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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The LP_SLM alarm indicates inconsistent labels of signals in the lower order path. This alarm is generated when a board detects inconsistent V5 or C2 bytes.


Alarm Severity Alarm Type


Communication alarm


When the LP_SLM occurs, the mapping structure of the lower order services received on the tributary board is incorrect. As a result, the services are abnormal (VC-12: V5[b5-b7], VC3: C2).

Impact on the System

This alarm does not have any impact on the system.

Possible Causes

Possible causes of this alarm are as follows:

  • The label of signals in the lower order path at the local end is not consistent with that at the opposite end.
  • The service type is incorrectly configured.


  1. View the LP_SLM alarm on the U2000 to determine the board and path where the LP_SLM alarm is generated.
  2. Ensure that the label of signals in the lower order path at the local end is consistent with that at the opposite end. Then, check whether the alarm is cleared.
  3. If the alarm persists, check whether the service configuration on the board that reports the alarm is correct. After modifying the incorrect configuration, check whether the alarm is cleared.
  4. If the alarm persists, perform a self-loop at the local end to check whether the board at the local or opposite end is faulty. Then, replace the faulty board.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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