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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The SYN_BAD alarm indicates that the current synchronization clock source of the clock board is degraded.


Alarm Severity Alarm Type


Equipment alarm



Impact on the System

When the SYN_BAD alarm occurs, the current synchronization clock source of the clock board is degraded. As a result, system service transmission and receiving are affected.

Possible Causes

The possible cause of the SYN_BAD alarm is as follows:

  • The quality of the traced synchronization clock source is degraded.


  1. Check whether there are bit error and pointer justification performance events in the direction of the traced clock source. Handle them as a result.

    If... Then...
    There are B1 bit error, B2 bit error, and pointer justification performance events See the corresponding section in this document to clear the event.
    There is no performance event. Go to the next step.

  2. Check the clock source tracing setting. Prevent the clock tracing loop when configuring the clock tracing.

Related Information

Updated: 2019-01-21

Document ID: EDOC1100020975

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