Слишком много запрашиваемых ретрейнов. IDC-5614BXL/VR+

[kai666]

Есть модем IDC-5614BXL/VR+. Во время работы модем запрашивает очень много ретрейнов, приблизительно раз в минуту. Модем на другой стороне - ZyXEL Omni 56K. При работе с другим удаленным модемом (тоже IDC-5614), сидящем на другом телефонном номере наблюдается та же картина с кучей ретрейнов. АТС с моей стороны российская цифровая МТ-20/2 (не фонтан, конечно). Что можно попробовать покрутить для снижения количества ретрейнов? Вот типичная статистика:

Inpro IDC Modems Diagnostics, Version 1.0.1.30
12.07.03 5:00:31 - Outbound Call by Remote Access
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.23

Time Online.................. 04:50:22
Termination Reason........... LOCAL REQUEST
Tx Rate (Last/Init/Min/Max).. 28800/33600/ 7200/33600 bps
Rx Rate (Last/Init/Min/Max).. 33600/33600/ 4800/33600 bps
Modulation................... V.34bis
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 23
Tx/Power Drop/Rx Level....... 15/0/25
SNR Last/Min/Max............. 43/39/43
Highest Rx/Tx State.......... 67/67
EQM Sum...................... 0019
RBS Pattern.................. NA
Rate Drop.................... NA
Digital Loss................. None
Retrains Issued/Granted/Auto. 236/1/0
Renegs Issued/Granted........ 2/151
FForwards/FBacks/Denied...... 71/167/0
Forced FB/FB after FF/MaxREJ. 0/0/1
Last dialed number........... PXXXXXX
Flex fail


Symbol Rate.................. 3429
Carrier Frequency Hz, Rx/Tx.. 1959/1959
EQM Value (Last/Min/Max)..... 23/0/127
EQM Hits..................... 0
EQM Last 10 Readings......... 27 24 23 23 26 24 24 25 26 24
Last Retrain/Reneg Status.... Local Retrain
Last Retrain/Reneg Reason.... Local Fallforward due to Low EQM
Last Retrain/Reneg Time...... 2 minutes ago
Handshake Time/Retries....... 11 seconds/0
Non-linear Encoding, Rx/Tx... ON/ON
Precoding, Rx/Tx............. ON/OFF
Shaping, Rx/Tx............... ON/OFF
Trellis Encoding, Tx......... 64 state
Pre-Emphasis Index, Tx....... 9
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 1,4
Last Rx/Tx State............. 67/67
Energy at 3750Hz/Average .... 308/106
V.8 Negotiation Started...... Yes
V.8bis Success............... No
V.8bis CRe,CRd,CL,MS,ACK,NAK. No/No/No/No/No/No
Remote supports Symbol Rates. 2743 3429 3000(L) 3000(H)
Remote supports Symbol Rates. 3200(L) 3200(H) 3429(Tx)
Remote supports Power Drop... Yes
Remote is CME Modem.......... No
Remote supports V.34bis...... Yes
Remote Max SR Difference..... 0 Symbol Rate Steps
Remote Frequency Source...... Internal
Error Correction Status Byte. ADP:T ADP:R ODP:R
Error Correction Status Byte. SYNC UA:T UA:R SAMBE:R XID:T XID:R
Frames REJected, Last/Total.. 1/203
Frames Errors, Rx/Tx......... 203/44 (0,0%/0,0%)
Frames Count, Rx/Tx.......... 415307/96266
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 95
Error Control Link NAKs...... 44
Compression Dictionary Size.. V.42bis (1024)
Characters Received.......... 45998585
Characters Sent.............. 717564
Average CPS, Rx/Tx........... 2640/41
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 68

[Technical Support]

Судя по всему, Вы уже "покрутили" Такое количество перетренировок связано с запретом FF/FB (Вы прописали команду %E1 или %E0).

Давайте сделаем так: Вы вернёте модем к заводским настройкам командой:

at *nc22 w2 \v1 s95=3 &w &w1

вычистите всё из строки инициализации и затем пришлёте статистику.

