG15 on this subject, was prepared by the Q18/16 Rapporteur. TD-5(WP1/16) and TD-6(WP1/16) are liaisons from Q9/11 noting that Q9/11 is proceeding to add echo control logic and information flows to Q.115 for broadband networks using source information in draft G.176 and I.atmv. This work may make possible the provision of an echo control function in cell/packet based networks for voice transfer. FUTURE OF Q18/16 Noting the lack of attendance in the meetings specific to Q18/16, the Q18/16 Rapporteur suggested that SG16 consider the possible transfer of Q18/16 to SG15 where the network expertise lies, or the redrafting of the Question to reflect the current priorities in SG16.

Q19/16 WP3, EXTENSION TO EXISTING ITU-T S PEECH CODING STANDARDS AT BIT RATES BELOW 16 KBIT/S The Rapporteur is S. Hayashi (NTT, Japan). The Q19/16 meeting report is TD-44(WP3/16). No interim meeting is planned. VOICE BAND DATA CAPABILITY FOR THE 40-KBIT/S EXTENSION OF G.728 At the Q19/16 meeting in September 1997, the characterization test methodology of the VBD capability of the 40- kbit/s extension of G.728 (Annex J) was almost fully agreed except for a few options such as the testing approach: whether G.720 (worst case testing) or V.56bis (modem block error ratio) should be adopted. A correspondence group was formed to finalize the test methodology. The characterization test methodology was agreed in the correspondence group; TD-19(WP3/19) (S. Hayashi, Q19/16 Rapporteur) presents the complete test plan (Version 3.1). Tests will be performed in the continuous carrier mode for the complete set of test conditions and in character mode for a selected number of conditions. Reference codecs will be G.726 at 40 kbit/s (mandatory) and G.711 (optional). A modified V.56bis approach will be used for testing. Q19/16 approved this test methodology without any change. TD-88(PLEN) includes the liaison to SG 12 thanking them, especially DT/Berkom which volunteered as the host laboratory, and FUB and NTT which volunteered as test laboratories to characterize the higher bit-rate extension to G.728 mainly for DCME. Following the test results, the candidate will be ready for “Determination” if it passes the remaining VBD capability tests. G.729 ANNEX C (FLOATING POINT) TD-44(PLEN) is a proposal for the disclosure policy of normative C-code in ITU-T SG16 recommendations from WP3. TD-95(PLEN) is in response to questions raised at the Plenary by I. Sebestyen, Siemens, Germany, about how the C-code that is part of a Recommendation is distributed and used for evaluation. The concerns raised relate to the use of a software request letter to distribute C-code for evaluation and also to the problems when the distributed C-code contains within it copyright statements from other organizations. TD-95(PLEN) provides a list of the 42 Vol. 9.2 Copyright © CSR 1998 March 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS software files provided and makes editorial changes to the text part of Annex C (COM 16-45©). TD-105(PLEN) provides a copy of the software request letter used and also provides a revised draft statement of the policy of SG16. Some corrections were made to this draft during the plenary. P-B Probst as Chair of SG16 agreed to review these issues further within the ITU. With the editorial changes in TD-95(PLEN) and the agreement to remove the more significant copyright statements from the C-code for evaluation, Annex C of G.729 (Floating Point) was Decided. Germany did, however, reserve the right to review the software for an additional 4 weeks. TEST VECTORS FOR G.729 ANNEX C (FLOATING POINT) Floating-point implementations may generate differences in the output bit streams of the coders and output waveforms of the decoders from an input signal depending upon the platform. Because of this, test vectors are necessary for correct implementation, even though the C-code is provided. AT&T Labs presented the results of experiments showing how the coder output bits are identical and decoder output signals are close in Signal to Noise Ratio (SNR) for double and single-precision implementations with the fixed-point test vector input. WD-1(Q19/16) reports 10 instances of machine dependent problems in the floating point version of C-code for Annex A to G.729. These problems were fixed and the C-code of Annex C (floating point version) to G.729 will be cleaned up before it is handed over to the TSB. This cleaned-up C-code will be delivered as well by the Q19/16 Rapporteur to the recipients of the code during the period from Determination to Decision of this Annex. These results proved the necessity of the test vectors and showed that further testing is needed to ascertain whether the double precision versions always produce bitstreams that are identical to the PC computer double precision version. CORRIGENDUM AND IMPLEMENTOR’S GUIDE FOR ANNEX B (SILENCE COMPRESSION) TO G.729 AND G.723.1 SG16 approved a Corrigendum (COM 16-R20) to the C-code for Annex B of G.729. These changes improve the performance of voice activity detection and the comfort noise algorithm with low-level input signals without compromising the interoperability of the current standard. At the Q19/16 meeting in September 1997, a proposal that fixes the algorithmic and testing problems under frame- erasure conditions in Annex B to G.729 was studied and approved. It was reported that there was an error in Table 5 in G.723.1 (6.3 kbit/s coder). Q19/16 agreed that this maintenance information should be available in an Implementor’s Guide. The proposed text for the Implementor’s Guide is presented in TD-30(WP3/16) (S. Hayashi, Q19/16 Rapporteur). It was also agreed that the full set of the C-code including the correction for Annex B to G.729 will be uploaded to the ITU-T ftp site: ftp://username:[email protected]/u/tsg16/sg16/wp3/q19/729abv13.zip, 729bv13.zip, and 729tv13.zip (for valid ITU-T account holders). EXTENSION OF G.728 - ROBUST AGAINST FRAME ERASURES Annex I to G.728 was an extension of the Low Delay Code Excited Linear Prediction (LD-CELP) codec that modified the decoder algorithm to be operated under burst error conditions of mobile radio channels. This extension, however, was suspended because some quality loss was found in the subjective tests performed with Japanese sentences. TD-31(WP3/16) (S. Hayashi, Q19/16 Rapporteur) contains terms of reference for the LD-CELP extension robust against frame-erasure conditions for FPLMTS/PCME applications. D.107(WP3/16) (R. Cox, AT&T) presents an improved frame-erasure concealment algorithm that intends to overcome the quality loss in the previous proposal. Q19/16 recognized that this algorithm is valuable not only at 16 kbit/s but also at 12.8 and 9.6 kbit/s under variable-rate operation. Because of this, the Terms of Reference of Annex I to G.728 were reviewed and revised, and attached as Annex C to TD-44(WP3/16). The test methodology for this extension was drafted. Before going into the formal subjective testing, NTT will perform preliminary listening tests using PC executable from AT&T with problem-incurring speech sentences. The characterizing test methodology was drafted and reviewed. This methodology will test the Coder mainly under frame-erasure conditions. Other conditions will be tested for reference and to provide a proper framework for the whole test set. This methodology is found in Annex D to TD-44(WP3/16) and will be reviewed and authorized by SQEG/12. TD-88(PLEN) includes the liaison to SG 12. PROPOSAL TO IMPROVE VAD FOR G.729 A new Voice Activity Detector (VAD) algorithm was previously proposed (Sept. 1997 Bethesda, MD CSR Vol. 8.8) based on “fuzzy” logic to improve performance of Annex B to G.729 (D.118, CSELT, Italy). Performance

