ATM SPA : clock source

Unanswered Question
May 19th, 2008

Hi !

Currently I am troubleshooting clock issues on ATM SPAs..

Some of them show clock: line and some show clock: internal Reason: S1

But there is no way to set it to "LINE" - only INTERNAL is available.

Could you please help me ? what does Reason: S1 mean ?

and how it`s possible to set it to line.


not configured

COAPS = 0 PSBF = 0

State: PSBF_state = False

Rx(K1/K2): 00/00 Tx(K1/K2): 00/00

Rx Synchronization Status S1 = FF

S1S0 = 02, C2 = 13


BER thresholds: SF = 10e-3 SD = 10e-6

TCA thresholds: B1 = 10e-6 B2 = 10e-6 B3 = 10e-6

Clock source: internal

Clock source changed to : internal Reason : S1



I have this problem too.
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smahbub Fri, 05/23/2008 - 06:57

In order to resolve this issue, configure the router to derive the clock from one source. If the service provider furnishes the clocking, configure all the ports to source the clock from the line. In the case of ATM point-to-point, the service provider will not furnish the clocking. In this case, configure one end to source the clock internally, and configure the other end to source the clock from line.

The url below will help you in troubleshooting clock issues in ATM SPA:


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