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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The LP_UNEQ_VC3 alarm indicates that the VC-3 path is not loaded with signals.


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-3 path number that generates the alarm.

Impact on the System

When the LP_UNEQ_VC3 alarm occurs, no services are loaded in the payload of the lower order path (VC-12: V5 [b5-b7], VC-3: C2) received by the board on the cross-connection side from the opposite station.

Possible Causes

The possible causes of the LP_UNEQ_VC3 alarm are as follows:

  • The lower order path at the opposite station of the SDH transmission equipment is unused.

  • The T_ALOS alarm is reported on the board at the opposite station of the SDH transmission equipment, and the LP_UNEQ_VC3 is enabled to be inserted.


  1. Check whether the lower order path at the opposite station is set unused. If the lower order path is used, go to step 3; If the path is not used, set the path to use.
  2. View alarms on the NMS to check whether the LP_UNEQ_VC3 alarm is cleared.

    If... Then...
    If this alarm is cleared The fault is removed. End the alarm handling.
    If this alarm persists Proceed to the next step.

  3. Check whether the T_ALOS alarm is reported on the board at the opposite station and whether the LP_UNEQ_VC3 is enabled to be inserted. Clear the T_ALOS alarm or disable the LP_UNEQ_VC3 to be inserted.

Related Information

Updated: 2019-01-21

Document ID: EDOC1100020975

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