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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The PUM_BCM_ALM alarm indicates that the bias current of the pump laser crosses the threshold. This alarm occurs when the pump laser bias current of the optical amplifier unit crosses the threshold.


Alarm Severity Alarm Type


Equipment alarm



Impact on the System

The pump laser may be aged. Report of this alarm has no impact on the services. If no measure is taken, however, the output optical power of the board is affected in a period of time. This affects the services

Possible Causes

  • Excessively high or excessively low ambient temperature affects the laser.

  • The board is faulty.


  1. Check whether the ambient temperature is normal. If not, adjust the ambient temperature of the equipment to a proper degree.
  2. If the alarm persists, perform a warm reset on the faulty board on the NMS. For details, see Resetting Boards in the Supporting Tarks.
  3. If the alarm persists, you can reseat the faulty board if it does not affect the services.
  4. If the alarm persists, replace the faulty board. For details, see Parts Replacement.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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