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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The TF alarm indicates a transmission failure in the laser.


Alarm Severity Alarm Type


Equipment alarm



Impact on the System

When the TF alarm occurs, the transmission of the laser fails. As a result, the services are interrupted.

Possible Causes

The possible cause of the TF alarm is as follows:

  • The laser of the board is aged or faulty.
  • The board is faulty.


  1. Check the optical module of the board to check whether the optical module is aged or faulty.

    If... Then...

    The optical module is aged or faulty

    Replace the optical module. Check whether the alarm is cleared. If the alarm persists, go to the next step.

    The optical module is normal

    Go to the next step.

  2. Replace the board.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

Views: 75091

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