20241 Loss of Tributary Unit Pointer (TULOP)

Description

Tributary unit loss of pointer

Attribute

Alarm ID Alarm Severity Alarm Type
20241 Major Fault

Parameters

ID Name Meaning
1 Subrack No.

Subrack No.
2 Slot No.

Slot No.
3 Cpu No.

CPU No.
4 Tributary Unit No.

0 - 62(for E1 mode), 0 - 83(for T1 mode).
5 Site No.

The IDs of all sites whose OMLs are on the faulty E1/T1. If BTS are cascade connected,a maximum of 4 sites are shown.Only Abis E1/T1 alarm has this parameter.
6 Site Name

The Names of all sites whose OMLs are on the faulty E1/T1. If BTS are cascade connected,a maximum of 4 sites are shown.Only Abis E1/T1 alarm has this parameter.
7 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

Services carried on the affected tributary unit 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

  • The service configuration for the transmission device is wrong.
  • The the Optical Port on the local board is faulty.
  • The the Optical Port on the peer board is faulty.

Procedure

  1. Ask the transmission engineer to check whether the service configuration for the transmission service is correct.

    N => Ask the engineer to modify the service configuration. The alarm handling is complete.

    Y => Go to 2.

  2. Replace the local board and wait until the board is successfully restarted. Check whether the alarm is cleared.

    Y => The alarm is cleared. The alarm handling is complete.

    N => The alarm persists. Go to 3.

  3. Replace the peer board and wait until the board is successfully restarted. 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.

Parent topic: BSC Alarm Reference
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