evaluation with both subjective and objective measures was performed and presented (D.119, CSELT, Italy). Performance of the fuzzy VAD was significantly improved except in the case of noise interpreted as voice due to the VAD flag remaining active. Q19/16 regarded these contributions as “for information.” EXTENSION OF G.729 AT HIGHER BIT RATE The test methodology was drafted and approved for characterizing the Annexes for extensions of G.729 at higher and lower bit rates. TD-27(WP3/16) (S. Hayashi, Q19/16 Rapporteur) presents the draft text of proposed Annex E to Recommendation G.729 - 11.8-kbit/s CS-ACELP speech coding algorithm, which is the higher bit-rate extension designed to accommodate a wide range of input signals such as speech with various background noise and even music. This coder was developed by France Telecom/CNET and University of Sherbrooke and was submitted to Q19/16 in September 1997. The performance of the coder was extensively tested and was found to meet all the Requirements. Q19/6 agreed that this coder should be accepted as the candidate for the higher bit-rate extension of Recommendation G.729. Annex E to Rec. G.729 was Determined at this SG16 meeting as TD-27(WP3/16). TD-21(WP3/16) (P. Usai, CSELT, Rapporteur Q22/12) presents the subjective qualification test plan (experiments 1, 2 & 3) for higher bit rate than the 8 kbit/s extension to the G.729 speech codec. EXTENSION OF G.729 AT LOWER BIT RATE After the Q19/16 meeting in September 1997, Ericsson and NTT formed an optimization group to improve their earlier candidate submissions. They established a baseline coder by 17 November 1997, C-code of which became available under NDA (Non-Disclosure Agreement) control. Mitsubishi and Rockwell proposed their algorithms to improve speech quality particularly under background-noise conditions. Subjective tests were performed, using a partially floating point simulation, by the members of the optimization group. The optimized Ericsson and NTT coder with additional modifications proposed by Rockwell was presented at the February 1998 Q19/16 meeting. TD-02(WP3/16) (S. Hayashi, Q19/16 Rapporteur) is the draft text of the high level description for this optimized 6.4 kbit/s extension to G.729. This algorithm was Determined at this SG16 meeting. Q19/16 appreciates the substantial contribution to this work by following organizations: Ericsson, Mitsubishi, NTT, and Rockwell. Q19/16 also thanks France Telecom for volunteering in editing the draft text. TD-20(WP3/16) (P. Usai, CSELT) discusses the subjective qualification test plan for lower bit rate extension to the G.729 speech codec experiments 1 and 2. TD-28(WP3/16) (S. Hayashi, Q19/16 Rapporteur) is a detailed report on the activities of optimizing the proposed algorithm for the lower-bit rate extension to G.729 after the experts meeting in Bethesda in September 1997. It includes summaries of test results. In TD-88(PLEN), SG16 asks SG12 SQEG to review and finalize the draft characterization test plan for both higher and lower bit-rate extensions to G.729.

Q20/16 WP3, AUDIO AND WIDEBAND CODING IN PUBLIC TELECOMMUNICATION NETWORKS The Rapporteur is R. De Iacovo (CSELT, Italy). The meeting report is TD-43(WP3/16). Current objectives are the review of the qualification test results as first step in the standardization process and finalization of the items to be determined in the Terms of Reference for wideband coding. No interim meetings were requested. TD- 01(WP3/16) contains the report of the Interim Meeting in Bethesda, MD, September 2-5, 1997. It includes the modifications introduced in the ToR. QUALIFICATION TEST RESULTS Four candidate proponents presented candidates for wideband coding: • Canada D.093 • PictureTel D.105 • NTT D.126 • DT-FT/CNET D.129 The summary of the qualification test results is shown in Annex Q20.A of TD-43(WP3/16). DT-FT/CNET also submitted D.130, for information only, the subjective performance of a wideband CELP algorithm working at 16 and 24 kbit/s (test results are reported in the last row in Annex Q20-A). D.128 is the Declaration of Intellectual Property Rights from Deutsche Telekom and France Telecom/CNET. 44 Vol. 9.2 Copyright © CSR 1998 March 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS

