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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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Loss of ODUk TCMn serial connection. The TCM provides the connection monitoring function of the ODUk to cater for different application scenarios. For example, the TCM from optical network node interface (NNI) to optical network node interface (NNI) monitors the connection of the ODUk through the carrier network. This alarm is generated when the serial connection is lost and the STAT byte is "000".

  • 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 TCM is not available.

Possible Causes

The TCM at the peer end is not set as enabled, and there is no TCM source.


  1. On the NMS, find the position that generates this alarm first according to the logical fibers topology.
  2. Query whether the configuration of the position and its peer position is correct. If not, modify the configuration.
  3. 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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