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
clock source internal
pri-group timeslots 1-24
no ip address
isdn switch-type primary-qsig
isdn protocol-emulate network
isdn incoming-voice voice
no cdp enable
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
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...
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.