20125 GESW Back Trunk Group Link Failure

Description

All the backplane links in one trunk group between the GSCU and the service boards are disconnected.

Attribute

Alarm ID	Alarm Severity	Alarm Type
20125	Major	Fault

Parameters

ID	Name	Meaning
1	Subrack No.	Subrack No.
2	Slot No.	Slot No.
3	Cpu No.	CPU No.
4	Trunk Group No.	Number of the trunk group
5	The slot No. of transaction board in this group	Slot No. of the peer service board
6	Alarm Attribute	0=Normal, Alarms period are longer than the Transient Threshold. 1=Transient Count, The times and the period of the alarms whose periods are shorter than the Transient Threshold are summed up. If the sum result is longer than the Alarm Occurrence Period Threshold or Alarm Occurrence Times Threshold, an alarm so called Transient Count Alarm is triggered. Because Transient Count Alarm is based on accumulative result, the recovery of the alarm may occur at least one Summing Cycle later. The Summing Cycle can be query by MML "LST STATSLDWIN".

Impact on the System

The services between the GSCU and the service boards may be disrupted.

System Actions

None.

Possible Causes

The local GSCU or the service board that corresponds to the trunk group is not securely inserted.
The service board corresponding to the trunk group is removed.
The hardware of the board is faulty.
The backplane is faulty.

Procedure

Check whether a correlated parent alarm is reported.
Y => Clear the parent alarm according to the corresponding handling suggestions. Check whether the alarm is cleared .

N => Go to 2.

Correlated parent alarm

20128 Faulty GE Link on the Backplane of GSCU board

This alarm is generated only when the 20128 Faulty GE Link on the Backplane alarm is reported from both slot 6 and slot 7.

The three alarms have the same Subrack No., and Slot No. on the peer board in the alarm location information.
Check whether the service board which corresponds to the faulty trunk group is in position.
Y => The service board is in position. Go to 3.

N => The service board is out of position. Insert the service board into its corresponding slot. The alarm is cleared after its normal startup. The alarm handling is complete.
Check whether the service board that corresponds to the faulty trunk group is reset but is not started.
Y => The service board is reset. It is a normal symptom. The alarm is cleared after the boards are restarted. The alarm handling is complete.

N => The service board is not reset. Go to 4.
Secure the service board which corresponds to the switching board and the faulty link. Check whether the alarm is cleared.
Y => The alarm is cleared. The alarm handling is complete.

N => The alarm is not cleared. Go to 5.
Replace the service board which corresponds to the faulty trunk group and wait until the board is successfully loaded and restarted. Check whether the alarm is cleared.
Y => The alarm is cleared. The alarm handling is complete.

N => The alarm is not cleared. Go to 6.
Replace the faulty GSCU and wait until the board is successfully loaded and restarted. Check whether the alarm is cleared.
Y => The alarm is cleared. The alarm handling is complete.

N => The alarm is not cleared. Please contact Huawei Customer Service Center.