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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The LCAS_FOPR is an alarm indicating the protocol failure in the LCAS receive direction.


Alarm Severity Alarm Type


Processing 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 optical interface number. The value is always 0x01.

Parameter 2, Parameter 3

Indicates the VCTRUNK port number.

Impact on the System

The LCAS protection does not work.

Possible Causes

The possible causes of the LCAS_FOPR alarm are as follows:

  • The downlink VCG receives SQ repeatedly due to incorrect configuration or link bit errors.

  • The LCAS function of the opposite VCG is disabled.
  • The downlink VCG simultaneously receives the FIXED and other LCAS control bytes due to incorrect configuration or bit errors in the link.


  1. Check the service configurations of the local and opposite station. Check whether the bound timeslots of the VCTRUNK are consistent. If any error exists, reconfigure the values.
  2. Check whether the LCAS is enabled at the opposite station. If not, enable the LCAS.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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