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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The APS_FAIL alarm indicates that the multiplex section protection (MSP) switching fails.


Alarm Severity Alarm Type


Communication alarm



Impact on the System

Switching is unavailable for the services under protection, and the services are interrupted.

Possible Causes

Possible causes of this alarm are as follows:

  • The MSP parameter configurations are incorrect.
  • The MSP parameter configurations are lost.


  1. Check whether the MSP parameter configurations of NEs are correct.

    If... Then...

    The MSP parameter configurations are incorrect

    Correct the MSP parameter configurations. Then, check whether the alarm is cleared. If the alarm persists, go to the next step.

    The MSP parameter configurations are correct

    Go to the next step.

  2. Check whether the K byte pass-through and auto-reporting functions are working properly on each NE. If the functions are not working properly on an NE, check the line board of the NE.

    If... Then...

    The line board is faulty

    Replace the related board.

    The line board is functioning properly

    Contact Huawei technical support engineers to handle the alarm.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

Views: 75222

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