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modem shiftingspeed

Hello!

We have a c3640 with 2 NM-30DM=s. There was a lot of errors today. When somebody tried to dialin, after a successfull connect speedshifting started and the line dropped after it. (session timeout 60?)

Modem 2/7 Mica: in modem state CALL_SETUP

Sep 7 13:15:41: Modem 2/7 Mica: in modem state CONNECT

Sep 7 13:15:47: Modem 2/7 Mica: in modem state LINK

Sep 7 13:15:58: Modem 2/7 Mica: in modem state TRAINUP

Sep 7 13:16:04: Modem 2/7 Mica: in modem state EC_NEGOTIATING

Sep 7 13:16:05: Modem 2/7 Mica: in modem state STEADY

Sep 7 13:16:05: Modem 2/7 Mica: CONNECT at 44000/26400 (Tx/Rx), V90, LAPM, V42bis

Sep 7 13:16:08: Modem 2/7 Mica: in modem state SS_SHIFTINGSPEED

Sep 7 13:16:10: Modem 2/7 Mica: in modem state STEADY

Sep 7 13:16:10: Modem 2/7 Mica: SpeedShifted to 42666/26400 (Tx/Rx)

Sep 7 13:16:26: Modem 2/7 Mica: in modem state SS_SHIFTINGSPEED

Sep 7 13:16:28: Modem 2/7 Mica: in modem state STEADY

Sep 7 13:16:28: Modem 2/7 Mica: SpeedShifted to 42666/26400 (Tx/Rx)

Sep 7 13:16:41: Modem 2/7 Mica: in modem state SS_RETRAINING

Sep 7 13:16:54: Modem 2/7 Mica: in modem state TERMINATING

Sep 7 13:16:54: Modem 2/7 Mica: in modem state IDLE

Sep 7 13:16:54: Modem 2/7 Mica: DISCONNECT after 00:01:14, due to reason (0xDF06) DS1 network disconnect (no carrier).

Why is so mutch speed shifting?

This is not a permanent error, after a sort time everything is ok.

It occurs on both isdn30.

Regards,

Bela

1 REPLY
Anonymous
N/A

Re: modem shiftingspeed

Speed Shifting is a common occurrence with modems and is nothing to worry about, the modem's (client and access server) are constantly trying to better the modem speed hence the speed shift up or down. If the modem's detect the line condition has deteriorated the speed will shift down to compensate for it, if the line condition improves the modem's will speed shift up to gain the optimun end to end speed. check out the following link for information on Modem States and Disconnect Reasons :

http://www.cisco.com/en/US/tech/tk801/tk36/technologies_tech_note09186a0080094ebd.shtml

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