331 NSVC Faulty

Description

The NSVC refers to the virtual connection at the NS layer of the Gb interface. This alarm is generated when the GEPUG is faulty, the NSVC is blocked, the bearer channel is inaccessible, or the configuration of the BSC and SGSN is faulty.

Attribute

Alarm ID	Alarm Severity	Alarm Type
331	Major	Fault

Parameters

ID	Name	Meaning
1	NSEI	ID of the NSE where the alarm is generated
2	NSVCI	ID of the NSVC where the alarm is generated
3	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

Name

Meaning

NSEI

ID of the NSE where the alarm is generated

NSVCI

ID of the NSVC where the alarm is generated

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

If the backup NSVC is not configured, the data services in the relevant cells cannot be performed.
If a backup NSVC is configured, the data services in the relevant cells can be performed but the service capacity decreases.

System Actions

None.

Possible Causes

The GEPUG is faulty.
The NSVC is blocked.
The bearer channel is inaccessible.
The configuration of the BSC and SGSN is faulty.

Procedure

Run the MML command DSP NSVC to check whether the NSVC is blocked.
Y => Run the MML command UBL NSVC to unblock the NSVC.

N => Go to 2.
Run the MML command DSP BC to check whether the BC is available.
Y => Go to 3.
N => Configure the BC until the service is available.
On the LMT of the BSC and the SGSN, separately run the MML command LST NSVC. Check whether the configuration of the NSE and NSVC on the BSC and that on the SGSN are consistent.
Y => Go to 4.
N => Configure the NSE and Configure the NSVC of the BSC to ensure that they are consistent with those of the SGSN.
On the LMT, check whether the GEPUG runs normally.
Y => Go to 5.
N => Remove and reinsert the GEPUG until the board works normally.
Run the MML commands DSP BC and DSP PVC. Check whether the statistical data of the BC and PVC is normal.
Y => The alarm handling is complete.
N => Contact Huawei Customer Service Center.