Скатывание до 9600

[Eralex]

После ~1 минуты в инете скорость уменьшается до 9600.

Моя сторока инициализации:
ATM5S210.7=1S55.3=1+MS=11,,,31200,,,21600
Вот статистика:

Inpro IDC Modems Diagnostics, Version 1.0.1.31
17.04.2005 19:50:46 - Direct Log Write Entry
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.25

Time Online.................. 00:20:13
Termination Reason........... LOCAL REQUEST
Tx Rate (Last/Init/Min/Max).. 21600/21600/21600/21600 bps
Rx Rate (Last/Init/Min/Max).. 9600/31200/ 9600/31200 bps
Modulation................... V.34bis
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 0
Tx/Power Drop/Rx Level....... 9/0/21
SNR Last/Min/Max............. 43/43/43
Highest Rx/Tx State.......... 85/87
EQM Sum...................... 0026
RBS Pattern.................. NA
Rate Drop.................... NA
Digital Loss................. None
Retrains Issued/Granted/Auto. 1/0/0
Renegs Issued/Granted........ 5/0
FForwards/FBacks/Denied...... 1/5/0
Forced FB/FB after FF/MaxREJ. 5/5/10
Last dialed number........... P490111
Flex fail


Symbol Rate.................. 3429
Carrier Frequency Hz, Rx/Tx.. 1959/1959
EQM Value (Last/Min/Max)..... 0/0/26
EQM Hits..................... 0
EQM Last 10 Readings......... 0 0 0 0 0 0 0 0 0 0
Last Retrain/Reneg Status.... Local Rate Renegotiation
Last Retrain/Reneg Reason.... Local Fallback due to High EQM
Last Retrain/Reneg Time...... 14 minutes ago
Handshake Time/Retries....... 22 seconds/0
Non-linear Encoding, Rx/Tx... OFF/ON
Precoding, Rx/Tx............. ON/ON
Shaping, Rx/Tx............... ON/ON
Trellis Encoding, Tx......... 16 state
Pre-Emphasis Index, Tx....... 0
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 8,4
Last Rx/Tx State............. 85/87
Energy at 3750Hz/Average .... 11818/2718
Last AGC Gain Value.......... 85
Minimum AGC Gain Value....... 85
Maximum AGC Gain Value....... 85
V.8 Negotiation Started...... Yes
V.8bis Success............... Yes
V.8bis CRe,CRd,CL,MS,ACK,NAK. Yes/No/Yes/No/Yes/No
Remote supports Symbol Rates. 2743 2800 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:R ODP:T
Error Correction Status Byte. SYNC UA:R SAMBE:T XID:T XID:R
Frames REJected, Last/Total.. 1/34
Frames Errors, Rx/Tx......... 290/35 (2,2%/0,6%)
Frames Count, Rx/Tx.......... 13130/5765
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 11
Error Control Link NAKs...... 35
Compression Dictionary Size.. V.42bis (2048)
Characters Received.......... 1483096
Characters Sent.............. 266168
Average CPS, Rx/Tx........... 1222/219
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 64

[Technical Support]

Причина понятна - Ваш модем снижает скорость из-за высокого процента сбойных кадров на приёме (т.н. "forced fall-back").

Бороться с этим можно только одним способом: запретить снижать скорость (S210.4=1) и подобрать ограничение скорости приёма таким, при котором получается наибольшая производительность. Это ограничение у Вас сейчас стоит в 31200, подбирайте методом "деления отрезка пополам".
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Inpro
Technical Support