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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The LP_RDI_VC12 indicates a remote defect in the lower order path of the tributary board.


Alarm Severity Alarm Type


Communication alarm


When you view an alarm on the network management system, select the alarm. In the Alarm Details field display the related parameters of the alarm. The alarm parameters are in the following format: Alarm Parameters (hex): parameter1 parameter2...parameterN. For details about each parameter, refer to the following table.

Name Meaning

Parameter 1

Indicates the logical port number, and the value is always 0x01.

Parameter 2, parameter 3

Indicates the VC-12 path number that generates the alarm.

Impact on the System

When the LP_RDI alarm occurs, the opposite station receives the TU_AIS, TU_LOP, LP_TIM, or LP_UNEQ alarm and then returns the LP_RDI alarm (VC12: V5[b8], VC3: G1[b5]) to the local tributary board.

Possible Causes

The possible cause of the LP_RDI_VC12 alarm is as follows:

  • The opposite station has received the TU_AIS, TU_LOP, LP_TIM, or LP_UNEQ alarm.

  • The receive part at the opposite station is faulty.
  • The transmit part at the local station is faulty.


  1. View alarms of the NE, and check whether there is the TU_AIS or TU_LOP alarm in the corresponding path of the tributary board at the opposite station.
    If... Then...
    There is the TU_AIS, TU_LOP, LP_TIM, or LP_UNEQ alarm Refer to the corresponding section in this document to clear the alarm.
    There are no such alarms as the TU_AIS, TU_LOP, LP_TIM, or LP_UNEQ alarm Proceed to the next step.
  2. If there is no alarm or the corresponding alarm is cleared at the opposite station, the LP_RDI_VC12 alarm persists. The tributary board is faulty. Replace the faulty board.

    Replacing the tributary board will interrupt services. This operation is of risk.

Related Information

Updated: 2019-01-21

Document ID: EDOC1100020975

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