M Modem 33k на плохой линии

[dvod]

Имеется dial-in сервер на m-modem 33k, на ati3 отвечает так
ati3
IDC M Modem V.34 firmware by Mike Telis, V2.20-V34_2M_DLP
Copyright (c) Inpro, 1998-2001
и имееются проблемы с коннектом. Есть подозрение на качество телефонных линий у отдельных пользователей... Начитавшись форума, добавил в строку инициализации следующее: S91=12S210.7=1
Вот статистика связи, снятая по AT#UD - два плохих коннекта, и два хороших... Обращает внимание на себя значение TX/RX signal power level. Вопрос естественный - какие ручки можно покрутить, чтобы улучшить ситуацию?
----------------------------------------------------------------------------
Diag Command Specification rev.: 1.0
Call Setup Result code : V.8bis signal detected
Multi-media mode : Data Only
DTE-DCE interface mode : Async data
TX/RX signal power level, -dBm : 12/47
Estimated noise level, -dBm : 76
TX/RX Negotiation : V.34/V.34
TX/RX Symbol Rate : 2400/2400
TX/RX Carrier frequency, Hz : 1600/1600
TX data rate (Last/Init) : 4800/4800
RX data rate (Last/Init) : 9600/7200
Temporary carrier loss count : 30
Carrier Rate Re-neg count : 4
Retrains Requested/Granted : 0/3
Protocol/Compression : V.42 LAPM/V.42bis
Error control frame size, bytes: 128
Error control timeouts in TX : 2
Error control NAKs received : 2
Compression dict. size, bytes : 2048
TX/RX flow control : V.24 ckt 106/133 / V.24 ckt 106/133
TX/RX chars sent : 14399242/10377
TX/RX chars lost (data overrun): 0/0
TX/RX I-Frame count : 1720/1341
TX/RX I-Frame error count : 2/3
Termination Cause : Dte Hangup Command
----------------------------------------------------------------------------
Diag Command Specification rev.: 1.0
Call Setup Result code : Fax Calling signal detected
Multi-media mode : Data Only
DTE-DCE interface mode : Async data
TX/RX signal power level, -dBm : 9/47
Estimated noise level, -dBm : 100
TX/RX Negotiation : V.23 Constant Carrier (1200/75) / V.23 Constant Carrier (1200/75)
TX/RX Symbol Rate : 1600/1600
TX/RX Carrier frequency, Hz : 1600/1600
TX data rate (Last/Init) : 9600/9600
RX data rate (Last/Init) : 9600/9600
Temporary carrier loss count : 0
Carrier Rate Re-neg count : 0
Retrains Requested/Granted : 0/0
Protocol/Compression : Disable/none / None
Error control frame size, bytes: 256
Error control timeouts in TX : 0
Error control NAKs received : 0
Compression dict. size, bytes : 0
TX/RX flow control : V.24 ckt 106/133 / V.24 ckt 106/133
TX/RX chars sent : 0/0
TX/RX chars lost (data overrun): 0/0
TX/RX I-Frame count : 0/0
TX/RX I-Frame error count : 0/0
Termination Cause : Dte Hangup Command
----------------------------------------------------------------------------
Diag Command Specification rev.: 1.0
Call Setup Result code : Data Calling signal detected
Multi-media mode : Data Only
DTE-DCE interface mode : Async data
TX/RX signal power level, -dBm : 12/24
Estimated noise level, -dBm : 67
TX/RX Negotiation : V.34/V.34
TX/RX Symbol Rate : 3000/3000
TX/RX Carrier frequency, Hz : 1800/1800
TX data rate (Last/Init) : 21600/21600
RX data rate (Last/Init) : 26400/26400
Temporary carrier loss count : 0
Carrier Rate Re-neg count : 0
Retrains Requested/Granted : 0/0
Protocol/Compression : V.42 LAPM/V.42bis
Error control frame size, bytes: 128
Error control timeouts in TX : 0
Error control NAKs received : 0
Compression dict. size, bytes : 2048
TX/RX flow control : V.24 ckt 106/133 / V.24 ckt 106/133
TX/RX chars sent : 281671/312
TX/RX chars lost (data overrun): 0/0
TX/RX I-Frame count : 26/13
TX/RX I-Frame error count : 0/0
Termination Cause : Dte Hangup Command
----------------------------------------------------------------------------
Diag Command Specification rev.: 1.0
Call Setup Result code : Data Calling signal detected
Multi-media mode : Data Only
DTE-DCE interface mode : Async data
TX/RX signal power level, -dBm : 12/24
Estimated noise level, -dBm : 65
TX/RX Negotiation : V.34/V.34
TX/RX Symbol Rate : 3200/3200
TX/RX Carrier frequency, Hz : 1829/1829
TX data rate (Last/Init) : 24000/24000
RX data rate (Last/Init) : 28800/28800
Temporary carrier loss count : 0
Carrier Rate Re-neg count : 0
Retrains Requested/Granted : 0/0
Protocol/Compression : V.42 LAPM/V.42bis
Error control frame size, bytes: 128
Error control timeouts in TX : 0
Error control NAKs received : 0
Compression dict. size, bytes : 2048
TX/RX flow control : V.24 ckt 106/133 / V.24 ckt 106/133
TX/RX chars sent : 282261/316
TX/RX chars lost (data overrun): 0/0
TX/RX I-Frame count : 26/15
TX/RX I-Frame error count : 0/0
Termination Cause : Dte Hangup Command