NTT reported some problems in D.126. However, as the corrections introduce slight modifications in the MOS (Mean Opinion Score) values shown in the tables, they have no influence on the conclusion reported in D.l26 as regards the subjective test results. On the basis of the qualification test results and the willingness of the candidate proponents to continue the effort and enter into the selection phase, two candidate algorithms, Canada and PictureTel, were accepted for subsequent testing (Selection Phase). Unfortunately, the candidate algorithm from Canada was withdrawn in a later stage and only the PictureTel candidate remained for the Selection/ Characterization Phase. Decision is targeted for April, 1999. The IPR statement for the PictureTel candidate was given to the Rapporteur and to the TSB. The candidate proponent was also made aware of the fact that SG12 informed SG16 of the limited availability of resources to host and conduct subjective tests; some funding for the listening laboratories may become necessary. The candidate proponent accepted to share the costs for the appropriate selection/ characterization listening tests. D.104 is an overview of the PictureTel Transform Codec (PTC). It notes that a fixed point implementation on a TMS320C50 uses 13.9 MIPS and 3681 16 bit words of RAM. FUTURE WORK Based on an observation contained in par. 4.4, (Discussion of test results) of D.93 from Canada (University of Sherbrooke), it was agreed to insert a note in the Terms of Reference asking for more appropriate verification procedure for the sensitivity to input level variation. The revised (changes to Note 8 only) Terms of Reference and associated time schedule are available in Annex Q20.B to TD-43(WP3/16). The time schedule was revised according to the next planned SG16 meetings, and the following items were specifically agreed: 1) The candidate proponents will process and upload to the ITU-T SG16 informal FTP area a limited amount of test conditions, upon request. 2) The Rapporteur will inform the experts group, via e-mail, on the beginning and on the end of the software host laboratory sessions, listening sessions and when the test results are available, as planned in the time schedule. 3) If at the SG16 meeting in September 1998 the Selection/Characterization Phase is stopped without a selected candidate algorithm, it is anticipated, for the benefit of all the organizations involved in wideband coding activities, that the time schedule will be revised and T0 will be likely postponed to a Rapporteur’s meeting in December 1998. 4) The candidate proponent agreed to perform the fixed-point software host laboratory processings. As done in the previous wideband selection test, the candidate proponent will process the candidate conditions, and the listening laboratories will provide pre-processing of the source material and processing of reference conditions utilizing the ITU-T Software Tools Library. Five organizations (AT&T, CSELT, Lucent, FT/CNET and COMSAT) agreed to perform spot checking of the processing done at the proponent laboratory. The spot checking will be started after the end of the host laboratory sessions, during the week from May 18 to May 25. 5) The detailed descriptions of the candidate algorithms will be submitted as White Contributions for the next SG16 meeting in September 1998. 6) The C-source code for the selected algorithm will be made available as early as possible after the Determination, but not later then four months before the scheduled Decision of the Recommendation. The definition of the objective measure to test the codec robustness in random bit errors condition remains to be determined for wideband coding; contributions are requested on the subject. A liaison statement was drafted to inform SQEG/SG12 about the updated Terms of Reference and time schedule for ITU-T wideband coding and to ask support in developing an appropriate selection/characterization test plan. It is requested to have the selection test plan ready by the end of March 1998 and the global test results available to the Rapporteur by the end of July 1998.

Q21/16 WP3, ENCODING OF SPEECH SIGNALS AT BIT RATES AROUND 4 KBIT/S The Q21/16 rapporteur is P. Barrett (BT, UK). The meeting report is TD-35(WP3/16). The objective of this question is to select an algorithm(s) which is likely to meet the terms of reference for the future ITU-T 4-kbit/s speech coding standard (G.4k). Candidate proposals are assessed on the basis of subjective test results produced according to the published 4-kbit/s qualification test plan. TD-5(WP3/16) is a report of the interim rapporteurs meeting in September 1997. Q21/16 reviewed qualification results from six organizations. However, none of the proposals fully met the requirements necessary to enter the selection phase; the next Study Group 16 meeting was set as the new deadline for candidate submissions. In the revised schedule, the target for Decision of G.4k is March 2000. The terms of reference (ToR) for speech coding at 4-kbit/s remain unchanged. Q22/12 (Speech Quality Experts Group) will be asked to review the test methodology for Experiment 2 in the qualification test plan (performance under background noise). CANDIDATE PROPOSALS Candidate proposals were presented by Matsushita, Mitsubishi, NTT, Samsung, Toshiba and Voxware. A high level algorithm description was also presented by COMSAT in D.131. The COMSAT algorithm is a harmonic excitation linear predictive speech coder with a complexity estimate of 60 MIPS. INTELLECTUAL PROPERTY D.95 is the Samsung intellectual property statement for their 4-kbit/s candidate codec. It indicates that they are willing to license as per ITU § 2.1 (waives rights) or 2.2 (on reasonable and non-discriminatory terms); they have not yet determined which. D.137 is the Voxware intellectual property statement for their 4 kbit/s candidate codec indicating that they are will to license on reasonable and non-discriminatory terms. APPLICATIONS AND SCHEDULE Q21/16 reviewed the qualification results with respect to the primary and secondary applications defined in the ToR for 4-kbit/s speech coding. The consensus of the meeting was that many 4-kbit/s applications demand the high quality reflected in the requirements and objectives of the ToR. Given that none of the candidates passed all of the requirements, the meeting therefore agreed to postpone the deadline for candidate submissions until the next Study Group 16 meeting in September 1998. All seven organizations indicated that they intended to submit candidate algorithms at the next meeting. The schedule was revised such that the new target date for Decision of the ITU-T 4-kbit/s speech coding recommendation (G.4k) is March 2000. The revised schedule is Annex Q21.C of TD-35(WP3/16). REVIEW OF TERMS OF REFERENCE AND QUALIFICATION TEST PLAN Despite a request from the Rapporteur for contributions on bit error performance and delay, there were no contributions to the ToR. Matsushita noted that, in their tests, the proposed requirement for random bit errors (G.729 at a BER of 0.1%) gave better performance than G.726, and suggested that this was therefore an unrealistic requirement. The performance requirements for random bit errors and bursty detected frame erasures remain for further study. A number of delegates suggested that increasing the delay requirement by 5 or 10 ms would increase the scope for alternative speech coding technologies. However, a similar number of delegates felt that the current requirement (55 ms) was at the limit of acceptability for some applications. In the absence of any written contributions, the ToR were not modified. The Primary Applications identified in the ToR are: • Very low-rate PSTN visual telephony • Personal communications • Simultaneous voice and data systems • Mobile-telephony satellite systems Speech quality is to be similar to G.726 at 32 kbit/s. The complete ToR is in Annex Q21.B of TD-35(WP3/16). The subjective qualification test plan for the ITU-T 4 kbit/s speech coding algorithm generated by SQEG/12 is in TD-13(WP3/16). After a discussion on the relative merits of CCR (Comparison Category Rating) and DCR (Degradation Category Rating) testing for background noise conditions (Experiment 2 in the Qualification Test 46 Vol. 9.2 Copyright © CSR 1998 March 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS

