[cisco-voip] Slip Errors on our Routers

[Ellington, Chris]

FAXing, in particular, doesn't tolerate slips at all, so I'm not
surprised that it's not working.  Usually you will hear pops and
crackling on the line with slips too.  You will want to set the clock to
come from one of the VWICs, for sure and you've nailed the commands to
do so.

 

chris

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Jeff Ruttman
Sent: Friday, October 03, 2008 11:22 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Slip Errors on our Routers

 

Greetings, 

 

We're getting some QoS complaints and lots of trouble faxing via an ATA.

 

I'm definitely not a router guy, but I'm trying to do some research.
It's my understanding that too many slip errors cause static and
choppiness.  And maybe even echo?

 

I don't know how many slip errors are "too many," but I'm thinking we've
surpassed that threshold.

 

We have this kind of line in our config:  network-clock-participate slot
x (pointing to the vwic).

 

I'm reading that we might need this set as well:  network-clock-select x
E1 x/x/x.  I haven't been able to see a line like that in our config.

 

Any comments?

 

The PRI at one of our sites is on this router interface: 

 

T1 0/3/1 is up. 

  Applique type is Channelized T1 

  Cablelength is long gain36 0db 

  Description: PRI xxxxxxx 

  No alarms detected. 

  alarm-trigger is not set 

  Soaking time: 3, Clearance time: 10 

  AIS State:Clear  LOS State:Clear  LOF State:Clear 

  Version info Firmware: 20060707, FPGA: 13, spm_count = 0 

  Framing is ESF, Line Code is B8ZS, Clock Source is Line. 

  CRC Threshold is 320. Reported from firmware  is 320. 

  Data in current interval (554 seconds elapsed): 

     0 Line Code Violations, 0 Path Code Violations 

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

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

  Total Data (last 24 hours) 

     0 Line Code Violations, 0 Path Code Violations, 

     8325 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins, 

     8325 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0
Unavail Secs 

 

 

Thanks

jeff 

 

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