20271 Serial Port Fault

Description

Serial ports are faulty. Local boards cannot communicate with monitoring boards (power distribution box, fan box, and EAC) through the serial ports.

Attribute

Alarm ID Alarm Severity Alarm Type
20271 Minor 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 monitoring of fan, power box, and environment device is unavailable.

System Actions

None.

Possible Causes

  • The hardware of the board is faulty.
  • There is an over-inflow of data transmitted from the CPU.

Procedure

  1. Reset the board and wait for its startup, and then check whether the alarm is cleared.

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

    N => The alarm persists. Go to 2.

  2. Replace the 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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