133 BSC Unable to Unblock a Circuit

Description

The alarm is reported when the BSC sends Unblock messages twice to the MSC but has no replies from the MSC.

Attribute

Alarm ID Alarm Severity Alarm Type
133 Minor Event

Parameters

ID Name Meaning
1 DPCGROUP

DPCGROUP of the unblock circuit that is not configured

2 CicNum

Numbers of Circuit identification code (CIC) of the unblock circuits those are not configured

3 CIC

Circuit identification code (CIC) of the unblock circuit that is not configured

4 OSP

Original signaling point (OSP) of the subrack where the unblock circuit is located

5 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 state of the circuit in the BSC is inconsistent with that in the MSC, causing a decrease in available circuit resources.

System Actions

None.

Possible Causes

The SS7 link has intermittent bit errors.

Procedure

  1. Check whether the fault alarms (20081 Loss of E1/T1 Signals (LOS),20082 Loss of E1/T1 Frames (LOF)).

    Y => Refer to the handling suggestions for clearing E1/T1 alarms.

    No => Please contact Huawei Customer Service Center.


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