E1 freezes over time

Unanswered Question
Apr 8th, 2009


The E1 connection will "sometimes' freeze for no obvious reason. Once a month, then maybe 2 times a week, then nothing for 2 months. There is no pattern in this freezes. I have configured everything correct. I have used this setup with the same provider in the same country for other customers where it works without errors.

I have changed everthing on the customers side: voice gateway, IOS, cabling. The provider also has changed everything on their side.

The problem still is there, all the swaps did not solve the problem. I'm running out of ideas.

As you can see, there are some errors.

Does anybody has an idea on what to do next? The provider will tell me next time that he can not do anything else. The customer begins to wonder...

E1 0/3/0 is up.

Applique type is Channelized E1 - balanced

Cablelength is Unknown

No alarms detected.

alarm-trigger is not set

Version info Firmware: 20071011, FPGA: 13, spm_count = 0

Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.

CRC Threshold is 320. Reported from firmware is 320.

Data in current interval (856 seconds elapsed):

3 Line Code Violations, 13 Path Code Violations

0 Slip Secs, 0 Fr Loss Secs, 1 Line Err Secs, 0 Degraded Mins

1 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 6 Unavail Secs

Total Data (last 24 hours)

0 Line Code Violations, 0 Path Code Violations,

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs


Serial0/3/0:15 is up, line protocol is up (spoofing)

Hardware is DSX1

MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation HDLC, loopback not set

Last input 00:00:01, output 00:00:01, output hang never

Last clearing of "show interface" counters 2d04h

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/1/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 48 kilobits/sec

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

36516 packets input, 664656 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

1 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored, 1 abort

34326 packets output, 200000 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 unknown protocol drops

0 output buffer failures, 0 output buffers swapped out

4 carrier transitions

I have this problem too.
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Paolo Bevilacqua Wed, 04/08/2009 - 01:45

Can you provide a show controllers E1 when the problem happens ?

Which exact IOS are you using ?

MGCP or H.323 ?

woutereelen Wed, 04/08/2009 - 02:10

IOS: c2801-spservicesk9-mz.124-21.bin

It's configured as an H.323 gateway.

Paolo Bevilacqua Wed, 04/08/2009 - 02:36

Recommend you try 12.4(3j) that is known as the most stable.

Beside that, you would need to collect a bunch of info when the problem occurs, and work it with the TAC.


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