20227 Regenerator Section Signal Deteriorated (RSD)

Description

The optical interface enters worsened status when the bit error rate(BER) of the regenerator section between the threshold 1E-3 and 1E-6, and quits worsened status when the bit error rate(BER) of the regenerator section less than the threshold 1E-7.

Attribute

Alarm ID	Alarm Severity	Alarm Type
20227	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 service quality of the optical fiber that generates an alarm becomes poorer or even interrupted.

System Actions

None.

Possible Causes

The transmission quality is poor.
The optical port is faulty.

Procedure

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

N=> Go to 2.

Correlated parent alarm

20226 Regenerator Section Signal Failure (RSF)

The parent alarm and the child alarm have the same Subrack No. and Slot No. in the alarm location information.
Contact the maintenance engineers who are responsible for maintaining the transmission network and confirm with them whether the transmission network has problems.
Y => The transmission network has problem. Ask the maintenance engineers to solve the problems. The alarm handling is complete.

N => The transmission network is working normally. Go to 3.
Replace the faulty board on the BSC side. Wait until the new board starts up and loads data successfully, 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.