slips and sec errors on our PRI

Unanswered Question
Jun 13th, 2007

I have been going back and forth with the service provider. We have a PRI handling off net calls which gets roughly 1 slip and 1 sec error every 30 seconds. This is causing echo and dropped calls. Attached is a copy of the PRI config any ideas would be greatly appreciated.

controller T1 0/0/0

framing esf

linecode b8zs

Clock source line

pri-group timeslots 1-24 service mgcp

description POTS T1

I have this problem too.
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Chris Deren Wed, 06/13/2007 - 10:08

Do you have the following commands on your router:

network-clock-participate wic 0

network-clock-select 1 T1 0/0/0


lfulgenzi Wed, 06/13/2007 - 10:18

I currently see a whole slew of time slips as well, but wasn't sure it was because I was crossconnected from a 1MFT-T1/E1 on a 3845 to a 6608 port. It works and there doesn't see to be any issues.

I don't have the network-clock-select statement, but I'm wondering which one I choose and will the "ccm-manager config" statement overwrite this?

It seems like a crapshoot, i.e. no documentation, on which things are overwritten with the "ccm-manager config" statement.

I'll be eventually connecting this to a PSTN in the next few weeks and would like to fix this sooner than later.

lfulgenzi Wed, 06/13/2007 - 10:26


I'm getting a slip EVERY second....beat ya. ;)

vgw-kemptville#show controllers T1 0/0/0 brief

T1 0/0/0 is up.

Applique type is Channelized T1

Cablelength is long gain36 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 Firmware: 20060711, 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 (20 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

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

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

248SHaune Wed, 06/13/2007 - 10:39

Ive tried to enter those commands both the will not work on our 2611

lfulgenzi Wed, 06/13/2007 - 10:41

They are global-config commands by the way....just in case you tried entering them on the T1 controller.

248SHaune Thu, 06/14/2007 - 07:51

Thanks Chris you where right I was trying to enter the commands on the controller. I'm going to monitor the controller and update the forum. What do these commands do?


248SHaune Thu, 06/14/2007 - 08:07


Since I have added the commands you requested there have been no I repeat not a single slip. I'm going to have to explain to magnt the function of the two commands and suggest the be used in future employments.

network-clock-participate wic 0

network-clock-select 1 T1 0/0/0



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