ITU - Telecommunications Standardization Sector PCM00 051R1

ITU - Telecommunications Standardization Sector PCM’00-055R1

Study Group 16 - Question 23 ______

Q23 Rapporteur Meeting, Edinburgh, Scotland, June 26 – 30, 2000

SOURCE*: Rapporteur Q23/16

TITLE: Issues List for the ongoing work on PCM modems ______

ABSTRACT

This contribution contains the Issues List for the ongoing work on PCM modems. It includes the agreements that were reached at the June 2000 Q23/16 meeting.

*Les Brown Tel: (905) 507-7361 (office) Motorola ING Tel: (416) 990-4467 (portable) Fax: (905) 507-7236 E-mail: [email protected] 0. Issues List Description

The following describes the various elements of an Issues List:

 The ‘Item Number’ uniquely identifies an issue for quick reference.

 The ‘Status’ of an issue shall be either ‘Open’, ‘Agreed (resolution date)’ or 'Closed (resolution date)'.  An issue may become partially resolved at some point in time. In this case, it shall be split apart. The unresolved part of the issue shall keep the original item number and Open status. The resolved part of the issue shall use the same number with an added numerical suffix (e.g., “9.1”) and shall have the status ‘Agreed (resolution date)’.

 The ‘Item Description’ delineates an issue as follows:  ‘Open’ issues, which generally address what the issue is, shall be formatted as questions. Example: “Should there be provisions to negotiate symmetric operation?”  ‘Agreed (resolution date)’ issues, which generally address how the issue has been resolved, can be categorized as general ‘goals’ or ‘requirements’, or as ‘specific actions’.  Goals shall be identified by using the words ‘that ... should ...’ in the delineation of an issue. Example: “that local flow control should be supported”.  Requirements shall be identified by using the words ‘that ... shall ...’ in the delineation of an issue. Example: “that PCM encoding compliant with G.711 shall be used in the downstream direction”.  Specific actions shall be identified by using the words ‘to adopt ... ’ in the delineation of an issue. These are generally for adopting referenced text Example: “to develop a second PCM modem Recommendation (V.92) encompassing enhancements and further improvements of PCM modem technology”.  'Closed (resolution date)' issues are those that will no longer be considered, either because it has been explicitly agreed to no longer consider them, or because they have been superceded by other agreements and are no longer pertinent.  The ‘Reference(s)’ is a list of meeting contribution numbers that address a particular issue.

2 1. Global Issues

The following Issues List applies in general to the ongoing work on PCM modems.

Item Status Item Description Reference(s) Number

1. General: 1.1 Agreed to develop a second PCM modem Recommendation (V.92) D.377 (4/98) encompassing enhancements and further improvements of PCM modem technology. 1.2 Agreed that as much of the V.90 downstream specification as PCM00-009, D.383 (4/98) practical should be kept in V.92. 1.2.1 Agreed to not open up the downstream technology for V.92 TR-30.1/99-11-064, (01/00) PCM00-014 1.3 Agreed that, as a minimum, support of PCM upstream, call waiting PCM00-052 (11/99) compatibility and quick connect shall be mandatory in V.92. 1.3.1 Agreed that it is mandatory to respond to the modem-on-hold (01/00) procedure, optional to initiate the modem-on-hold procedure 1.4 Agreed that, since low startup time is important for multimedia (4/98) applications, work should progress with the understanding that techniques which allow shorter startup times are preferable to those that require longer startup times.

2. Network topology: 2.1 Agreed that PCM operation shall be supported when a 4-wire (4/98) direct digital network connection is present at one end or both ends of the connection.

3. Modulation: 3.1 Closed that modulation schemes that do not necessarily force TR-30.1/99-11-064 (00/01) constant synchronous data signalling rates shall not be considered in V.92

4. Signal representation: 4.1 Agreed that digital modem transmit signals shall be specified in an (4/98) analog representation for startup Phase 1. 4.2 Agreed that digital modem transmit signals shall be specified as (4/98) PCM code words for startup Phase 3 and beyond.