Plan), it was agreed that a liaison statement will be sent to SQEG/12 requesting them to review the test methodology for this experiment (TD-38(WP3/16) is this liaison). However, it will be noted that there were more Q21/16 delegates in a favor of retaining CCR testing than those in favor of changing to DCR testing. In all other respects, the 4-kbit/s Qualification Test Plan is expected to remain unchanged. It is anticipated that if the qualification test plan were revised, the updated version would be available within approximately six weeks of the next SG12 meeting, which is scheduled for 17-27 February, 1998. OTHER BUSINESS In November, the Chairman of WP3/16 wrote to I. Doig, the Technical Editor for ETSI/SMG, asking for permission for the ITU-T to use the arithmetic operations and associated complexity evaluation procedure defined for the GSM speech codecs. The Rapporteur stated that he had received a reply from I. Doig, who indicated that he did not see any problems with the ITU-T adopting these procedures. TD-34(WP3/16) is the current ETSI complexity evaluation procedure. TD-04(WP3/16)© (ITU-R SG 8) is a draft new Recommendation, Digitally Coded Speech in the Land Mobile Service. It provides the parameters of all the codecs used in land mobile services that have been presented to ITU-R. LIAISON STATEMENTS TD-19(GEN) is a liaison statement to ITU-R TG 8/1 to inform them of the revised 4-kbit/s schedule and terms of reference. TG 8/1 were also asked for information on testing bursty bit errors and frame erasures. The summaries of 4-kbit/s codec qualification results are found in Tables 5-8.

Q22/16 WP3, SOFTWARE AND HARDWARE TOOLS FOR STANDARDIZATION OF SPEECH AND AUDIO CODING ALGORITHMS The Q22/16 Rapporteur is S. F. Campos Neto (Comsat, US). The meeting report is TD-40(WP3/16). Q22/16 deals with the maintenance and future enhancements of the STL96 (Software Tool Library Release 1996). No interim meetings are planned. PROGRESS ON HARDWARE TOOLS No activities were held on hardware tools. Because, under current SG16 practice, software host laboratories are sufficient for most of the standardizations activities, removal of this work item from future meeting agendas and the possible deletion of the hardware tools work items from the text of the question for the next Study Period is being considered. PROGRESS ON SOFTWARE TOOLS The Software Tool Library Release 1996 (STL96) package includes the C code, makefiles, and the STL96 User’s Manual. This package is available for download from the ITU On-line Service or for purchase by mail or fax. However, the STL96 is not yet available for

Proponent High Level Algorithm Frame- Look- Total Description size/ms ahead/ delay/ms ms Matsushita D.133 Multi Dispersed Pulse-CELP 20 15 55 Mitsubishi D.102 Pitch Position Synchronized-CELP 20 8.75 48.75 (note 1) NTT D.127 Pitch Synchronous Innovation-CELP 20 5 45 Samsung D.094 Spectrally Mixed eXcitation (SMX) 20 15 55 Toshiba D.140 CELP/m-band noise coder 20 10.5 50.5 Voxware D.135 Multi-mode Harmonic 20 15 55 Note 1: 5 ms in encoder; 3.75 ms in decoder Table 5. Codec Overview.

Proponent MIPS ROM/kword RAM/kword Matsushita 48 5 (note 1) 3.5 Mitsubishi 60-65 21 (note 2) 4 NTT 40 100 (note 3) 30 Samsung 45 30 (note 3) 4 Toshiba 32 8.5 (note 2) 8 Voxware 25 25 (note 3) 2.5 Note 1: Table ROM only (program ROM estimated at 15-20 kwords) Note 2: Table ROM only Note 3: Combined program and table ROM Table 6. Codec Complexity.

Proponent Clean -16 dBov -36 dBov FER 3% Matsushita - - pass - Mitsubishi pass pass pass - NTT pass pass pass - Samsung - - - pass Toshiba - - pass - Voxware pass pass pass pass Table 7. Qualification Requirements Achieved.

Proponent Tandem Babble noise Vehicle noise Int. Talker Int. Talker 1 tandem 2 tandem Matsushita pass - - - - Mitsubishi pass pass - - - NTT pass - - - - Samsung pass pass pass pass pass Toshiba pass - - - - Voxware pass - - pass - Table 8. Qualification Requirements Achieved Continued. purchase using the ITU On-line On-demand service, dubbed “ITU Bookshop.” This option should be available soon. Note: The C code and test vectors for the other recommendations, e.g., G.729, G.723.1, etc., are also not available for purchase through the ITU Bookshop. Thirteen bugs were identified which apply to the STL96. They are described in detail in TD-40(WP3/16). The significant modifications, i.e., the new G.727 module, the modified EID (error insertion device), FIR (finite impulse response), G.726, and UTL (utility) modules, and the updated tools in the unsupported directory (unsup) are available for ITU members as the Evolving Software Tool Library release 9801 (eSTL9801). This release is an incremental update to be installed on top of the modules available in the STL96, and is available on demand from the Rapporteur. Collaborators are encouraged to test the tools in their environments and to report any problems to the group. REPORTED PROBLEMS IN STL96 The following problems were reported, which required consideration by Q22/16. Prof. P. Kabal (McGill University, Canada) reported a problem with the binary interpolation function in the P.56 module, which is used to determine the active speech level after the activity counts are computed for a signal. He also mentioned a small bug in the demo program sv56demo.c, which does not process the last samples in a file when the file length is not a multiple of the specified frame size. Additionally, he suggested two improvements to the P.56 module: • Postpone active level calculation until all the samples in the file have been processed (e.g. by splitting the activity count operation from the active level determination). This change can potentially increase the speed of the speech voltmeter module. • Use a direct calculation of the active level, instead of binary interpolation. P. Kabal noted that copy of a working paper is available (to ITU account holders at ftp://[email protected]/u/tsg16/sg16/wp3/q22/spechact.ps or .pdf.)

