20009 Faulty 8 kHz Clock Source from the Active GGCU to the Backplane of the GSCU

Description

This alarm is reported when the 8 kHz clock source from the active GGCU to the backplane of the GSCU is faulty.

Attribute

Alarm ID	Alarm Severity	Alarm Type
20009	Major	Fault

Parameters

ID	Name	Meaning
1	Subrack No.	Subrack No.
2	Slot No.	Slot No.
3	Cpu No.	CPU No.
4	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 voice quality and data transmission are affected.

System Actions

None

Possible Causes

The upper-level clock source on the active GGCU is not locked, and no clock source is provided for the GSCU.
The active GGCU is faulty.
The GSCU is faulty.
The backplane is faulty.

Procedure

Check whether the alarm is generated on both the active and the standby GSCUs.
Y => The alarm is generated on both GSCUs. Go to 2.

N => The alarm is generated on only one GSCU. Go to 4.
Insert securely the active GGCU and then check whether the alarm is cleared.
Y => The alarm is cleared. The alarm handling is complete.

N => The alarm is not cleared. Go to 3.
Switch over the GGCUs and 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.
Insert securely the GSCU and then 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.
Check whether the active board reports the alarm.
Y => The active board reports the alarm. Go to 6.

N => The standby board reports the alarm. Go to 7.
If the alarm is reported by the active board, a switchover between the active and standby boards will be automatically performed.If the standby board has a same- or higher-level alarm, the switchover fails, resulting in the persistence of the alarm within the active board.Clear the alarm of the standby board by adhering to relevant alarm-handling procedures, and then check whether the switchover between the active and standby boards is performed.
Y => The switchover is successful. Go to 7.

N => The switchover fails. Please contact Huawei Customer Service Center.
Replace the faulty standby GSCU and wait until the new board is successfully loaded and reset. 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.