[Technical Support]

По статистике AT#UD мало что можно сказать, нужно также видеть AT%S и AT%S1 (от того же сеанса). В любом случае, поскольку Вы используете модемы "на передачу" (клиенты в основном "тянут" данные с Вашего сервера, а не посылают Вам), стоит установить уровень мощности передатчика повыше. Попробуйте поставить S91=6.
_________________
Inpro
Technical Support

[dvod]

[Technical Support]

Вы всё правильно понимаете, проблема у нас. За давностью лет забылось: в версии 2.20 для IDC M Modem была проблема с этими командами. Поэтому Вам либо нужно обновить микропрограмму (напишите в support@inpro.us.com, вышлем), либо пользоваться командами AT&V1, AT&V2.
_________________
Inpro
Technical Support

[dvod]

[dvod]

Итак, получил за вторник статистику командами &v1, &v2. Ситуация такая - многоканальный телефон, на 4 входах я поставил ATS91=6S210.7=1, на других четырех оставил настройки по умолчанию. В результате для -6дб получилось вот что:
скорость передачи/число коннектов
7200 2
9600 3
12000 3
14400 1
19200 6
21600 4
24000 21
26400 2
28800 5
33600 4
нет хэндшейка 2

а для настроек по умолчанию получилось вот что:
скорость передачи/число коннектов
7200 3
12000 2
14400 2
16800 3
19200 10
21600 13
24000 8
26400 3
33600 7
нет хэндшейка 6

И вот ниже рашифрованная статистика at&v2 от низкоскоростных коннектов - первые два варианта для уровня -6дб, а вторые - для настроек по умолчанию

Rockwell Diagnostics/W32, version 1.3.0.0, compiled at Jun 13 2002 22:35:24
(c) 2000 Stanislav V. Mekhanoshin (rampitec@tu.spb.ru, 2:5030/172.9@fidonet)
----------------------------------------------------------------------------
Connection time : 00:05:19
Handshake Time/Retries : 11 sec/0
TX Rate (Last/Init/Min/Max) : 7200/9600/4800/9600
RX Rate (Last/Init/Min/Max) : 9600/9600/4800/9600
Modulation/Protocol/Compression : V.34/LAPM/V.42bis
TX Symbol rate : 2400
TX/RX carrier frequency, Hz : 1600/1600
Signal Level (TX/Power Drop), -dB : 6/0
RX Signal Level (Last/Min/Max), -dB : 32/33/31
Band Edge Lower/Upper, Hz : 188/3675
Round trip delay, ms : 13.500
EQM Value (Last/Min/Max/Negative) : 44/10/127/0
EQM Samples Running Sum : 0000
EQM Last 10 Readings : 44 46 44 44 44 44 44 42 41 47
SNR Ratio (Last/Min/Max), dB : 10/10/22
TX/RX Non-linear Encoding : OFF/OFF
TX/RX Precoding : OFF/OFF
TX/RX Constellation Shaping : ON/ON
TX Trellis Encoding : 16 state
TX Pre-emphasis : 0
TX/RX state (Max TX/RX, Last TX/RX) : 87H/85H, 87H/67H
Error Correction Status : ODP:R ADP:T,R SABME:R UA:T XID:T,R SYNC
Energy at 3750Hz/Average Energy : 0/11
Retrains (Issued/Granted/Fast) : 0/1/0
Renegs (Issued/Granted) : 2/2
Retrans per frame/Frames rejected : 0/34
Total number of REJ sent/received : 34/10
Last Retrain/Reneg reason : Remote initiated a reneg
Last Retrain/Reneg requested : Remote Rate Renegotiation
Minutes Since Last Retrain/Reneg : 1
Disconnect reason : LOCAL REQUEST
Remote supports symbol rate (1,2,5) : 2743:ON 2800:ON 3429:ON 3429-TX:ON
Remote supports symbol rate (3,4) : 3000-L:ON 3000-H:ON 3200-L:ON 3200-H:ON
Remote power drop support : ON
Remote max symbol rate difference : 0 steps
Remote is a CME modem : No
Remote supports V.34bis : Yes
Remote frequency source : Internal
CRe/CRd/CL/MS/ACK/NAK received : No/Yes/No/Yes/No/No
V.8bis success/V.8bis neg started : Yes/Yes