which analyses in detail the algorithm in Rec. P.56, and arrives at a closed-form solution for the active level calculation. This indirectly solves the bug mentioned before. C code was provided with implements the direct calculation. Q22/16 decided to accept in principle the proposed modifications, should they show that no significantly different measurement results are obtained. Still regarding the P.56 module, M. Perkins and D. Ramsden (AT&T, USA) reported a potential problem with the sv56demo.c tools, which applies to both narrow- and wideband speech. Rec. P.56 recommends that the input speech needs to be limited in bandwidth. In particular for narrowband speech, a 300-3400 Hz bandpass filter has to be used, which is not implemented in sv56demo.c. This is not a problem for IRS (Intermediate Reference System) and modified-IRS speech, but level determination may be affected for flat (unweighted) speech. The wideband signals question is unresolved. Q22/16 felt strongly that the current mode of operation of the speech voltmeter should, for consistency, continue to be without any filtering. Filtering options should be added as command line options when the appropriate filters are identified and implemented. Filters already available in the STL should be considered. It was highlighted that the filtering process should apply only to the measurement process, and not to the re-equalization that the sv56demo.c program does. M. J. Kirk (Motorola, USA) reported what he thinks it is a bug in the G.711 compression functions (both A- and µ- law). Currently, negative linear samples are converted to positive samples using one’s complement, and M. Kirk suggests that two’s complement should be used. Q22/16 mentioned that there are two possible ways to implement G.711, and this is exactly the difference: one’s or two’s complement. Q22/16 was unsure on which way is the most correct, and the experts agreed that the issue should be verified further. SOFTWARE PREVIOUSLY SUBMITTED NOT YET AVAILABLE In the May 1996 SG 15 meeting report, it was noted that PTT Ukraine submitted by email a signal generation program, planned to be incorporated in the next release of the STL after adaptation to the UGST (User’s Group on Software Tools, i.e., Q22/16) style and verification of proper operation and portability. Currently, this work still has to be performed. The C code provided by Question 13/12 implementing the P.861 PSQM (Perceptual Subjective Quality Measure) objective quality measure algorithm for low bitrate telephony speech coders falls in the same category as the software mentioned above. This software has been adapted to the STL interface by R. Kirchherr (DT/Berkom) and was submitted to the Rapporteur on January 22, 1998. This adapted software now needs to be verified for portability. Some observations on the C code derived in the conversion process were discussed briefly during the meeting, and it was agreed that those comments should be conveyed to SG12 in a Liaison Statement. FUTURE TOOLS The group discussed the need for a comprehensive investigation of the use of basic operators, and the group agreed that those should be added to the STL. P. Barrett (BT, UK, Q21/16 Rapporteur) agreed to coordinate the work in conjunction with the Q21/16 work. Additionally, the group discussed two possible approaches for a signal processing framework tool: (a) As a script-generation program (b) As a function-calling program In a previous exercise in ETSI, approach (b) above was followed. Both approaches have advantages and disadvantages. The major disadvantages to approach (a) is that one needs to know the system where you are going to do the processings (UNIX, DOS, VMS, ...) and which type of scripting you are going to use (DOS batch, VMS DCL, one of the UNIX shells, etc.). The advantage is that the user does not need to have access to either the source or code of a given codec, just an executable version for a target platform, and the syntax on how to correctly use that program. Another advantage comes from the fact that non-disclosure agreements (NDAs) may not be necessary. For approach (b), the advantage is that, once a portable C code is written for the framework, chances are that the framework tool will work on most operating systems, without special considerations on a particular scripting lan-

guage. A disadvantage of this approach is that adding a new codec would require access to the C code, or to the object code generated for that particular system. Additionally, the system would need to provide all the memory necessary to run the framework tool, which would be a huge program incorporating all STL functionality (codecs, filters, etc.). This would certainly be a problem for MS-DOS applications, unless one can use a run-time library loading strategy (e.g., Microsoft DLL or overlay files). Whichever approach is chosen, however, the common denominator is a flexible syntax that would translate the test plan into instructions for the processing framework, which, in its turn, would parse these instructions either as (a) a script, or (b) as a sequence of processings. The group considered that, for the general type of processing that ITU-T test plans require, alternative (a) is more adequate, and should be pursued. The group also agreed to continue via e-mail the discussion on a flexible syntax. LIAISON STATEMENTS Q22/16 prepared a liaison statement to Q13/12 on the PSQM (P.861) software, and on speech voltmeter aspects (P.56) related to software tools (TD-42(WP3/16)). This requests the assistance of Q13/12 to solve the problems reported above. TD-42(WP3/16) also requests that Q14/12 comment on the appropriate mask for wideband measurements (in particular, the low frequency cut-off point) using the P.56 speech voltmeter, and also on the use of filtering only for the measurement process (and not in the level equalization process).