"Крутить" нужно с умом...
_________________
Inpro
Technical Support

[kai666]

Я прописал %E2, потому что при дефолтном %E3 удаленный модем (ZyXEL Omni 56K) почему-то бросает трубку через несколько минут после установления связи (статистика ниже). Сейчас я вернул модем к заводским установкам с помощью указанной вами строки. Но %E2 пришлось вернуть - невозможно работать, когда связь постоянно падает, кроме этого в строке инициализации ничего значимого нет (M2L3&C). &C необходимо для работы скрипта установки связи с callback, потому что менее кривой способ в Win98 невозможен (при пропадании CD Windows отменяет соединение). Сейчас посижу, наберу статистику при таких настройках.

Inpro IDC Modems Diagnostics, Version 1.0.1.31
15.07.03 0:32:56 - Direct Log Write Entry
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.23

Time Online.................. 00:03:01
Termination Reason........... RETRAIN FAILURE
Tx Rate (Last/Init/Min/Max).. 28800/28800/26400/31200 bps
Rx Rate (Last/Init/Min/Max).. 33600/33600/24000/33600 bps
Modulation................... V.34bis
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 127
Tx/Power Drop/Rx Level....... 9/0/NA
SNR Last/Min/Max............. 41/41/43
Highest Rx/Tx State.......... 67/84
EQM Sum...................... 0019
RBS Pattern.................. NA
Rate Drop.................... NA
Digital Loss................. None
Retrains Issued/Granted/Auto. 1/0/1
Renegs Issued/Granted........ 1/3
FForwards/FBacks/Denied...... 0/2/0
Forced FB/FB after FF/MaxREJ. 0/0/1
Last dialed number........... P222222
Flex fail


Symbol Rate.................. 3429
Carrier Frequency Hz, Rx/Tx.. 1959/1959
EQM Value (Last/Min/Max)..... 127/21/127
EQM Hits..................... 0
EQM Last 10 Readings......... 127 127 127 127 125 125 26 27 24 25
Last Retrain/Reneg Status.... Local Rate Renegotiation
Last Retrain/Reneg Reason.... Local Fallback due to High EQM
Last Retrain/Reneg Time...... 1 minutes ago
Handshake Time/Retries....... 11 seconds/0
Non-linear Encoding, Rx/Tx... ON/ON
Precoding, Rx/Tx............. ON/OFF
Shaping, Rx/Tx............... ON/OFF
Trellis Encoding, Tx......... 64 state
Pre-Emphasis Index, Tx....... 9
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 1,7
Last Rx/Tx State............. 20/21
Energy at 3750Hz/Average .... 303/106
Last AGC Gain Value.......... 0
Minimum AGC Gain Value....... 72
Maximum AGC Gain Value....... 74
V.8 Negotiation Started...... Yes
V.8bis Success............... No
V.8bis CRe,CRd,CL,MS,ACK,NAK. No/No/No/No/No/No
Remote supports Symbol Rates. 2743 3429 3000(L) 3000(H)
Remote supports Symbol Rates. 3200(L) 3200(H) 3429(Tx)
Remote supports Power Drop... Yes
Remote is CME Modem.......... No
Remote supports V.34bis...... Yes
Remote Max SR Difference..... 0 Symbol Rate Steps
Remote Frequency Source...... Internal
Workaround Used.............. V90 Phase 2 Escape
Workaround Used.............. Rate Reneg Failure (At 64 or 84)
Workaround Used.............. V34 Codex WA/V34 Stuck Phase2
Error Correction Status Byte. ADP:T ADP:R ODP:R
Error Correction Status Byte. SYNC UA:T SAMBE:R XID:T XID:R
Frames REJected, Last/Total.. 0/1
Frames Errors, Rx/Tx......... 1/0 (0,0%/0,0%)
Frames Count, Rx/Tx.......... 3308/909
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 13
Error Control Link NAKs...... 0
Compression Dictionary Size.. V.42bis (1024)
Characters Received.......... 377996
Characters Sent.............. 11419
Average CPS, Rx/Tx........... 2088/63
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 93


Inpro IDC Modems Diagnostics, Version 1.0.1.31
15.07.03 0:25:14 - Direct Log Write Entry
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.23

Time Online.................. 00:02:30
Termination Reason........... RETRAIN FAILURE
Tx Rate (Last/Init/Min/Max).. 31200/31200/31200/31200 bps
Rx Rate (Last/Init/Min/Max).. 33600/33600/33600/33600 bps
Modulation................... V.34bis
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 127
Tx/Power Drop/Rx Level....... 9/0/NA
SNR Last/Min/Max............. 43/43/43
Highest Rx/Tx State.......... 67/84
EQM Sum...................... 001B
RBS Pattern.................. NA
Rate Drop.................... NA
Digital Loss................. None
Retrains Issued/Granted/Auto. 0/0/1
Renegs Issued/Granted........ 1/0
FForwards/FBacks/Denied...... 0/1/0
Forced FB/FB after FF/MaxREJ. 0/0/0
Last dialed number........... P222222
Flex fail


