новая прошивка от 20.01

[Vlad]

уже второй раз замечаю падение скорости с 53k до 44k:

Inpro IDC 2814/5614 BXL/VR Diagnostics, Version 1.0.1.30
30.01.2003 2:32:37 - Outbound Call by RemoteAccess
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.23

Time Online.................. 00:38:35
Termination Reason........... LOCAL REQUEST
Tx Rate (Last/Init/Min/Max).. 28800/28800/28800/28800 bps
Rx Rate (Last/Init/Min/Max).. 44000/53333/44000/53333 bps
Modulation................... V.90
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 25
Tx/Power Drop/Rx Level....... 15/1/15
SNR Last/Min/Max............. 43/43/43
Highest Rx/Tx State.......... 67/67
EQM Sum...................... 007C
RBS Pattern.................. 00
Rate Drop.................... 2
Digital Loss................. 235F
Retrains Issued/Granted/Auto. 1/0/0
Renegs Issued/Granted........ 0/0
FForwards/FBacks/Denied...... 0/1/0
Forced FB/FB after FF/MaxREJ. 0/0/5
Last dialed number........... T7454045
V90 9481834347EB

Symbol Rate.................. 3200
Carrier Frequency Hz, Tx..... 1829
EQM Value (Last/Min/Max)..... 25/5/127
EQM Hits..................... 0
EQM Last 10 Readings......... 25 29 23 26 26 26 25 25 23 24
Last Retrain/Reneg Status.... Local Retrain
Last Retrain/Reneg Reason.... Local Fallback due to High EQM
Last Retrain/Reneg Time...... 38 minutes ago
Handshake Time/Retries....... 23 seconds/0
Non-linear Encoding, Rx/Tx... OFF/ON
Precoding, Rx/Tx............. OFF/ON
Shaping, Rx/Tx............... OFF/ON
Trellis Encoding, Tx......... 16 state
Pre-Emphasis Index, Tx....... 1
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 5,1
Last Rx/Tx State............. 67/67
Energy at 3750Hz/Average .... 2315/1749
Auto Gain Amplitude, db...... 10
Detection of 120 Hz Tones.... Yes
Detection of Dual PCM........ No
V.90 RBS Pattern............. 00
V.90 Alternating RBS Pattern. 00
V.90 Digital Pad Value, db... 0,9
V.90 Optimal Speed........... No Limit (Reg.S120=0)
V.8 Negotiation Started...... Yes
V.8bis Success............... Yes
V.8bis CRe,CRd,CL,MS,ACK,NAK. Yes/No/Yes/No/Yes/No
Remote Manufacturer.......... Rockwell (Conexant)
Remote Licensee Code......... Rockwell (Conexant)
Remote Protocol Support...... K56flex V.90
Remote K56flex Version....... 03
Remote K56flex Capabilities.. Prototype mode is not supported
Remote Type.................. Server (Digital)
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. SYNC UA:R SAMBE:T XID:T XID:R
Frames REJected, Last/Total.. 1/9
Frames Errors, Rx/Tx......... 9/0 (0,0%/0,0%)
Frames Count, Rx/Tx.......... 35218/11849
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 11
Error Control Link NAKs...... 0
Compression Dictionary Size.. V.42bis (2048)
Characters Received.......... 6576743
Characters Sent.............. 1287523
Average CPS, Rx/Tx........... 2840/556
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 58

Есть ли очевидное объяснение сему факту?

[Peter Stoliarov]

Почти в самом начале сеанса модем учуял снижение качества линии, попросил ретрейн, и в процессе ретрейна обнаружил низкочастотные помехи.
Detection of 120 Hz Tones.... Yes
При их наличии больше 44000 бит/с добиться невозможно

[Technical Support]

Диагноз совпадает с Peter Stoliarov. Вопрос в том, что происходит в других сеансах... Вы не могли бы заархивировать журнал целиком и прислать на support@inpro.us.com? Если можно, с Вашими комментариями о том, когда была обновлена версия микропрограммы.
_________________
Inpro
Technical Support

[Vlad]

Новая прошивка от 31.01.03 оказалась отличным лекарством для лечения упомянутой проблемы. Благодарю службу технической поддержки за оперативную работу!

Так работает новая прошивка:

Inpro IDC Modems Diagnostics, Version 1.0.1.30
01.02.2003 2:32:35 - Outbound Call by RemoteAccess
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.23

Time Online.................. 00:17:58
Termination Reason........... LOCAL REQUEST
Tx Rate (Last/Init/Min/Max).. 26400/28800/26400/28800 bps
Rx Rate (Last/Init/Min/Max).. 53333/53333/44000/54667 bps
Modulation................... V.90
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 127
Tx/Power Drop/Rx Level....... 15/1/15
SNR Last/Min/Max............. 39/39/43
Highest Rx/Tx State.......... 67/87
EQM Sum...................... 0067
RBS Pattern.................. 00
Rate Drop.................... 2
Digital Loss................. 235F
Retrains Issued/Granted/Auto. 1/0/2
Renegs Issued/Granted........ 15/0
FForwards/FBacks/Denied...... 8/8/0
Forced FB/FB after FF/MaxREJ. 5/4/9
Last dialed number........... T7454045
V90 9481834246E0


Symbol Rate.................. 3200
Carrier Frequency Hz, Tx..... 1829
EQM Value (Last/Min/Max)..... 127/8/127
EQM Hits..................... 0
EQM Last 10 Readings......... 124 126 127 126 124 126 27 26 26 23
Last Retrain/Reneg Status.... Local Fast Retrain
Last Retrain/Reneg Reason.... Local Fallback due to High EQM
Last Retrain/Reneg Time...... 0 minutes ago
Handshake Time/Retries....... 22 seconds/0
Non-linear Encoding, Rx/Tx... OFF/OFF
Precoding, Rx/Tx............. OFF/OFF
Shaping, Rx/Tx............... OFF/OFF
Trellis Encoding, Tx......... 16 state
Pre-Emphasis Index, Tx....... 6
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 5,1
Last Rx/Tx State............. 65/67
Energy at 3750Hz/Average .... 9327/3890
Auto Gain Amplitude, db...... 10
Detection of 120 Hz Tones.... No
Detection of Dual PCM........ No
V.90 RBS Pattern............. 00
V.90 Alternating RBS Pattern. 00
V.90 Digital Pad Value, db... 0,9
V.90 Optimal Speed........... No Limit (Reg.S120=0)
V.8 Negotiation Started...... Yes
V.8bis Success............... Yes
V.8bis CRe,CRd,CL,MS,ACK,NAK. Yes/No/Yes/No/Yes/No
Remote Manufacturer.......... Rockwell (Conexant)
Remote Licensee Code......... Rockwell (Conexant)
Remote Protocol Support...... K56flex V.90
Remote K56flex Version....... 02
Remote K56flex Capabilities.. Prototype mode is not supported
Remote Type.................. Server (Digital)
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...... External
Workaround Used.............. Rate Reneg Failure (At 64 or 84)
Error Correction Status Byte. SYNC UA:R SAMBE:T XID:T XID:R
Frames REJected, Last/Total.. 1/30
Frames Errors, Rx/Tx......... 286/1 (0,8%/0,0%)
Frames Count, Rx/Tx.......... 36184/6755
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 0
Error Control Link NAKs...... 1
Compression Dictionary Size.. V.42bis (2048)
Characters Received.......... 4533429
Characters Sent.............. 296096
Average CPS, Rx/Tx........... 4205/274
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 54