Q23/16 WP1, A COMPATIBLE PAIR OF HIGH SPEED MODEMS, ONE DIGITAL, THE OTHER ANALOG, FOR USE TOGETHER ON THE PSTN (PCM MODEM) The Q23/16 PCM modem report is in TD-92(PLEN), the WP1/16 report. L. Brown (Motorola, ISG) is the Rapporteur. TD-15(WP1/16) is the report of the Orlando, Florida, Q23/16 Rapporteur meeting. TD- 11(WP1/16) (J. Moughton, Q5/16 Rapporteur), a joint liaison from Q4/16, Q5/16, Q9/16 and 23/16 to SG11 concerning corrections and additions to Q.931, was approved. Two interim meetings were requested (co-located with Q4/16 and Q10/16, see the CSR calendar). TD-16(WP1/16) (L. Brown, Q23/16 Rapporteur) is the updated list of agreements for the V.pcm Recommendations from the Orlando, Florida, Q23/16 Rapporteur meeting. TD-17(WP1/16) (R. Williams, 3Com) is the baseline text for V.pcm - Issue 1, from the Orlando, Florida meeting. TD-16(WP1/16) contains the remaining open issues for V.pcm - Issue 1, as of the beginning of the SG16 meeting. Several other issues were identified during the review process. D.113 (B. O’Mahony, Intel), D.114 (S. Olafsson, Rockwell) and D.139 (3Com) all discuss power calculation and mapping order for V.pcm - Issue 1. There was no consensus to change the previously agreed mapping order, so the mapping order remains unchanged. TD-30(WP1/16) (R. Williams, 3Com) contains the approved text to resolve the power calculation issue. Q23/16 approved the proposed clarifications to V.pcm - Issue 1 contained in TD-18(WP1/16) (L. Brown, Q23/16 Rapporteur). Q23/16 also approved with edits the proposed text in D.123 (Ministry of Communications, Israel) to support the optional use of V.8bis with V.pcm. All of the major open issues concerning V.pcm - Issue 1 were resolved. During the review process, an interim draft was produced, contained in TD-32(WP1/16) (R. Williams, 3Com). After additional review TD-70(PLEN) (R. Williams) was produced which contains the final draft text for V.pcm - Issue 1, as Determined by SG16. The following open issues, to be resolved before submission of the White document, were identified: • Phase 3/4 overall timeout • V.8bis/V.pcm interworking Additionally, it is intended to draft an informative Appendix on network configurations, for approval by SG16 in September 1998. On behalf of Q10/16, Q23/16 discussed D.108 (J. Houdard, Texas Instruments), a proposed provisional international network transmission model for evaluating PCM modem performance. Contributions were solicited. The Q23/16 Rapporteur reviewed the current list of patent holders and asked if any further statements would be forthcoming. No further patent holders were identified. 50 Vol. 9.2 Copyright © CSR 1998 March 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS

WORK PLAN Decision on V.pcm - Issue 1 is expected in September 1998; then work on V.pcm - Issue 2 will begin.

SG16 MEETING ROSTER, JANUARY 26 – FEBRUARY 6, 1998, GENEVA, SWITZERLAND

P. A. Probst, Switzerland SG16 Chair G. Helder, USA SG 16 Vicechair J. Magill, UK SG 16 Vicechair, WP1/16 Chair F. Tosco, Italy SG 16 Vicechair, WP2/16 Chair S.F. Campos Neto, USA WP3/16 Chair Austria I. Sebestyen Post & Telekom Austria M. Blaschitz Detsche Telekom R.-R. Damm Post & Telekom Austria K. Sambor Detsche Telekom S. Rausch Belgium Detsche Telekom H.-D. Schulz Alcatel Bell J. Vandenameele Detsche Telekom M. Schumann BELGACOM R. David Detsche Telekom J. Stegmann Telindus Distribution P.-A. Aerts Siemens R. Callaghan Brazil G. Claessen Siemens M. Euchner M. Tschoepke Siemens R. Frenzel Canada C. La Flamme Siemens N. King R. Salami Siemens K. Klaghofer T. Taylor Siemens W. Klasen Nortel R. Rabipour Siemens M. Korpi China Cheng Chan Siemens G. Meyer Gu Hai Siemens R. Storn Jiang Lintao Siemens B. Wimmer Liang Shiping TELES J. Ott Liu Xinyue Greece Song Guowen ITE S. Drakatou Xu Yuntao Hungary Yu Hongbin MATAV Hungarian Telecom T. Szabo Zhang Tiechen Ireland Finland J. Kauppi Lake Datacomms M. Laughlin Helsinki Tlelphone M. Bäckström Israel A. Amir Nokia M. Alkula A. Cohen Nokia A. Heikkinen R. Even Nokia M. Karczewicz G. Kimchi Nokia R. Mickos K. Krechmer Nokia H. Nieminen O. Levin Nokia L. Rantanen S. Sourani Nokia T. Silk Italy R. Flaiani France D. Battu G. Rinaldo J.-P. Blin CSELT F. Beritelli L. Bourgeat CSELT R. Drogo de Iacovo P. Combescure CSELT F. Tosco G. Dupin Italtel R. Guarneri Y. Robin-Champigneul Italtel C. Rosa G. Sebek RAI S. Morello France Telecom J. Boulvin Japan Y. Homma France Telecom I. Haignere M. Matsumoto France Telecom C. Lamblin A. Tsukui France Telecom F. Lelong Canon M. Hosaka France Telecom C. Quinquis Fujitsu Y. Ota France Telecom A. Tadrist Fujitsu K. Sakai Lab. d'ELectronique Philips V. Brun Graphic Comm. Labs. S. Okubo Lab. d'ELectronique Philips Ph. Gatepin KDD S. Sakazawa Lab. d'ELectronique Philips J. Paulin KDD H. Yamada S.A.G.E.M. Ph. Charbonnier Matsushita ElecIndus A. Atsuta Germany R. Rüggeberg Matsushita ElecIndus K. Yoshida