Symbol Rate.................. 3429
Carrier Frequency Hz, Rx/Tx.. 1959/1959
EQM Value (Last/Min/Max)..... 127/23/127
EQM Hits..................... 0
EQM Last 10 Readings......... 127 127 127 127 126 126 25 26 26 25
Last Retrain/Reneg Status.... Local Rate Renegotiation
Last Retrain/Reneg Reason.... Local Fallback due to High EQM
Last Retrain/Reneg Time...... 0 minutes ago
Handshake Time/Retries....... 11 seconds/0
Non-linear Encoding, Rx/Tx... ON/ON
Precoding, Rx/Tx............. ON/OFF
Shaping, Rx/Tx............... ON/OFF
Trellis Encoding, Tx......... 64 state
Pre-Emphasis Index, Tx....... 9
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 1,4
Last Rx/Tx State............. 20/21
Energy at 3750Hz/Average .... 308/105
Last AGC Gain Value.......... 0
Minimum AGC Gain Value....... 73
Maximum AGC Gain Value....... 74
V.8 Negotiation Started...... Yes
V.8bis Success............... No
V.8bis CRe,CRd,CL,MS,ACK,NAK. No/No/No/No/No/No
Remote supports Symbol Rates. 2743 3429 3000(L) 3000(H)
Remote supports Symbol Rates. 3200(L) 3200(H) 3429(Tx)
Remote supports Power Drop... Yes
Remote is CME Modem.......... No
Remote supports V.34bis...... Yes
Remote Max SR Difference..... 0 Symbol Rate Steps
Remote Frequency Source...... Internal
Workaround Used.............. V90 Phase 2 Escape
Workaround Used.............. Rate Reneg Failure (At 64 or 84)
Workaround Used.............. V34 Codex WA/V34 Stuck Phase2
Error Correction Status Byte. ADP:T ADP:R ODP:R
Error Correction Status Byte. SYNC UA:T SAMBE:R XID:T XID:R
Frames REJected, Last/Total.. 0/0
Frames Errors, Rx/Tx......... 0/0 (0,0%/0,0%)
Frames Count, Rx/Tx.......... 3488/960
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 6
Error Control Link NAKs...... 0
Compression Dictionary Size.. V.42bis (1024)
Characters Received.......... 430678
Characters Sent.............. 11732
Average CPS, Rx/Tx........... 2871/78
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 95

[kai666]

Вот статистика после *nc22...&w и с %E2 в строке инициализации. Termination Reason такой потому что я оборвал связь во время ретрейна. Ну так что, это не лечится?


Inpro IDC Modems Diagnostics, Version 1.0.1.31
15.07.03 1:33:28 - Outbound Call by Remote Access
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.23

Time Online.................. 00:57:12
Termination Reason........... NO REMOTE RESPONSE
Tx Rate (Last/Init/Min/Max).. 31200/31200/26400/33600 bps
Rx Rate (Last/Init/Min/Max).. 33600/33600/ 9600/33600 bps
Modulation................... V.34bis
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 127
Tx/Power Drop/Rx Level....... 9/0/19
SNR Last/Min/Max............. 43/39/43
Highest Rx/Tx State.......... 28/67
EQM Sum...................... 0019
RBS Pattern.................. NA
Rate Drop.................... NA
Digital Loss................. None
Retrains Issued/Granted/Auto. 48/1/0
Renegs Issued/Granted........ 1/16
FForwards/FBacks/Denied...... 15/34/0
Forced FB/FB after FF/MaxREJ. 0/0/1
Last dialed number........... P222222
Flex fail


