20228 Multiplex Section Alarm Indication Signal (MAIS)

Description

The alarm indication signal of the multiplex section at optical interface

Attribute

Alarm ID	Alarm Severity	Alarm Type
20228	Major	Fault

Parameters

ID	Name	Meaning
1	Subrack No.	Subrack No.
2	Slot No.	Slot No.
3	Cpu No.	CPU No.
4	Optical Interface No.	Optical interface No.
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 services carried on the affected optical cable stop.

System Actions

Handling of the active board in the active/standby operation mode: Perform the switchover if the standby is ready for the operation.
Handling of the standby board in the active/standby operation mode: None.
Handling of the board in the Independent operation mode: None.

Possible Causes

No signal is detected between the peer equipment (BTS or BSC) and the transmission equipment, whereas the transmission equipment is normally connected with the local equipment.

Procedure

Refer to the maintenance manual for the peer equipment to handle the fault, and then check whether the alarm is cleared.
Y => The alarm is cleared. The alarm handling is complete.

N => The alarm persists. Please contact Huawei Customer Service Center.