5. Robbed bit signalling 5.1 Agreed that a mechanism shall be provided to allow robbed bit (4/96) signalling to be detected and its effect mitigated, if present.

3 2. Issues List for the case when the network topology is such that one end is digitally connected

The committee agreed to the goal of determination of V.92 at a WP1/16 meeting, June 2000.

Item Status Item Description Reference(s) Number

0. Operational mode: 0.1 Agreed that the operational mode shall be duplex with channel (4/98) separation by echo cancellation.

1. Modulation: 1.1 Agreed that PCM encoding compliant with G.711 shall be used in (4/98) the downstream direction 1.1.1 Agreed that a linear coding mode shall not be specified in PCM99-005, (01/00) Recommendation V.92, but left for a future TR-30.1/99-10-048, Recommendation (to be added as a work item on the TR-30.1/99-10-049, Question list for the next study period) TR-30.1/99-11-070, PCM00-012 1.2 Agreed that the universal code set description from V.90 shall be (4/98) used 1.3 Agreed that V.92 shall support higher data signalling rates (4/98) upstream than V.90 1.4 Agreed that V.92 shall use PCM in the upstream direction. PCM99-002, (9/99) PCM99-003, PCM99-007, PCM99-016 1.5 Agreed that the upstream symbol rate shall be 8000 locked to PCM99-007 (9/99) network timing. 1.6 Agreed that transmitter pre-equalization shall be used in the PCM99-016, (9/99) upstream direction. PCM00-003, PCM00-018, PCM00-021 1.6.1 Agreed that V.92 upstream shall use the equivalence class PCM99-009, (02/00) definition specified in equation 1 of D.382 TR-30.1/99-11-054, PCM00-003, D.380, D.382 1.6.2 Agreed that the V.92 pre-equalizer shall consist of feedback and PCM00-018, (01/00) feedforward (FIR) filter sections (see Issue 1.6.2.3 for PCM00-021, D.382, more detail) D.469, D.470 1.6.2.1 Closed Should the sequence of these filters be specified? (see PCM00-018, (02/00) Issue 1.6.2.3) PCM00-021, D.382, D.385, D.469 1.6.2.2 Agreed to include a NOTE in V.92 to indicate that “the DPCM PCM00-018, (02/00) modem should design the pre-equalizer filter coefficients PCM00-021, D.376 4 assuming that the APCM modem minimizes power at the precoder output on a symbol by symbol basis”. 1.6.2.3 Agreed that the precoder shall consist of a feedback filter and D.382 (02/00) optionally a feedforward (FIR) filter, and the prefilter shall consist of a feedforward (FIR) filter and optionally a feedback filter. 1.6.2.3.1 Agreed that the first coefficient of each of the pre-equalizer filters (02/00) (except the prefilter feedforward filter) shall be 1.0. 1.6.2.3.2 Agreed that the pre-equalizer filters shall be specified by equation (02/00) rather than by figures 1.6.2.3.3 Agreed that the prefilter numerator coefficients shall be specified (02/00) in signed Q0.15 format, that the coefficients for the other 3 pre-equalizer filters shall be specified in signed Q1.14 format, and that there will be a prefilter gain term specified in unsigned Q10.6 format 1.6.2.4 Agreed that the APCM modem shall indicate support of the D.382 (02/00) optional precoder feedforward filter and optional prefilter feedback filter using 2 bits during startup 1.6.3 Agreed that the APCM modem shall indicate to the DPCM modem (01/00) the limit(s) on the number of coefficients allowed for the pre-equalizer, that the DPCM modem shall then design the pre-equalizer and shall then transfer the coefficients back to the APCM modem. 1.6.3.1 Agreed that V.92 shall specify a minimum number of pre-equalizer (01/00) coefficients that shall be supported (value is still TBD) 1.6.3.2 Agreed that the APCM modem shall indicate to the DPCM modem (02/00) the maximum number of coefficients that it can support for a filter in the precoder/prefilter, along with the maximum number of coefficients that it can support for all 4 filters combined. 1.6.3.3 Agreed that the DPCM modem may decide to specify that the (02/00) precoder feedforward and prefilter feedback filters are of zero length 1.7 Agreed to adopt the frame structure shown in Figure 1 of TR-30.1/99-11-053, (11/99) contribution D.379 D.379 1.8 Agreed that up to 6 different signal constellations may be used in TR-30.1/99-11-053, (11/99) V.92 upstream D.379 1.9 Agreed that V.92 upstream shall use 12 symbol modulus TR-30.1/99-11-053, (01/00) conversion as specified in D.379 D.379 1.10 Agreed that the transmitter structure shown in Figure 1 of D.382 PCM00-003, D.382 (02/00) shall be used for V.92 upstream. 1.11 Agreed that the inverse map defined in D.384 shall be used in PCM00-020, D.384 (02/00) V.92. 1.12 Agreed that V.92 upstream shall use the same scrambler as V.90 (02/00) upstream (V.34 GPA scrambler) 1.13 Agreed that the differential encoding mechanism described in PCM00-043R1 (04/00) PCM00-043R1 shall be used with V.92 upstream during