Symbol Rate.................. 3429
Carrier Frequency Hz, Rx/Tx.. 1959/1959
EQM Value (Last/Min/Max)..... 127/0/127
EQM Hits..................... 0
EQM Last 10 Readings......... 127 127 127 127 127 127 35 25 27 26
Last Retrain/Reneg Status.... Local Retrain
Last Retrain/Reneg Reason.... Local Fallback due to High EQM
Last Retrain/Reneg Time...... 0 minutes ago
Handshake Time/Retries....... 10 seconds/0
Non-linear Encoding, Rx/Tx... ON/ON
Precoding, Rx/Tx............. ON/OFF
Shaping, Rx/Tx............... ON/OFF
Trellis Encoding, Tx......... 64 state
Pre-Emphasis Index, Tx....... 9
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 1,7
Last Rx/Tx State............. 28/28
Energy at 3750Hz/Average .... 307/106
Last AGC Gain Value.......... 91
Minimum AGC Gain Value....... 69
Maximum AGC Gain Value....... 91
V.8 Negotiation Started...... Yes
V.8bis Success............... No
V.8bis CRe,CRd,CL,MS,ACK,NAK. No/No/No/No/No/No
Remote supports Symbol Rates. 2743 3429 3000(L) 3000(H)
Remote supports Symbol Rates. 3200(L) 3200(H) 3429(Tx)
Remote supports Power Drop... Yes
Remote is CME Modem.......... No
Remote supports V.34bis...... Yes
Remote Max SR Difference..... 0 Symbol Rate Steps
Remote Frequency Source...... Internal
Error Correction Status Byte. ADP:T ADP:R ODP:R
Error Correction Status Byte. SYNC UA:T SAMBE:R XID:T XID:R
Frames REJected, Last/Total.. 6/37
Frames Errors, Rx/Tx......... 37/7 (0,1%/0,0%)
Frames Count, Rx/Tx.......... 73951/18622
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 150
Error Control Link NAKs...... 7
Compression Dictionary Size.. V.42bis (1024)
Characters Received.......... 8656243
Characters Sent.............. 300239
Average CPS, Rx/Tx........... 2522/87
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 62

[Technical Support]

Попробуйте S117=30 и %E3 (как по умолчанию) - должно полегчать.
_________________
Inpro
Technical Support

[kai666]

Я перепробовал различные значения S117 при %E3, но удаленный модем через некоторое время все равно бросает трубку при ретрейне. Вот статистика самого долгого сеанса связи (при максимальном значении S117).

Inpro IDC Modems Diagnostics, Version 1.0.1.31
15.07.03 13:10:37 - Outbound Call by Remote Access
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.23

Time Online.................. 00:13:07
Termination Reason........... RETRAIN FAILURE
Tx Rate (Last/Init/Min/Max).. 28800/28800/24000/31200 bps
Rx Rate (Last/Init/Min/Max).. 28800/33600/26400/33600 bps
Modulation................... V.34bis
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 126
Tx/Power Drop/Rx Level....... 9/0/NA
SNR Last/Min/Max............. 43/37/43
Highest Rx/Tx State.......... 67/87
EQM Sum...................... 0019
RBS Pattern.................. NA
Rate Drop.................... NA
Digital Loss................. None
Retrains Issued/Granted/Auto. 7/0/1
Renegs Issued/Granted........ 3/6
FForwards/FBacks/Denied...... 0/5/0
Forced FB/FB after FF/MaxREJ. 0/0/1
Last dialed number........... P222222
Flex fail


Symbol Rate.................. 3429
Carrier Frequency Hz, Rx/Tx.. 1959/1959
EQM Value (Last/Min/Max)..... 126/23/127
EQM Hits..................... 0
EQM Last 10 Readings......... 127 127 127 127 127 127 25 26 23 27
Last Retrain/Reneg Status.... Local Rate Renegotiation
Last Retrain/Reneg Reason.... Local Fallback due to High EQM
Last Retrain/Reneg Time...... 1 minutes ago
Handshake Time/Retries....... 10 seconds/0
Non-linear Encoding, Rx/Tx... ON/ON
Precoding, Rx/Tx............. ON/OFF
Shaping, Rx/Tx............... ON/OFF
Trellis Encoding, Tx......... 64 state
Pre-Emphasis Index, Tx....... 9
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 1,7
Last Rx/Tx State............. 20/21
Energy at 3750Hz/Average .... 306/108
Last AGC Gain Value.......... 0
Minimum AGC Gain Value....... 69
Maximum AGC Gain Value....... 74
V.8 Negotiation Started...... Yes
V.8bis Success............... No
V.8bis CRe,CRd,CL,MS,ACK,NAK. No/No/No/No/No/No
Remote supports Symbol Rates. 2743 3429 3000(L) 3000(H)
Remote supports Symbol Rates. 3200(L) 3200(H) 3429(Tx)
Remote supports Power Drop... Yes
Remote is CME Modem.......... No
Remote supports V.34bis...... Yes
Remote Max SR Difference..... 0 Symbol Rate Steps
Remote Frequency Source...... Internal
Workaround Used.............. V90 Phase 2 Escape
Workaround Used.............. Rate Reneg Failure (At 64 or 84)
Workaround Used.............. V34 Codex WA/V34 Stuck Phase2
Error Correction Status Byte. ADP:T ADP:R ODP:R
Error Correction Status Byte. SYNC UA:T SAMBE:R XID:T XID:R
Frames REJected, Last/Total.. 2/8
Frames Errors, Rx/Tx......... 8/0 (0,0%/0,0%)
Frames Count, Rx/Tx.......... 18421/4671
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 49
Error Control Link NAKs...... 0
Compression Dictionary Size.. V.42bis (1024)
Characters Received.......... 2149539
Characters Sent.............. 64097
Average CPS, Rx/Tx........... 2731/81
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 95

