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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The PWAPS_TYPE_MISMATCH alarm indicates that the local NE and the opposite NE are configured with different PW protection types. This alarm is reported when the PW protection type indicated in the received automatic protection switching (APS) frame is different from that specified on the local NE.


Alarm Severity Alarm Type


Communication alarm



Impact on the System

Service protection may fail.

Possible Causes

Possible causes of the PWAPS_TYPE_MISMATCH alarm are as follows:

  • The protection mode is different.
  • The switching mode is different.
  • The revertive mode is different.


  1. On the U2000, check whether the PW APS protection group settings (for example, protection mode, switching mode, and revertive mode) at the local and opposite ends are consistent.
    If... Then...

    Some parameter values are inconsistent

    Modify the settings of PW APS protection groups to make settings at both ends consistent. Enable the PW APS protocol and check whether the alarm is cleared. If the alarm persists, go to the next step.

    All parameter values are consistent

    Go to the next step.

  2. If the alarm persists, contact Huawei technical support engineers to handle the alarm.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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