qsig PRI time slips

Answered Question
Nov 12th, 2009

I have a 2651 with a PRI tie line to an Avaya IP office and I see pretty consistent time slips on the T1 controller. The Avaya is clocking off of its PSTN PRI and I am clocking internal. Is there anyway to eliminate the slips entirely? The users are complaining about calls cutting out, and the QOS looks solid so I wanted to check this.

controller T1 0/1

framing esf

clock source internal

linecode b8zs

pri-group timeslots 1-24

interface Serial0/1:23

no ip address

isdn switch-type primary-qsig

isdn protocol-emulate network

isdn incoming-voice voice

no cdp enable

voice-port 0/1:23

show controllers t1 0/1

T1 0/1 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: 20050620, FPGA: 16, spm_count = 0

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

CRC Threshold is 320. Reported from firmware is 320.

Data in current interval (687 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

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

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

I have this problem too.
0 votes
Correct Answer by loucanick about 7 years 2 months ago

With clocking set to Internal, you will be trying to drive clock on that PRI toward the Avaya...if the Avaya is also driving clock, you may see slipping.

If the Avaya is driving the clock, set the clocking to Line on the T1 controller so the timing will be derived from the PRI coming from Avaya...

Correct Answer by emorivera2526 about 7 years 2 months ago

Do you have the following commands in the config:

network-clock-participate wic 0

network-clock-select 1 T1 0/1

If not, try adding them.

Emilio

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Correct Answer
emorivera2526 Thu, 11/12/2009 - 08:22

Do you have the following commands in the config:

network-clock-participate wic 0

network-clock-select 1 T1 0/1

If not, try adding them.

Emilio

Correct Answer
loucanick Thu, 11/12/2009 - 09:42

With clocking set to Internal, you will be trying to drive clock on that PRI toward the Avaya...if the Avaya is also driving clock, you may see slipping.

If the Avaya is driving the clock, set the clocking to Line on the T1 controller so the timing will be derived from the PRI coming from Avaya...

scott.hammond Thu, 11/12/2009 - 09:58

router(config)#network-clock-participate wic 0

WIC slot is empty or does not support clock participate

router(config)#network-clock-select 1 T1 0/1

*** Slot 0 is configured not to participate in System Clocking.

Tried clocking to Line and it did the same thing, in fact the slips were more frequent set to LINE

scott.hammond Thu, 11/12/2009 - 11:03

Duh, had to swizzle the command for my layout and between the participate command and the clocking to line it looks like the slips are gone!

Thanks guys.

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