[kai666]

Уже сорок минут связь не обрывается при %E3 S117=255. Но ретрейны все равно слышатся довольно часто.

[Technical Support]

[kai666]

Ну, я все-таки не полный чайник, чтобы забыть где-нибудь лишние установки инициализации. Вот статистика после обрыва связи во время ретрейна.


Inpro IDC Modems Diagnostics, Version 1.0.1.31
15.07.03 21:19:49 - Direct Log Write Entry
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.23

Time Online.................. 00:03:23
Termination Reason........... NO REMOTE RESPONSE
Tx Rate (Last/Init/Min/Max).. 24000/28800/24000/28800 bps
Rx Rate (Last/Init/Min/Max).. 26400/33600/26400/33600 bps
Modulation................... V.34bis
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 127
Tx/Power Drop/Rx Level....... 15/0/27
SNR Last/Min/Max............. 43/43/43
Highest Rx/Tx State.......... 67/87
EQM Sum...................... 0019
RBS Pattern.................. NA
Rate Drop.................... NA
Digital Loss................. None
Retrains Issued/Granted/Auto. 2/0/0
Renegs Issued/Granted........ 1/2
FForwards/FBacks/Denied...... 0/2/0
Forced FB/FB after FF/MaxREJ. 0/0/1
Last dialed number........... P222222
Flex fail


Symbol Rate.................. 3429
Carrier Frequency Hz, Rx/Tx.. 1959/1959
EQM Value (Last/Min/Max)..... 127/21/127
EQM Hits..................... 0
EQM Last 10 Readings......... 127 127 127 127 127 126 126 126 126 127
Last Retrain/Reneg Status.... Local Retrain
Last Retrain/Reneg Reason.... Local Retrain due to 3 Consecutive Renegs
Last Retrain/Reneg Time...... 0 minutes ago
Handshake Time/Retries....... 10 seconds/0
Non-linear Encoding, Rx/Tx... ON/ON
Precoding, Rx/Tx............. ON/OFF
Shaping, Rx/Tx............... ON/OFF
Trellis Encoding, Tx......... 64 state
Pre-Emphasis Index, Tx....... 9
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 1,7
Last Rx/Tx State............. 2E/46
Energy at 3750Hz/Average .... 310/109
Last AGC Gain Value.......... 68
Minimum AGC Gain Value....... 68
Maximum AGC Gain Value....... 74
V.8 Negotiation Started...... Yes
V.8bis Success............... No
V.8bis CRe,CRd,CL,MS,ACK,NAK. No/No/No/No/No/No
Remote supports Symbol Rates. 2743 3429 3000(L) 3000(H)
Remote supports Symbol Rates. 3200(L) 3200(H) 3429(Tx)
Remote supports Power Drop... Yes
Remote is CME Modem.......... No
Remote supports V.34bis...... Yes
Remote Max SR Difference..... 0 Symbol Rate Steps
Remote Frequency Source...... Internal
Error Correction Status Byte. ADP:T ADP:R ODP:R
Error Correction Status Byte. SYNC UA:T SAMBE:R XID:T XID:R
Frames REJected, Last/Total.. 2/1
Frames Errors, Rx/Tx......... 1/1 (0,1%/0,2%)
Frames Count, Rx/Tx.......... 1273/537
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 10
Error Control Link NAKs...... 1
Compression Dictionary Size.. V.42bis (1024)
Characters Received.......... 212750
Characters Sent.............. 21934
Average CPS, Rx/Tx........... 1048/108
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 70

