20964 Number of E1/T1 Frame Slips Within 24 Hours Over Max Threshold

Description

This alarm is reported when the number of frame slips within 24 hours exceeds the maximum alarm threshold (default: 255), which will result in a drop in QoS.

Attribute

Alarm ID Alarm Severity Alarm Type
20964 Major Fault

Parameters

ID Name Meaning
1 Subrack No.

The number of the subrack

2 Slot No.

The number of the slot

3 CPU No.

The number of the CPU

4 Link No.

The number of the Link

5 Frame Slips Number

The number of slip frames

6 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 relay services distributed on this E1/T1 will be affected while common calls will not. However, data services with a high demand on BER will be affected.

System Actions

None.

Possible Causes

Loss of system clock synchronization.

Procedure

  1. (1) Check whether the E1/T1 cables are well grounded and whether the shielding layers of the cables are in good condition.

    Y => Go to (2).

    N => Make the cables well grounded or replace the faulty cables. If the fault is cleared, end the handling. Otherwise go to (2).

    (2) Check whether the transmission devices or cables are in good condition.

    Y => Go to (3).

    N => Replace the faulty cables and devices. If the fault is cleared, end the handling. Otherwise go to (3).

    (3) Use the command LST CLKSRC to check whether the clock resource of this board is correctly configured.

    Y => Go to (4).

    N => Modify the clock configuration. If the fault is cleared, end the handling. Otherwise go to (4).

    (4) Check whether the clock resource of the peer equipment is correctly configured.

    Y => Go to (5).

    N => Modify the clock resource of the peer equipment. If the fault is cleared, end the handling. Otherwise go to (5).

    (5) Contact the technical support engineers of the RNC or CBSC.


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