5 data mode

2. Data signalling rates: 2.1 Agreed that provisions to negotiate symmetric operation shall not PCM00-013 (01/00) be provided in V.92 2.2 Agreed that the rate granularity shall be 1 1/3 kbit/s (9/99) 2.3 Open Should a procedure be specified that optimizes the data PCM99-013, Closed signalling rate in one direction, possibly at the expense of TR-30.1/99-10-039, (06/00) data signalling rate in the other direction (dual rate TR-30.1/99-10-040, coding)? TR-30.1/99-10-041, TR-30.1/99-11-065, PCM00-019, D.467, D.468, D.471 2.3.1 Open Should a digital modem indicate estimated upstream data PCM00-038 Closed signaling rates for three different downstream transmit (06/00) powers? 2.3.2 Agreed that an SUVu frame will not include a bit informing the TR-30.1/00-05-057 (05/00) digital modem whether the upstream power change it is requesting is for correction purposes or for selecting a new nominal power. 2.4 Agreed that the upstream data signaling rate range shall be from (02/00) 24000 to 48000 bit/s.

3. Coding: 3.1 Agreed that V.92 upstream shall use the V.34 trellis codes. PCM99-009, (01/00) PCM00-016, D.381 3.2 Agreed that support of the codes shall be mandatory in the PCM99-009 (04/00) transmitter and optional in the receiver (as in V.34).

4. INFO exchanges: 4.1 Agreed that the digital modem shall indicate during startup in an (4/98) INFO sequence whether it is configured to transmit A-law or µ-law codes. 4.2 Agreed that the use of PCM upstream shall be indicated in Phase 2 PCM99-007, (01/00) INFO bits. PCM00-009, D.383 4.2.1 Agreed that PCM upstream operation shall be decided by mutual (01/00) agreement of the APCM modem and DPCM modem, with the APCM modem making the final selection

5. Transmit power: 5.1 Agreed that the transmit level shall be compliant with National (4/98) regulations. 5.2 Agreed that, during startup, the digital modem shall indicate its (4/98) maximum transmit power (not to exceed the regulatory limit), and the Recommendation shall include text stipulating that the analog modem shall comply with this

6 restriction in its selection of constellations. 5.3 Agreed that the minimum value for the digital modem’s indicated (4/98) maximum transmit power shall be -16 dBm 5.4 Agreed that both the digital and analog PCM modems shall use a (4/98) common method to determine an upper bound on the transmit power. 5.5 Agreed that the action to take if the modems don’t comply with the (4/98) regulations shall not be specified.

