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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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ODUk TCMn alarm indication signal. An AIS signal is transmitted to the downstream, indicating that a signal is failed in the upstream. The alarm is generated when the STAT byte value is "111".

  • 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

  • Signals input from the client side contain the ODUk_TCMn_AIS signal.

  • The corresponding board at the peer end transmits the ODUk_TCMn_AIS signals.

  • The loopback or cross-connection is set at the upstream station, and the FEC type is incorrectly configured.


  1. On the NMS, query whether there is any OTUk-level alarm on the board. If there is, handle the alarm.
  2. Query whether the alarm is reported from the client side. If it is, check the equipment on the client side.
  3. On the NMS, query whether the ODUk_TCMn_AIS, R_LOS, or R_LOF, alarm exists on the client side of the board at the peer end. If the alarm exists, check the equipment at the peer end.
  4. On the NMS, query whether the loopback is set on the upstream station. If it is, release the loopback of the upstream station.
  5. Check whether the configuration of the cross-connection and FEC type at the upstream station is correct. If the configuration is incorrect, modify the configuration.
  6. 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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