Mitsubishi Electric W. Matsumoto R. Brandt Mitsubishi Electric Y. Naito B. De Grasse Mitsubishi Electric H. Tasaki G. Fereno NEC Y. Aotani C. Grandgent NEC H. Harasaki G. Griffith NEC M. Serizawa G. Kelley NTT S. Hayashi A. Nguyen NTT N. Kobayashi A. Saks NTT K. Mano 3Com F. Lucas NTT T. Morioka 3Com V. Parizhsky NTT S. Sasaki 3Com R. Stuart NTT Y. Sasaki 3Com R. Williams NTT Y. Tomita Analog Devices N. Rao NTT Mobile Comm. Net. T. Kawahara ASCEND Comm. S. Agarwal Oki Electric Industry Y. Aoyagi ASCEND Comm. K. Jones Oki Electric Industry M. Miyazaki ASCEND Comm. D. Skran Toshiba M. Akamine AT&T R. Cox Toshiba K. Miseki AT&T R. Roy Toshiba H. Tanaka AT&T M.H. Sherif Korea Bay Networks S. Jovanovic Korea Telecom Y. Choi Bay Networks M. Mehta Korea Telecom S.G.. Kang Bellcore R. Rubin Korea Telecom H.L. Lee CIRRUS Logic V. Krishnan Samsung Electronics Y.D. Cho CIRRUS Logic R. Simeon Samsung Electronics S.R. Kim Cisco Systems K. Riley Netherlands COMPAQ E. Newman KPN J. De Muijnck COMSAT Corp. S. Campos-Neto KPN C. Quist COMSAT Corp. S.s Yeldener Norway DataBeam P. Galvin Telnor AS J.E. Knudsen DataBeam P. Murphy Telnor AS T. Ulseth Delta Infor. Systems N. Randall Russian Federation I. Movtchan Ess Technology P. Dong Spain E. Berrojalviz General DataCom Y. Goldstein Sweden G. Hellström Hayes B. Adams L.M. Ericsson E. Ekudden IBM A. Sadri L.M. Ericsson R. Hagen IBM G. Ungerboeck L.M. Ericsson M. Nasiri Intel N. Bhasker L.M. Ericsson A. Svennevik Intel V. Kumar Telia L. Bengtsson Intel K. Lillevold Telia A. Kilegran Intel B. O'Mahony Telia B. Lindström Intel J. Toga Switzerland A. Blum Lucent Technologies B. Barazesh P.-A. Probst Lucent Technologies G. Freundlich Swisscom M. Pralong Lucent Technologies S. Ramprashad Swisscom P. Vöorös Lucent Technologies L. Yan Syrian Arab Republic N. Kisrawi MCI Telecom. M. McEntire Thailand S. Tanapirunthorn Microsoft T. Nixon U.K. & Nothern Ireland Motorola Info. Sys. L. Brown W. Pechey Motorola Info. Sys. J. Burnett BT P. Barrett Motorola Info. Sys. Th. S. Chu BT J. Boucher Motorola Info. Sys. W. Schmidt BT P. Cordell Northern Telecom F. Audet BT A. Farquharson PC-TEL H.C. Yeh BT M. Nilsson PictureTel A. Crossman BT J. Pointer PictureTel M. Duckworth GPT N. Winch PictureTel K. Hedayat Hayes J. Moughton PictureTel G. Helder Lucent Technologies P.M. Buckley PictureTel D. Lindbergh Lucent Technologies G. Magill PictureTel M. Schachtman Madge Networks M. Bozier PictureTel G. Sullivan Motorola J. Gibbs Polycom M. Collier Panasonic Stand. Europe A. Pugh Rockwell Int’l T. Geary Racal Datacom Ch. Firth Rockwell Int’l S. Olafsson U.S.A. E. Baskin Rockwell Int’l N. Shapira

Rockwell Int’l N. Tal A. Varnosov Rockwell Int’l J. Thyssen M. Vykhodets Texas Instruments J.-P. Houdard Other Videoserver G. Kajos ETSI D. Gurle Videoserver M. Reid INMARSAT E. Trachtman Vocal Technologies V. Demjanenko INTELSAT C. Amor VOXWARE C. Watkins SITA J. Cabassu VTEL M. Chen SITA S. Fabre Ukraine O. Gofaizen TSB F. Bigi I. Usov UEER/EBU L. Cheveau M. Vakulenko

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

TIA TR-29 Facsimile TR-30 Modems TR-41 User Premises Equipment ITU-T SG 8 Telematic Terminals SG 15 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

THE CSR LIBRARY Subscribers may order copies of documents shown in boldface type from Communications Standards Review, where not controlled. -e means we have electronic copy only; +e means we have electronic and hard copy available. We have a large library of standards work in process and can help you locate other information you may need.

The next issue of Communications Standards Review – Telecommunications (Vol. 9 #3) is scheduled for April 1998.