6. Startup 6.0.1 Open What additionalto timeouts need to be specified for the Agreed operating procedures? (06/00) 6.1 Phase 1 6.1.1 Agreed provisionally that the support of V.92 shall be indicated in PCM00-009, D.383, (01/00) Phase 1 using the existing V.90 bits (V.8, and optionally PCM00-039 V.8bis). Provisionally agreed to request Q4/16 to change the definition of V.90 bits to include V.92 (i.e., no new bits in Phase 1 for V.92) 6.1.1.1 Agreed to indicate support for V.92 with bit 26 in INFO0 during TR-30.1/00-03-039 (03/00) Phase 2 6.1.1.2 Open Is there a need to reserve a bit in INFO0 for future revision Closed of V.92? 6.1.2 Agreed to specify a mechanism for a V.92 APCM modem to (11/99) escape a V.8bis startup initiated by a V.92 DPCM modem. 6.1.3 Agreed to add text to V.92 stating that: (04/00)  if the LAPM protocol bit(s) is/are set by both modems during Phase 1 (in V.8 or V.8bis), and  the V.92 bit is set by both modems during Phase 2 in INFO0, the V.42 ODP/ADP exchange shall be bypassed. 6.2 Phase 2 6.2.1 Agreed that Phase 2 of full train for V.92 shall use the same (01/00) structure as V.90, with new information bits as necessary 6.2.2 Agreed to the content of INFO1d and INFO1a contained in Tables TR-30.1/00-03-029, (03/00) 1 to 4 of TR-30.1/00-03-029 (excluding bits 40:47 in Table PCM00-031 2, which needs further study) with minor editorial corrections. 6.2.2.1 Agreed that bits 18:24 of INFO1a shall be changed to specify the PCM00-026 (04/00) length of MD in 276 sample (at 8000 sample rate), or 34.5 ms, increments. 6.2.2.2 Agreed that the RMS value for signal v(n) as shown in Figure PCM00-031 (05/00) 2/V.92 (the prefilter output) shall match linear value 4000

7 6.2.3 Open Should a method be defined to allow both client and server TR-30.1/00-05-061 Closed modems to jointly select which modulation will be used? (06/00) 6.3 Phase 3 6.3.1 Agreed that the analogue modem shall transmit first during Phase 3 PCM99-004, (9/99) PCM99-007, PCM00-009, D.383 6.3.2 Agreed that V.92 shall use the same DIL sequence descriptor PCM99-007, (9/99) (conveyed in Ja) as V.90 PCM00-009, D.383 6.3.3 Agreed that the analog modem transmitter shall be locked to PCM00-004 (01/00) network timing starting with the duplex portion of training in Phase 3 6.3.3.1 Agreed that the symbol rate of 8000 shall be used from the PCM00-009, D.370, (02/00) beginning of Phase 3 of the startup procedure D.383 6.3.4 Agreed that Phase 3 of the V.92 startup procedure for the non-zero TR-30.1/00-03-030, (05/00) length DIL case shall use the structure (and signals) shown TR-30.1/00-05-060 in Figure 1 of TR-30.1/00-03-060. 6.3.4.1 Agreed that the signals transmitted by a DPCM modem during TR-30.1/00-03-030 (03/00) Phase 3 full startup, and their durations, shall be as shown in Figure 1 of TR-30.1/00-03-030 (with the correction that TRN1d is 2040T). 6.3.4.1.1 Agreed to the definition of Jd_phase contained in TR-30.1/00-03- TR-30.1/00-03-030, (03/00) 030., modified by proposal in PCM00-054 (with further PCM00-054 (06/00) minor revision) 6.3.4.2 Agreed that APCM modem signal TRN1u shall be a 2 point TR-30.1/00-03-030 (03/00) constellation transmitted at the power to be used during the subsequent data mode. 6.3.4.3 Agreed to keep the optional MD sequence TR-30.1/00-03-030 (03/00) 6.3.4.4 Agreed to the definition of signal Su in TR-30.1/00-03-030 TR-30.1/00-03-030 (03/00) 6.3.4.5 Agreed that CPt shall use a 2 point constellation, the same as TR-30.1/00-03-030 (03/00) TRN1u. 6.3.4.6 Agreed that the duration of signals transmitted by the APCM TR-30.1/00-03-030 (03/00) modem during Phase 3 full startup shall be as shown in Figure 1 of TR-30.1/00-03-030. 6.3.4.7 Agreed to the definition of signal Ru in TR-30.1/00-03-030 TR-30.1/00-03-030, (04/00) PCM00-028 6.3.4.8 Agreed the modulation format for Ja shall be as specified in TR- TR-30.1/00-03-030, (04/00) 30.1/00-03-030. PCM00-029 6.3.4.9 Agreed that Ja shall be a multiple of 12 symbols in length. TR-30.1/00-03-030 (04/00) 6.3.4.10 Agreed that the Ja bits shall be as defined in Table 1 of PCM00- PCM00-029 (04/00) 029, with additional fill bits as necessary to comply with Issue 6.3.4.9. 6.3.5 Agreed that Phase 3 of the V.92 startup procedure for the zero PCM00-030, (05/00) length DIL case shall use the structure and signals shown TR-30.1/00-05-060