Rockwell Diagnostics/W32, version 1.3.0.0, compiled at Jun 13 2002 22:35:24
(c) 2000 Stanislav V. Mekhanoshin (rampitec@tu.spb.ru, 2:5030/172.9@fidonet)
----------------------------------------------------------------------------
Connection time : 00:04:02
Handshake Time/Retries : 17 sec/1
TX Rate (Last/Init/Min/Max) : 7200/12000/7200/12000
RX Rate (Last/Init/Min/Max) : 16800/16800/16800/16800
Modulation/Protocol/Compression : V.34/LAPM/V.42bis
TX Symbol rate : 3200
TX/RX carrier frequency, Hz : 1829/1829
Signal Level (TX/Power Drop), -dB : 6/0
RX Signal Level (Last/Min/Max), -dB : 36/36/36
Band Edge Lower/Upper, Hz : 150/3675
Round trip delay, ms : 8.813
EQM Value (Last/Min/Max/Negative) : 32/25/37/0
EQM Samples Running Sum : 03BA
EQM Last 10 Readings : 30 33 32 31 30 29 33 30 29 29
SNR Ratio (Last/Min/Max), dB : 48/48/48
TX/RX Non-linear Encoding : OFF/ON
TX/RX Precoding : ON/ON
TX/RX Constellation Shaping : ON/ON
TX Trellis Encoding : 16 state
TX Pre-emphasis : 0
TX/RX state (Max TX/RX, Last TX/RX) : 87H/85H, 87H/67H
Error Correction Status : ODP:R ADP:T,R SABME:R UA:T XID:T,R SYNC
Energy at 3750Hz/Average Energy : 0/138
Retrains (Issued/Granted/Fast) : 0/0/0
Renegs (Issued/Granted) : 0/2
Retrans per frame/Frames rejected : 0/2
Total number of REJ sent/received : 2/19
Last Retrain/Reneg reason : Remote initiated a reneg
Last Retrain/Reneg requested : Remote Rate Renegotiation
Minutes Since Last Retrain/Reneg : 4
Disconnect reason : LOCAL REQUEST
Remote supports symbol rate (1,2,5) : 2743:ON 2800:ON 3429:ON 3429-TX:ON
Remote supports symbol rate (3,4) : 3000-L:ON 3000-H:ON 3200-L:ON 3200-H:ON
Remote power drop support : ON
Remote max symbol rate difference : 0 steps
Remote is a CME modem : No
Remote supports V.34bis : Yes
Remote frequency source : Internal
CRe/CRd/CL/MS/ACK/NAK received : No/Yes/No/No/No/No
V.8bis success/V.8bis neg started : No/Yes

