The A_LOC on Huawei Optix OSN2500 is an alarm indicating the loss of clock in the upstream direction of the bus.
Parameters
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.
Impact on the System
When the A_LOC alarm occurs, the services carried by the board path are interrupted.
Possible Causes
The possible causes of the A_LOC alarm are as follows:
The PDH equipment interconnected to the service path is faulty.
The service type is incorrectly configured.
The service cross-connection is incorrectly configured.
The board hardware is faulty.
The cross-connect and timing board is faulty.
Procedure
Step 1 Check whether Huawei PDH equipment interconnected to the service path is faulty. If yes, take priority to remove the fault, and then check whether the A_LOC alarm is cleared.
Step 2 View the A_LOC alarm on the U2000, and then confirm the path number according to the alarm parameters.
Step 3 Check whether the service configuration of the path is correct. Make sure that the service type
at the local end is consistent with that at the remote end, and the cross-connection is correctly
configured. Then check whether the A_LOC alarm is cleared.
Step 4 If the alarm persists, check whether any hardware of the board that reports the A_LOC alarm is faulty on the U2000. If yes, perform a cold reset on the board. Then check whether the A_LOC
alarm is cleared.
Step 5 If the alarm persists, replace the board.
Step 6 If the alarm persists, perform a cold reset on the cross-connect and timing board. Then check
whether the A_LOC alarm is cleared.
Step 7 If the alarm persists, check whether the cross-connect and timing board is faulty. If yes, replace the cross-connect and timing board. Then the A_LOC alarm is automatically cleared.
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