8 in Figure 3 of TR-30.1/00-05-060. 6.3.6 Agreed to specify differential encoding (modulo-2 operation on the (05/00) sign bit) for the startup procedure, to be turned on:  for Ja  for CPt until the end of E2u 6.4 Phase 4 6.4.1 Agreed that pre-equalizer coefficients shall be transferred during (01/00) Phase 4 6.4.2 Agreed that constellation sets shall be exchanged during Phase 4 (01/00) 6.4.2.1 Agreed that, in specifying an efficient means for exchanging the TR-30.1/00-03-039 (03/00) constellation sets, no restrictions shall be imposed on the constellations designed by the DPCM. 6.4.2.2 Agreed that the constellations shall be symmetric about zero (04/00) 6.4.2.3 Agreed that no further compression shall be applied to the PCM00-027, (04/00) exchange of constellation sets PCM00-041R1 6.4.3 Agreed that Mi’s for modulus conversion shall be transferred (01/00) during Phase 4 6.4.4 Agreed that there shall be no DIL sequence in the upstream PCM00-004, (04/00) direction PCM00-009, D.383 6.4.5 Agreed that Phase 4 of the startup procedure shall use the structure TR-30.1/00-03-030, (05/00) and signals shown in Figure 2 (for non-zero length DIL TR-30.1/00-05-030 case) and Figure 4 (for the zero length DIL case) of TR- 30.1/00-05-060 (see Issue 8.4.3 for details on CP exchange). 6.4.5.1 Agreed that signal TRN2u shall be scrambled binary ONEs, TR-30.1/00-03-030 (03/00) transmitted on a 4 or 8 point constellation, at the power level to be used during the subsequent data mode. 6.4.5.2 Agreed to the definition of signal B1u contained in TR-30.1/00-03- TR-30.1/00-03-030 (03/00) 030 6.4.5.3 Agreed to the content of Ri, Ri bar, TRN2d and B1d contained in TR-30.1/00-03-030 (03/00) TR-30.1/00-03-030. 6.4.5.4 Agreed that signals Eu and Ed shall be as specified in TR-30.1/00- TR-30.1/00-03-030 (05/00) 03-030 6.4.6 Agreed to adopt the method outlined in TR-30.1/00-03-032 for TR-30.1/00-03-032 (04/00) adjusting the alignment of the data frame to the RBS pattern so as to minimize the coincidence of RBS impairments and trellis coded symbols. 6.4.7 Agreed to use drn=0 in CP to indicate cleardown (05/00) 6.4.8 Agreed that for Phase 3 and 4 error recovery, the modems shall (05/00) always go back to tones in Phase 2 6.4.8.1 Open What error recovery should be specified for Phase 4 protocol errors (e.g., missed SUV frame)?

