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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The LP_RDI alarm indicates a remote receive failure in the lower order path of the tributary board. After receiving the TU_AIS or TU_LOP alarm, the opposite end sends the LP_RDI alarm to the local end.


Alarm Severity Alarm Type


Communication alarm



Impact on the System


Possible Causes

Possible causes of this alarm are as follows:

  • The opposite end receives the TU_AIS or TU_LOP alarm.
  • The receive unit at the opposite end is faulty.
  • The transmit unit at the local end is faulty.


  1. Check whether the TU_AIS or TU_LOP alarm is reported in the corresponding path of the tributary board at the opposite end.

    If... Then...
    The TU_AIS or TU_LOP alarm is reported Clear the TU_AIS or TU_LOP alarm. Then, check whether the LP_RDI alarm is cleared. If the LP_RDI alarm persists, go to the next step.
    The TU_AIS or TU_LOP alarm is not reported Go to the next step.

  2. Replace the faulty board.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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