[Technical Support]

Попробуйте ограничить скорость соединения до 28800 или даже 26400 бит/с:

+MS=11,,,26400

Эту команду нужно прописать в строке инициализации в свойствах модема. Как альтернатива: установите S17 в большое значение (например, 200). Задача простая: снизить скорость приёма, выбираемую после перетренировок.
_________________
Inpro
Technical Support

[kai666]

Первая статистика с +MS=11,,,26400, вторая с S17=200.
В общем, видимо не судьба... :-(


Inpro IDC Modems Diagnostics, Version 1.0.1.31
16.07.03 14:58:49 - Outbound Call by Remote Access
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.23

Time Online.................. 00:36:00
Termination Reason........... LOCAL REQUEST
Tx Rate (Last/Init/Min/Max).. 26400/26400/19200/26400 bps
Rx Rate (Last/Init/Min/Max).. 26400/26400/19200/26400 bps
Modulation................... V.34bis
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 5
Tx/Power Drop/Rx Level....... 15/0/25
SNR Last/Min/Max............. 43/41/43
Highest Rx/Tx State.......... 67/87
EQM Sum...................... 0047
RBS Pattern.................. NA
Rate Drop.................... NA
Digital Loss................. None
Retrains Issued/Granted/Auto. 20/0/0
Renegs Issued/Granted........ 11/22
FForwards/FBacks/Denied...... 0/22/0
Forced FB/FB after FF/MaxREJ. 0/0/1
Last dialed number........... P197417
Flex fail


Symbol Rate.................. 3429
Carrier Frequency Hz, Rx/Tx.. 1959/1959
EQM Value (Last/Min/Max)..... 5/4/127
EQM Hits..................... 0
EQM Last 10 Readings......... 5 5 5 4 5 4 5 4 5 5
Last Retrain/Reneg Status.... Local Retrain
Last Retrain/Reneg Reason.... Local Retrain due to 3 Consecutive Renegs
Last Retrain/Reneg Time...... 1 minutes ago
Handshake Time/Retries....... 11 seconds/0
Non-linear Encoding, Rx/Tx... ON/ON
Precoding, Rx/Tx............. ON/OFF
Shaping, Rx/Tx............... ON/OFF
Trellis Encoding, Tx......... 64 state
Pre-Emphasis Index, Tx....... 9
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 1,7
Last Rx/Tx State............. 67/67
Energy at 3750Hz/Average .... 305/108
Last AGC Gain Value.......... 73
Minimum AGC Gain Value....... 68
Maximum AGC Gain Value....... 74
V.8 Negotiation Started...... Yes
V.8bis Success............... No
V.8bis CRe,CRd,CL,MS,ACK,NAK. No/No/No/No/No/No
Remote supports Symbol Rates. 2743 3429 3000(L) 3000(H)
Remote supports Symbol Rates. 3200(L) 3200(H) 3429(Tx)
Remote supports Power Drop... Yes
Remote is CME Modem.......... No
Remote supports V.34bis...... Yes
Remote Max SR Difference..... 0 Symbol Rate Steps
Remote Frequency Source...... Internal
Error Correction Status Byte. ADP:T ADP:R ODP:R
Error Correction Status Byte. SYNC UA:T UA:R SAMBE:R XID:T XID:R
Frames REJected, Last/Total.. 1/20
Frames Errors, Rx/Tx......... 20/2 (0,1%/0,0%)
Frames Count, Rx/Tx.......... 36253/9057
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 80
Error Control Link NAKs...... 2
Compression Dictionary Size.. V.42bis (1024)
Characters Received.......... 4171766
Characters Sent.............. 99714
Average CPS, Rx/Tx........... 1931/46
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 68



Inpro IDC Modems Diagnostics, Version 1.0.1.31
16.07.03 14:20:44 - Outbound Call by Remote Access
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.23