7. Retrain:

9 7.1 Agreed that a retrain mechanism shall be included. (4/98) 7.2 Agreed that all retrains that do not involve an INFO0 exchange PCM00-026 (04/00) shall use the full Phase 2 procedure (not the shortened Phase 2 – see Issue 11.3). 7.3 Agreed that for retrain error recovery, the modems shall always go (05/00) back to tones in Phase 2

8. Rate renegotiation 8.1 Agreed that a rate change mechanism shall be included. (4/98) 8.2 Open Should seamless rate change be supported? PCM00-013 Closed (06/00) 8.2.1 Agreed that the rate renegotiation mechanism shall be non- TR-30.1/99-10-038 (10/99) corruptive, and that interruptions it caused, if any, would be limited to a very short (as yet undefined) duration 8.3 Agreed that V.92 shall not specify a fast switching mechanism to (02/00) support dual rate coding (see Issue 2.3) 8.4 Agreed that V.92 shall specify both a rate renegotiation procedure TR-30.1/00-03-031, (04/00) and a fast parameter exchange procedure TR-30.1/00-03-033, PCM00-046R1 8.4.1 Agreed to the proposals in section 1 of PCM00-046R1 concerning PCM00-046R1, (04/00) the structure and signals for the first part of the rate TR-30.1/00-05-056 renegotiation and fast parameter exchange procedures, except that:  the APCM modem shall not be structurally forced to send “CP long” (renamed CPu) first  escape signals shall start on a frame boundary 8.4.2 Agreed to the proposals in section 2 of PCM00-046R1 concerning PCM00-046R1, (05/00) information content of “CP long” (renamed CPd for TR-30.1/00-05-056 downstream and CPu for upstream) except for:  Power change from current upstream TX power. It was agreed to indicate in SUVu (see Item 8.6) CORRECTIONS to the upstream transmit power from nominal (measured RMS level at the pre-filter output minus the number 4000) to a maximum of 3.75 dB in .25 dB steps (coded in 5 bits), including a codeword to indicate that this is not a power measurement. 8.4.3 Agreed to a COMMON parameter exchange protocol (for rate PCM00-036, (05/00) renegotiation, fast parameter exchange, full retrain, full PCM00-037, startup, and quick connect) with the following attributes: TR-30.1/00-05-056  consists of “SUV” and “CP” frames  acknowledgement of correct reception of a “CP” frame (ACK-long) may be carried in either a “CP” or an “SUV” frame. Correct reception of an “SUV” frame is not acknowledged.

10  at least one “SUV” frame shall be transmitted and at least one “SUV” frame shall be received before a “CP” frame may be transmitted.  If, after sending the “CP” frame, an ACK is not received in a CP or SUV frame up to and including the first full CP or SUV frame received following a timeout of 100 ms plus 1 RTD, continuous “CP” frames shall be transmitted.  When a modem has sent an ACK and received either an ACK or E, it shall proceed into B1 followed by data mode 8.5 Agreed that the structure for rate renegotiation with silent intervals PCM00-032 (05/00) shall be as shown in PCM00-032:  Figure 3 when the APCM modem sets it’s silent bit  Figure 4 when both modems set their silent bits  Figure 4 or 5 when the DPCM modem sets it’s silent bit with the following changes:  modify Figure 3 to replace SCR with Eu followed by TRN2u  use the new CP exchange mechanism described in Item 8.4.3 o only SUV (not CP) frames can precede the silent interval 8.6 Agreed to the bit encodings for SV (renamed SUVu), SVa TR-30.1/00-05-056 (05/00) (renamed SUVd), CP (renamed CPu), and CPa (renamed CPd) as specified in TR-30.1/00-05-056 with minor modifications. For example:  SUVd bit 32 = silent bit  SUVu bits 27:31 = power measurement  SUVu bit 26 = requests the DPCM modem to wait until it receives CPu before transmitting CPd. The DPCM modem is not required to comply with the request.

 define a short CPu sequence used in rate renegotiation and fast parameter exchange procedures when the digital modem's modulation parameters are not transferred

9. Protocol support 9.1 Agreed that local flow control should be supported. (4/98)

10. Modem role: 10.1 Agreed that the analog modem shall take on a fixed role after (4/98) Phase 1, independent of which modem originated the call, provided that PCM mode has been successfully negotiated 11 during Phase 1.

