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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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ODUk TCMn signal being locked. The maintenance signal LCK byte required by the carrier is used to lock the access point signal of users during testing. It can be generated when the server layer adapts the source and sink. The alarm is generated when the STAT byte value is "101" during locking.

  • k indicates the level of rate, its value is 0, 1, or 2.
  • n indicates the level of TCM, its value ranges from 1 to 6.


Alarm Severity Alarm Type


Communication alarm



Impact on the System

If the alarm is generated, the services carried at the optical port are unavailable.

Possible Causes

The current line signals are being tested.


  1. On the NMS, query and locate the slot ID, port ID, and channel ID of the board that generates this alarm.
  2. Set the LCK type to Disabled if it is Enabled.
  3. If the alarm persists, contact Huawei technical support engineers to handle the alarm.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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