Статистика

[Maksim]

Здравствуйте, как можно увеличить скорость и стабильность работы? До этого был USR 5630B, соединялся на 44000.


Inpro IDC Modems Diagnostics, Version 1.0.2.33
01.04.2004 9:01:42 - Outbound Call by RemoteAccess
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.24

Time Online.................. 00:11:43
Termination Reason........... LOCAL REQUEST
Tx Rate (Last/Init/Min/Max).. 28800/28800/28800/28800 bps
Rx Rate (Last/Init/Min/Max).. 36000/37333/34667/37333 bps
Modulation................... V.90
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 22
Tx/Power Drop/Rx Level....... 15/3/15
SNR Last/Min/Max............. 34/34/34
Highest Rx/Tx State.......... 65/67
EQM Sum...................... 012D
RBS Pattern.................. 00
Rate Drop.................... 0
Digital Loss................. 2000
Retrains Issued/Granted/Auto. 2/0/2
Renegs Issued/Granted........ 3/1
FForwards/FBacks/Denied...... 1/4/0
Forced FB/FB after FF/MaxREJ. 1/1/7
Last dialed number........... PP7923333
V90 9481834347E4

Negotiation Result (Rx/Tx)... V.90 Issue 1 (asymmetric)/V.34
Symbol Rate (Rx/Tx).......... 8000/3200
Carrier Frequency Hz, Tx..... 1829
EQM Value (Last/Min/Max)..... 22/18/127
EQM Hits..................... 0
EQM Last 10 Readings......... 29 27 25 26 36 28 30 25 25 26
Last Retrain/Reneg Status.... Local Fast Retrain
Last Retrain/Reneg Reason.... Local Fallback due to High EQM
Last Retrain/Reneg Time...... 4 minutes ago
Handshake Time/Retries....... 25 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....... 6
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 9,4
Last Rx/Tx State............. 65/67
Energy at 3750Hz/Average .... 5018/2374
Auto Gain Amplitude, db...... 10
AGC Gain (Last/Min/Max)...... 100/100/100
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... 0,0
V.90 Optimal Speed........... 37333 bps (Reg.S120=8)
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...... External
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.. 1/104
Frames Errors, Rx/Tx......... 104/0 (0,6%/0,0%)
Frames Count, Rx/Tx.......... 18644/3465
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 0
Error Control Link NAKs...... 0
Compression Dictionary Size.. V.42bis (2048)
Characters Received.......... 2 163 647
Characters Sent.............. 50 375
Average CPS, Rx/Tx........... 3077/71
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 49


Inpro IDC Modems Diagnostics, Version 1.0.2.33
01.04.2004 9:22:55 - Outbound Call by RemoteAccess
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.24

Time Online.................. 00:12:31
Termination Reason........... LOCAL REQUEST
Tx Rate (Last/Init/Min/Max).. 28800/28800/26400/31200 bps
Rx Rate (Last/Init/Min/Max).. 38667/37333/37333/40000 bps
Modulation................... V.90
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 28
Tx/Power Drop/Rx Level....... 15/1/19
SNR Last/Min/Max............. 34/32/36
Highest Rx/Tx State.......... 67/87
EQM Sum...................... 0109
RBS Pattern.................. 00
Rate Drop.................... 0
Digital Loss................. 2000
Retrains Issued/Granted/Auto. 0/0/2
Renegs Issued/Granted........ 6/0
FForwards/FBacks/Denied...... 4/2/0
Forced FB/FB after FF/MaxREJ. 0/0/5
Last dialed number........... PP7923333
V90 9481834347EB

Negotiation Result (Rx/Tx)... V.90 Issue 1 (asymmetric)/V.34
Symbol Rate (Rx/Tx).......... 8000/3200
Carrier Frequency Hz, Tx..... 1829
EQM Value (Last/Min/Max)..... 28/18/127
EQM Hits..................... 0
EQM Last 10 Readings......... 28 29 26 31 29 24 28 27 25 24
Last Retrain/Reneg Status.... Local Fast Retrain
Last Retrain/Reneg Reason.... Local Fallforward due to Low EQM
Last Retrain/Reneg Time...... 2 minutes ago
Handshake Time/Retries....... 26 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....... 0
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 5,7
Last Rx/Tx State............. 67/87
Energy at 3750Hz/Average .... 2163/1057
Auto Gain Amplitude, db...... 10
AGC Gain (Last/Min/Max)...... 89/89/89
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... 0,0
V.90 Optimal Speed........... 37333 bps (Reg.S120=8)
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...... Unknown
Error Correction Status Byte. SYNC UA:R SAMBE:T XID:T XID:R
Frames REJected, Last/Total.. 1/76
Frames Errors, Rx/Tx......... 76/1 (0,3%/0,0%)
Frames Count, Rx/Tx.......... 21892/3642
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 5
Error Control Link NAKs...... 1
Compression Dictionary Size.. V.42bis (2048)
Characters Received.......... 2 694 618
Characters Sent.............. 85 447
Average CPS, Rx/Tx........... 3588/113
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 53

[Technical Support]

Начальную скорость можно повысить, уменьшив значение регистра S17 (увеличив агрессивность модема). Дополнительно, обнуляйте S120 в строке инициализации. Однако, всё это не приведёт к увеличению производительности модема - скорость вскоре будет понижена и стабилизируется примерно на уровне 37333..38667 бит/с.