11. Quick connect 11.1 Agreed to develop a quick connect mode (based on prior PCM99-010, (9/99) connection knowledge). PCM99-011, TR-30.1/99-10-042, TR-30.1/99-10-047, TR-30.1/99-10-051, TR-30.1/99-11-058, TR-30.1/99-11-059, TR-30.1/99-11-062, PCM00-005, PCM00-006, PCM00-011, PCM00-015, D.320, D.334, D.364, D.365, D.366, D.367, D.368, D.369, D.371, D.372

11.2 Agreed that Phase 1 of the quick connect procedure for V.92 shall D.364 (02/00) use the structure described in D.364 11.2.1 Agreed that QC & QCA shall use the same modulation as V.8 D.364 (02/00) and/or V.8bis as appropriate 11.2.2 Agreed that QC & QCA shall use the same framing as V.8 and/or PCM00-050, (02/00) V.8bis as appropriate. PCM00-057 (06/00) Specifically, the contents for V.8bis shall be: 2 mandatory flags, 3 optional flags, 1 octet for new message type and revision number (11010010, request to Q4/16), 1 octet Ucode for QTS, 2 octets FCS, 1 mandatory flag, and 2 optional flags Specifically, the contents for V.8 shall be: Ten ONES Synchronization sequence (0101010101, request to Q4/16) Ucode for QTS (coding still TBD) Ten ONES (transmitted twice?) 11.2.3 Agreed to specify 4 ANSpcm signals (-9, -12, -15 and –18 dBm), (02/00) and to specify the transmit level in QCA using 2 bits 11.2.3.1 Agreed to adopt the corrected 4 ANSpcm signals specified in TR- TR-30.1/00-03-037 (03/00) 30.1/00-03-037 11.2.3.2 Agreed that ANSpcm shall have a phase reversal period of 451.5 TR-30.1/00-03-027

12 (03/00) ms as described in TR-30.1/00-03-027 11.2.4 Agreed that QC can be sent in response to CRe or it can wait for (02/00) ANSam (e.g., a V.8 APCM modem talking to a V.8bis DPCM modem) 11.2.5 Agreed that INFOq shall be a 980 Hz tone and shall be referred to (02/00) as TONEq 11.2.6 Agreed that the QTS signal shall be the same as Sd from V.90, and (02/00) that the timing of signals is as follows: 70 ms of silence, 768T of QTS and 48T of QTS’. 11.2.7 Agreed that frame alignment shall be maintained from QTS TR-30.1/00-03-026 (03/00) onward. 11.3 Agreed that Phase 2 of the quick connect procedure for V.92 shall D.320 (02/00) use the structure illustrated in Figure 1 of D.320 (with minor corrections) 11.3.1 Agreed that bit 27 of INFO0 shall be used to indicate a shortened TR-30.1/00-03-039 (03/00) Phase 2 for quick connect. 11.3.2 Closed Should an additional phase reversal be added to the Phase TR-30.1/00-03-039, (04/00) 2 quick connect procedure to allow an APCM modem to PCM00-033 perform ranging (making ranging identical to that of the full startup procedure)? (see Issue 11.3 and Issue 11.7) 11.3.3 Agreed that a shortened Phase 2 shall not be allowed for an PCM00-026 (04/00) analogue modem that intends to connect in V.34 data mode 11.3.4 Agreed that a shortened Phase 2 shall only be used when both PCM00-026 (04/00) modems set bit 27 of INFO0 (see Issue 11.3.1). 11.3.5 Agreed that bit 33 in a shortened Phase 2 INFO1a shall be used to PCM00-026 (04/00) indicate the carrier frequency that the analogue modem shall use when connecting in V.90 data mode. 11.3.6 Agreed that Phase 2 error recovery shall be specified as described PCM00-033 (05/00) in PCM00-033, except that streaming INFOs can be followed by either a shortened or full Phase 2 according to the indication in INFO0 11.4 Agreed that the structure of Phases 3 & 4 of the quick connect (02/00) procedure for V.92 shall be the same as that of the full startup for the appropriate modulation mode (V.34, V.90 or V.92) that is to be entered. 11.5 Open Should call function and protocol category information be TR-30.1/00-03-039 Closed conveyed (in QC/QCA, INFO0, Phase3, Ja/Jd, or (06/00) CPu/CPd) during the quick connect procedure? 11.6 Agreed that V.92 shall not specify an optional early user data TR-30.1/00-03-039, (05/00) exchange during Phase 4 of the quick connect procedure PCM00-035 11.7 Agreed that error recovery for the Quick Connect procedure shall PCM00-033, (05/00) be specified as described in PCM00-042, except: PCM00-042  Uqts level  always enter V.92 Phase 2 after QC exchanges 11.7.1 Agreed that means for a pair of APCM modems to use the PCM00-042 (05/00) shortened Phase 1 startup shall be specified as described in PCM00-042 (analogue/digital modem bit)