Rockwell Diagnostics/W32, version 1.3.0.0, compiled at Jun 13 2002 22:35:24
(c) 2000 Stanislav V. Mekhanoshin (rampitec@tu.spb.ru, 2:5030/172.9@fidonet)
----------------------------------------------------------------------------
Connection time : 00:03:33
Handshake Time/Retries : 11 sec/0
TX Rate (Last/Init/Min/Max) : 4800/4800/4800/7200
RX Rate (Last/Init/Min/Max) : 7200/4800/4800/9600
Modulation/Protocol/Compression : V.34/LAPM/V.42bis
TX Symbol rate : 2400
TX/RX carrier frequency, Hz : 1600/1600
Signal Level (TX/Power Drop), -dB : 9/0
RX Signal Level (Last/Min/Max), -dB : NA/39/31
Band Edge Lower/Upper, Hz : 150/3675
Round trip delay, ms : 14.333
EQM Value (Last/Min/Max/Negative) : 127/9/127/0
EQM Samples Running Sum : 0000
EQM Last 10 Readings : 127 127 127 127 126 126 21 20 11 12
SNR Ratio (Last/Min/Max), dB : 22/22/22
TX/RX Non-linear Encoding : OFF/OFF
TX/RX Precoding : OFF/OFF
TX/RX Constellation Shaping : ON/ON
TX Trellis Encoding : 16 state
TX Pre-emphasis : 0
TX/RX state (Max TX/RX, Last TX/RX) : 87H/67H, 20H/21H
Error Correction Status : ODP:R ADP:T,R SABME:R UA:T XID:T,R SYNC
Energy at 3750Hz/Average Energy : 0/90
Retrains (Issued/Granted/Fast) : 0/1/0
Renegs (Issued/Granted) : 7/3
Retrans per frame/Frames rejected : 0/5
Total number of REJ sent/received : 5/5
Last Retrain/Reneg reason : Fall-back due to high EQM
Last Retrain/Reneg requested : Local Rate Renegotiation
Minutes Since Last Retrain/Reneg : 0
Disconnect reason : LOCAL REQUEST
Remote supports symbol rate (1,2,5) : 2743:ON 2800:ON 3429:ON 3429-TX:ON
Remote supports symbol rate (3,4) : 3000-L:ON 3000-H:ON 3200-L:ON 3200-H:ON
Remote power drop support : ON
Remote max symbol rate difference : 0 steps
Remote is a CME modem : No
Remote supports V.34bis : Yes
Remote frequency source : Internal
CRe/CRd/CL/MS/ACK/NAK received : No/Yes/No/Yes/No/No
V.8bis success/V.8bis neg started : Yes/Yes
Workaround used : V90Phase2Escape
Workaround used : ABCODE check (machine-gun noise WA)

Rockwell Diagnostics/W32, version 1.3.0.0, compiled at Jun 13 2002 22:35:24
(c) 2000 Stanislav V. Mekhanoshin (rampitec@tu.spb.ru, 2:5030/172.9@fidonet)
----------------------------------------------------------------------------
Connection time : 00:05:56
Handshake Time/Retries : 11 sec/0
TX Rate (Last/Init/Min/Max) : 7200/4800/4800/7200
RX Rate (Last/Init/Min/Max) : 9600/4800/2400/9600
Modulation/Protocol/Compression : V.34/LAPM/V.42bis
TX Symbol rate : 2400
TX/RX carrier frequency, Hz : 1600/1600
Signal Level (TX/Power Drop), -dB : 9/0
RX Signal Level (Last/Min/Max), -dB : NA/32/31
Band Edge Lower/Upper, Hz : 150/3675
Round trip delay, ms : 13.500
EQM Value (Last/Min/Max/Negative) : 126/5/127/0
EQM Samples Running Sum : 0000
EQM Last 10 Readings : 127 127 126 126 127 127 37 37 38 38
SNR Ratio (Last/Min/Max), dB : 24/22/24
TX/RX Non-linear Encoding : OFF/OFF
TX/RX Precoding : OFF/OFF
TX/RX Constellation Shaping : ON/ON
TX Trellis Encoding : 16 state
TX Pre-emphasis : 0
TX/RX state (Max TX/RX, Last TX/RX) : 87H/67H, 20H/21H
Error Correction Status : ODP:R ADP:T,R SABME:R UA:T XID:T,R SYNC
Energy at 3750Hz/Average Energy : 0/109
Retrains (Issued/Granted/Fast) : 0/1/0
Renegs (Issued/Granted) : 7/8
Retrans per frame/Frames rejected : 0/3
Total number of REJ sent/received : 3/14
Last Retrain/Reneg reason : Fall-back due to high EQM
Last Retrain/Reneg requested : Local Rate Renegotiation
Minutes Since Last Retrain/Reneg : 0
Disconnect reason : LOCAL REQUEST
Remote supports symbol rate (1,2,5) : 2743:ON 2800:ON 3429:ON 3429-TX:ON
Remote supports symbol rate (3,4) : 3000-L:ON 3000-H:ON 3200-L:ON 3200-H:ON
Remote power drop support : ON
Remote max symbol rate difference : 0 steps
Remote is a CME modem : No
Remote supports V.34bis : Yes
Remote frequency source : Internal
CRe/CRd/CL/MS/ACK/NAK received : No/Yes/No/Yes/No/No
V.8bis success/V.8bis neg started : Yes/Yes
Workaround used : V90Phase2Escape
Workaround used : RateRenegFailure
Workaround used : ABCODE check (machine-gun noise WA)

-------------------------------------------------------------------------------------
Можно ли еще что-то покрутить в прошивке 2.20, или дождаться 2.24 и попробовать ее?

[Technical Support]

[dvod]

[Technical Support]

[dvod]