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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The LP_REI_VC12 is an alarm indicating a remote bit error in the lower order path of the tributary board.


Alarm Severity Alarm Type


Service quality 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_REI_VC12 alarm occurs, the lower order background block error (BBE) occurs in the received services at the opposite end and the LP_REI alarm (VC12: V5[b3], VC3: G1[b1-b4]) is returned to the local end.

Possible Causes

The possible cause of the LP_REI_VC12 alarm is as follows:

  • Bit errors are received in the lower order path at the opposite end.


  1. View alarms of the opposite NE, and check whether there is the B3 or BIP bit error alarm.
    If... Then...
    There is the B3 or BIP bit error alarm Refer to the corresponding section in this document to clear the B3_EXC, B3_SD, BIP_EXC, or BIP_SD alarm.
    There is no B3 or BIP bit error alarm Proceed to the next step.
  2. Check whether the equipment is securely grounded and whether there is intense interference source around the equipment. If few B3 or BIP bit errors occur in the remote, the fault usually lies in the equipment instead of the optical path. If any interference source exists near the equipment, change the location.
  3. Perform the loopback at two ends of the line. Check whether the cross-connect and timing unit and the tributary board on both the opposite equipment and local equipment operate normally. Following the service direction, check upstream stations one by one. Locate the faulty board.
    If... Then...
    There is the B3 or BIP bit error reported on the opposite board The receive end at the opposite end is faulty. Replace the boards in an order of tributary board, line board, and SCC board.
    There is the B3 or BIP bit error reported on the local board The transmit end of the board at the local end 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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