Time Online.................. 00:30:08
Termination Reason........... LOCAL REQUEST
Tx Rate (Last/Init/Min/Max).. 28800/28800/24000/33600 bps
Rx Rate (Last/Init/Min/Max).. 31200/31200/26400/33600 bps
Modulation................... V.34bis
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 15
Tx/Power Drop/Rx Level....... 15/0/25
SNR Last/Min/Max............. 43/41/43
Highest Rx/Tx State.......... 67/87
EQM Sum...................... 0047
RBS Pattern.................. NA
Rate Drop.................... NA
Digital Loss................. None
Retrains Issued/Granted/Auto. 17/0/0
Renegs Issued/Granted........ 22/17
FForwards/FBacks/Denied...... 14/16/0
Forced FB/FB after FF/MaxREJ. 0/0/2
Last dialed number........... P197417
Flex fail


Symbol Rate.................. 3429
Carrier Frequency Hz, Rx/Tx.. 1959/1959
EQM Value (Last/Min/Max)..... 15/12/127
EQM Hits..................... 0
EQM Last 10 Readings......... 14 16 14 15 13 15 126 127 127 127
Last Retrain/Reneg Status.... Local Retrain
Last Retrain/Reneg Reason.... Local Retrain due to 3 Consecutive Renegs
Last Retrain/Reneg Time...... 1 minutes ago
Handshake Time/Retries....... 11 seconds/0
Non-linear Encoding, Rx/Tx... ON/ON
Precoding, Rx/Tx............. ON/OFF
Shaping, Rx/Tx............... ON/OFF
Trellis Encoding, Tx......... 64 state
Pre-Emphasis Index, Tx....... 9
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 1,7
Last Rx/Tx State............. 67/67
Energy at 3750Hz/Average .... 305/108
Last AGC Gain Value.......... 73
Minimum AGC Gain Value....... 70
Maximum AGC Gain Value....... 74
V.8 Negotiation Started...... Yes
V.8bis Success............... No
V.8bis CRe,CRd,CL,MS,ACK,NAK. No/No/No/No/No/No
Remote supports Symbol Rates. 2743 3429 3000(L) 3000(H)
Remote supports Symbol Rates. 3200(L) 3200(H) 3429(Tx)
Remote supports Power Drop... Yes
Remote is CME Modem.......... No
Remote supports V.34bis...... Yes
Remote Max SR Difference..... 0 Symbol Rate Steps
Remote Frequency Source...... Internal
Error Correction Status Byte. ADP:T ADP:R ODP:R
Error Correction Status Byte. SYNC UA:T UA:R SAMBE:R XID:T XID:R
Frames REJected, Last/Total.. 1/26
Frames Errors, Rx/Tx......... 26/3 (0,1%/0,0%)
Frames Count, Rx/Tx.......... 44436/10912
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 108
Error Control Link NAKs...... 3
Compression Dictionary Size.. V.42bis (1024)
Characters Received.......... 5032209
Characters Sent.............. 144300
Average CPS, Rx/Tx........... 2783/79
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 68

[Technical Support]

Поясним, что тут происходит. Если сравнить статистику без ограничения скорости:

Rx Rate (Last/Init/Min/Max).. 26400/33600/26400/33600 bps

и с ограничением до 26400:

Rx Rate (Last/Init/Min/Max).. 26400/26400/19200/26400 bps

то можно заметить, что разница между максимальной и минимальной скоростью составляет 7200 бит/с. Дело в том, что у модема есть механизм, препятствующий "синдрому спиральной смерти", когда модем постепенно снижает скорость до минимальной. Допустим, скорость приёма 33600 и возникает помеха. Модем снижает скорость до 31200. Некоторое (короткое) время всё хорошо, и опять помеха. Скорость снижается уже до 28800. Если промежутки времени между помехами короче, чем нужно модему для того, чтобы решиться на fall-forward (подъём скорости), то скорость бы падала до минимальной (что и происходит с модемами некоторых марок). Ваш же модем инициирует перетренировку, и все возвращается на круги своя.

Из полученных результатов можно сделать вывод, что помеха настолько мощная, что "пробивает" и на 33600, и на 26400. Поэтому смысла ограничивать скорость нет.

Кстати, есть предположение о том, почему ZyXEL вешал трубку, когда Вы пытались избавиться от перетренировок. Скорее всего, соединение "оставалось в живых" именно благодаря этим перетренировкам. Не позволяете ретрейниться - и ZyXEL отключается из-за превышения счётчика перепосылок или тайм-аута LAP-M.
_________________
Inpro
Technical Support

[kai666]

Да, похоже что дело все-таки в "шумной" линии. Ну, в любом случае спасибо за ответы, техническая поддержка Инпро - лучшая из всех что я знаю.