I am getting Slip seconds and error seconds on one of the PRI.

[Rakesh Shukla]

sh controller t1
T1 0/0/0 is up.
  Applique type is Channelized T1
  Cablelength is long 0db
   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 FPGA Rev: 08121917, FPGA Type: PRK4
  Framing is ESF, Line Code is B8ZS, Clock Source is Line.
  CRC Threshold is 320. Reported from firmware  is 320.
  Data in current interval (377 seconds elapsed):
     0 Line Code Violations, 0 Path Code Violations
     81 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     81 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Total Data (last 1 15 minute intervals):
     0 Line Code Violations, 0 Path Code Violations,
     193 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
     193 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Sec

[Mohammed al Baqari]

Can you make sure that the line code is matching the one configured by your upstream provider

[Jonathan Schulenberg]

Unless you're on an ISR 4300/4400 where the DSPs are daughter cards per-NIM, also be aware of the clocking domain limitations.

http://www.cisco.com/c/en/us/support/docs/wan/tdm/116050-trouble-tdm-clocking-00.html

If the ISDN PRIs are from multiple providers, or even the same provider but connected to different C.O. equipment, they may not share the same clock source.

[Dalton-Covene]

Hi Rakesh,

As others mentioned this is almost certainly a clocking issue. Were you able to get this resolved?

Are there multiple PRIs? 

If so, are all of the PRIs taking Slips & Errored Secs or just one of the PRIs? 

What model of router?

Regards,

Dalton Woolsey