ACRONYM DEFINITIONS

AAL ATM Adaptive Layer ACELP Algebraic Code Excited Linear Predictor ADSI Analog Display Services Interface (Bellcore) ADSL Asymmetric Digital Subscriber Line AL1 H.223 Adaption Layer 1 ANSI American National Standards Institute ASN Abstract Symbol Notation ATA Analog Terminal and Access Project ATM Asynchronous Transfer Mode ATU-R ADSL Transceiver Unit - Remote Terminal End AVMMS AudioVisual and MultiMedia Services B-HLI Broadband High Layer Information BA Basic Access (ISDN) BER Bit Error Rate BINTERMS Basic Interoperability for Terminals for Telematic Services CD Committee Draft CD-ROM Compact Disk-Read Only Memory CMOS Complimentary Metal Oxide Semiconductor CORBA Common Object Request Broker Architecture CPE Customer Premise Equipment CS-ACELP Conjugate Structure -Algebraic Code Excited Linear Predictor DAVIC Digital Audio-Visual Council DCE Data Circuit Terminating Equipment DCME Digital Circuit Multiplication Equipment DCT Discrete Cosine Transform DIS/IS Draft International Standard DMIF DSM-CC Multimedia Integration Framework DSL Digital Subscriber Line DSM-CC Digital Storage Media - Command and Control DSVD Digital SVD DTE Data Terminal Equipment DTMF Dual Tone Multi Frequency DTS Definitive Telefax Standard DVD Digital Video Disk EMC ElectroMagnetic Compatibility ES ETSI Standard ETR ETSI Technical Reports ETS European Telecommunications Standard (ETSI) ETSI European Telecommunications Standards Institute FDD Frequency Division Duplexing FEXT Far End Cross Talk FPLMTS Future Public Land Mobile Telephone Systems fps frames per second FSK Frequency Shift Keying GCC Generic Conference Control GII Global Information Infrastructure GK GateKeeper GSM Global System for Mobile Communications (formerly Groupe Speciale Mobile) GSTN General Switched Telephone Network (e.g., PSTN) GW GateWay HDSL High-rate Digital Subscriber Loop HSM High Speed Modem IETF Internet Engineering Task Force IP Internet Protocol IPR Intellectual Property Rights ISDN Integrated Services Digital Network JRG Joint Rapporteurs Group MAP Mobile Application Part MCS Multi-point Control Services (T.122) MCU Multi-point Control Unit MHEG Multimedia and Hypermedia Experts Group MIPS Million Instructions Per Second MPEG Moving Picture Experts Group NEXT Near End Cross Talk NSB National Standardization Body PCM Pulse Code Modulation PCME Packet Circuit Multiplication Equipment POTS Plain Old Telephone Service PPP Point-to-Point Protocol 54 Vol. 9.2 Copyright © CSR 1998 March 1998 COMMUNICATIONS STANDARDS REVIEW – TELECOMMUNICATIONS

PSD Power Spectral Density PSK Phase Shift Key PSQM Perceptual Subjective Quality Measure PSTN Public Switched Telephone Network QoS Quality of Service QSIG ISO standard for signalling between two PBXs RAS Registration, Admission, and Status RFC Request for Comments RTCP Real-time Transport Control Protocol RTP Real Time Transport Protocol SDL Specification Description Language SDSL Simultaneous HDSL SG Study Group (ITU, CCITT) SMG Special Mobile Group SNMP Simple Network Management Protocol STL Software Tool Library SVD Simultaneous Voice Data TA Terminal Adapter TBR Technical Basis for Regulation (ETSI standard) TDD Time Division Duplexing TIA Telecommunications Industry Association TIPHON Telecommunications and Internet Protocol Harmonization Over Networks (ETSI Project) TM Transmission and Multiplexing (ETSI Committee) ToR Terms of Reference TR Technical Report TSAG Telecommunication Standardization Advisory Group TSB Telecommunications Standardization Board (ITU) UDP User Datagram Protocol VBD Voice Band Data VBR Variable Bit Rate VC Virtual Channel VDSL Very high speed ADSL xDSL all the different Digital Subscriber Lines

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1998 STANDARDS COMMITTEE MEETING SCHEDULES AS OF MARCH 6, 1998 Subject to Change without Notice

Committee Date(s) Location Q9/16, Q12/16, Q13/16, Jun 9 - 12 Nice, France Q14/16, Q18/16 TR-41 Feb 23 - 27 Albuquerque Rapporteurs ETSI MTA Mar 2 - 6 Berlin or Sophia SG 8 Jun 9 - 18 Geneva, Switzerland Antipolis ETSI TIPHON Jun 15 - 19 Oslo, Norway TR-30 Mar 9 - 12 Dallas, TX TR-30 Jun 15 - 19 Raleigh, NC Q4/16, Q23/16 April USA Rapporteurs Q3/16 Rapporteurs Jun 22 - 26 Colorado, USA Q4/15 Rapporteurs Apr 6 - 9 Chicago, IL ETSI ATA Jun 22 - 26 Sophia Antipolis, France ETSI DTA Apr 7 - 8 Sophia Antipolis, France ETSI TM6 Jun 22 - 26 Lulea, Sweden Q11/16 (Systems Apr 14 - 17 Yokosuka, Japan Aspects), Q12/16, ETSI MTA Jun 29 - Jul 3 Munich, Germany Q13/16, Q14/16 Q4/15, with Q6/16 & Jun 29-Jul 3 Hawaii, USA Rapporteurs Q7/16 Rapporteurs ETSI TM6 Apr 20 - 24 Antwerp, Belgium Q11/16 and Q15/16 Jul 21 - 24 --- Q3/16 Rapporteurs Apr 20-22 West Coast USA Rapporteurs Q4/15 with Q6/16 & Aug 3 - 7 Antwerp, Belgium Q11/16 (Mobile Apr 21 - 24 Tampere, Finland Q7/16 Rapporteurs Aspects) and Q15/16 TR-30 Aug 10 - 14 Quebec City, Que Rapporteurs Q4/16 V.8bis Apr 23 - 24 New Jersey TR-41 Aug 17 - 21 Calgary, Alberta Rapporteurs T1E1 Aug 31-Sep 4 California ETSI TIPHON Apr 27 - 30 Munich, Germany ETSI TIPHON Sep Portland, OR TR-30 Apr 27-May 1 New Jersey SG 16 Sep 14 - 25 Geneva, Switzerland TR-29 May 4 - 7 Atlanta, GA ETSI TM6 Sep 21 - 25 Vienna, Austria TR-41 May 11 - 15 Washington DC SG 15 Oct 12 - 23 Geneva, Switzerland Q4/15 Rapporteurs May 11-14 Nice, France TR-30 Nov 9 - 13 San Antonio, TX Q4/16, Q10/16, Q23/16 Summer Europe Rapporteurs TR-41 Nov 16 - 20 Palm Springs, CA Q1/16 Rapporteurs June France ETSI TM6 Nov 23 - 28 Sophia Antipolis, France T1E1 Jun 1 - 5 Huntsville, AL T1E1 Nov 30-Dec 4 Texas Q11/16 Jun 9 - 12 Nice, France

Committee Date(s) Location

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