13 11.8 Agreed to not specify a means to support future extension of QC to PCM00-060 (06/00) include additional information (such as V.8 call function)

12. Digital impairment learning 12.1 Agreed that means to learn upstream digital impairments PCM99-007 (9/99) (combinations of RBS and digital pads) shall be specified.

13. On-hook applications 13.1 Agreed that modulation shall not be defined for low-speed duplex PCM99-006 (04/00) on-hook use

14. Call waiting compatibility & modem on hold 14.1 Agreed to support compatibility with call waiting and as a PCM99-012, (9/99) minimum to develop a controlled call waiting clear down TR-30.1/99-10-043 procedure 14.1.1 Closed How should a “modem-on-hold” procedure be specified? PCM99-012 (02/00) (see Issue 14.1.2) 14.1.2 Agreed that V.92 shall use the modem-on-hold procedure detailed TR-30.1/99-11-061, (01/00) in PCM’00-022R1 PCM00-007, PCM00-010, PCM00-022R1 14.2 Agreed to redefine bits 12:15 in Table 19/V.92 (MH sequences) as TR-30.1/00-03-039 (03/00) follows: 0011 MHreq 0101 MHack 0111 MHnack 1001 MHclrd 1011 MHcda 1101 MHfrr 14.3 Agreed that two modems that understand that each other are V.92 TR-30.1/00-03-039 (05/00) capable shall support the modem-on-hold feature independent of the modulation mode selected. It was further agreed not to modify the V.90 MP sequence. 14.4 Agreed that the mechanism for reconnecting after modem-on-hold TR-30.1/00-03-039, (05/00) (as well as modem-on hold refusal) shall be a full startup PCM00-034 from the beginning of Phase 1 beginning with ANSam 14.4.1 Agreed that some form of answer tone shall be transmitted during PCM00-026 (04/00) the transition from modem-on-hold back to data mode. 14.5 Agreed to define, in accordance with PCM00-057, a cleardown PCM00-057 (06/00) indication in the QC sequence to make it possible for a modem in the on-hold state to be cleared down with a phase 1 signal 14.6 Agreed to timeouts for the modem-on-hold procedure in PCM00-059 (06/00) accordance with PCM00-059 and further consideration.

15. Draft text 15.1 Agreed that PCM00-025058R2, April June 2000 represents the PCM00-025

14 (04/00) latest approved draft text for V.92 (Title needs further PCM00-058R2 (06/00) consideration)

16. Testing facilities 16.1 Agreed to simply copy the first sentence of section 10 of V.90. (05/00)