Increasing Slip Secs on New 2801

Answered Question
Sep 20th, 2009
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I just swapped out my VG200 for a 2801 for our voice gateway. I've noticed that our slip secs are steadly increasing. Have I missed something in my configuration. Any help would be appreciated.


network-clock-participate wic 3

isdn switch-type primary-dms100


controller T1 0/3/0

framing esf

linecode b8zs

cablelength short 110

pri-group timeslots 1-24


interface Serial0/3/0:23

no ip address

encapsulation hdlc

no ip route-cache cef

no ip route-cache

no logging event link-status

isdn switch-type primary-dms100

isdn incoming-voice voice

isdn bchan-number-order ascending


show controllers t1

T1 0/3/0 is up.

Applique type is Channelized T1

Cablelength is short 110

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: 20080918, 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 (595 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

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

337 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,

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

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

Correct Answer by paolo bevilacqua about 7 years 10 months ago

Just configure

network-clock-select 1 t1 0/3/0


BTW these commands:

encapsulation hdlc

no ip route-cache cef

no ip route-cache


are not necessary and do not have any effect.

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Correct Answer
paolo bevilacqua Sun, 09/20/2009 - 10:58
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Just configure

network-clock-select 1 t1 0/3/0


BTW these commands:

encapsulation hdlc

no ip route-cache cef

no ip route-cache


are not necessary and do not have any effect.

j-foote Sun, 09/20/2009 - 11:19
User Badges:

Thanks for the quick response, solved my problem.


sh controllers t1

T1 0/3/0 is up.

Applique type is Channelized T1

Cablelength is short 110

Description: Serial0/3/0:23 to SBC Pri

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: 20080918, 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 (247 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

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

0 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,

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

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


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