Причина - в НЧ помехах:

Detection of 120 Hz Tones.... Yes

источником которых, возможно, является незаземлённый компьютер или телефонный аппарат, включённый параллельно с модемом. Поэтому правильнее всего начать с заземления компьютера (если это возможно) и отключения (для проверки влияния) параллельных телефонов.

В строку инициализации (в свойствах модема) впишите команды:

S91=15 S210.7=1 S120=0 S17=64
_________________
Inpro
Technical Support

[Maksim]

Очень приятно, что так быстро ответили. После добавления S91=15 S210.7=1 S120=0 S17=64 :

Inpro IDC Modems Diagnostics, Version 1.0.2.33
01.04.2004 10:51:51 - Outbound Call by RemoteAccess
--------------------------------------------------------
Modem type: IDC-5614BXL/VR+ (Plus) Firmware revision: V2.24

Time Online.................. 00:16:38
Termination Reason........... LOCAL REQUEST
Tx Rate (Last/Init/Min/Max).. 28800/28800/28800/31200 bps
Rx Rate (Last/Init/Min/Max).. 37333/40000/36000/42667 bps
Modulation................... V.90
Protocol/Compression......... LAP-M/V.42bis
Line Quality................. 25
Tx/Power Drop/Rx Level....... 15/0/16
SNR Last/Min/Max............. 36/34/36
Highest Rx/Tx State.......... 67/87
EQM Sum...................... 00EE
RBS Pattern.................. 00
Rate Drop.................... 0
Digital Loss................. 2000
Retrains Issued/Granted/Auto. 3/0/2
Renegs Issued/Granted........ 4/0
FForwards/FBacks/Denied...... 1/6/0
Forced FB/FB after FF/MaxREJ. 1/0/7
Last dialed number........... PP7923333
V90 9481834347EB

Negotiation Result (Rx/Tx)... V.90 Issue 1 (asymmetric)/V.34
Symbol Rate (Rx/Tx).......... 8000/3200
Carrier Frequency Hz, Tx..... 1829
EQM Value (Last/Min/Max)..... 25/17/127
EQM Hits..................... 0
EQM Last 10 Readings......... 27 22 28 27 24 30 26 24 24 23
Last Retrain/Reneg Status.... Local Fast Retrain
Last Retrain/Reneg Reason.... Local Fallforward due to Low EQM
Last Retrain/Reneg Time...... 3 minutes ago
Handshake Time/Retries....... 26 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....... 0
Band Edges Lower/Upper, Hz... 150/3825
Round trip delay, ms......... 4,8
Last Rx/Tx State............. 67/87
Energy at 3750Hz/Average .... 4762/2395
Auto Gain Amplitude, db...... 10
AGC Gain (Last/Min/Max)...... 99/99/99
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... 0,0
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...... Unknown
Error Correction Status Byte. SYNC UA:R SAMBE:T XID:T XID:R
Frames REJected, Last/Total.. 1/90
Frames Errors, Rx/Tx......... 90/3 (0,4%/0,1%)
Frames Count, Rx/Tx.......... 25341/5413
Error Control Frame Size..... V.42 LAPM (128)
Error Control Timeouts....... 0
Error Control Link NAKs...... 3
Compression Dictionary Size.. V.42bis (2048)
Characters Received.......... 3 497 322
Characters Sent.............. 254 105
Average CPS, Rx/Tx........... 3504/254
Characters Lost, Rx/Tx....... 0/0
Estimated Noise Level, -dBm.. 52

Но почему-то модем устанавливает связь без «сжатия», хотя по «умолчанию» сжатие работало и еще во время скачивания периодически бывают паузы 0.5- 1минуты?

[Technical Support]

В общем-то, всё происходит так, как обещали: начальная скорость возросла, производительности это не добавило, после нескольких перетренировок "застабилизировались" на уровне 37333.

Пока не избавитесь от помех, это - предел возможностей. Если избавиться не удастся, то лучше всего просто ограничить скорость до 38667, дописав в конец строки инициализации команду:

+MS=,,,38667

[Maksim]

Спасибо