4186 Phase-lock loop critical alarm

Description

This alarm is reported when the phase-lock loop in the Carrier Module is faulty, causing the Carrier Module unable to run.

Attribute

Alarm ID Alarm Severity Alarm Type
4186 Major Fault

Parameters

ID Name Meaning
1 Site No.

Number of the site where the faulty board or module is located

Value range: 0-2047
2 Board Type

Number of the type which the faulty board belongs to.

65:DTRU/GTRU/DDRM

88:DRRU

92:DRFU

96:MRRU

100:MRFU

101:GRFU

102:GRRU

151:QTRU
3 Board No.

Number of the fault board
4 PassNo

Number of the passage where the faulty board is located.
5 SubLink No.

Alarm sub-category number

255:None
6 Cell Index

Index of the cell where the board or module is located

0-2047: Cell index of the faulty cell in the data configuration

65535: None
7 Site Type

Type of the site where the faulty board is located.

12:BTS3012;

13:BTS3006C;

14:BTS3002E;

15:BTS3012AE;

16:BTS3012 II;

17:DBS3900 GSM;

18:BTS3900 GSM;

19:BTS3900A GSM;
8 RackNo

Number of the rack where the faulty board is located.
9 BoxNo

Number of the subrack where the faulty board is located.
10 SlotNo

Number of the slot where the faulty board is located.
11 Site Name

Site Name
12 Alarm Attribute

Alarm Character

0:Normal

1:Transient Count

Impact on the System

All the services of the DTRU will be interrupted upon occurrence of this alarm.

System Actions

When this alarm occurs, the system shuts off the power amplifier automatically. For the DTRU of main BCCH, DTRU mutual aid is started.

Possible Causes

  • The DTRU is damaged.
  • The main control board is damaged.
  • The cable connected with the backplane of the DTRU is loose or damaged.
  • The backplane or the signal conversion card is destroyed.

Procedure

  1. Replace the faulty DTRU.

    Replace the faulty DTRU. Check if the alarm is cleared.

    Y=> The alarm is cleared. Alarm Handling is completed.

    N=> The alarm is not cleared. Go to Step 2.

  2. Check the main controlling module.

    Replace the main controlling module and see if the alarm is cleared.

    Y=> The alarm is cleared. Alarm Handling is completed.

    N=> The alarm is not cleared. Go to Step 3.

  3. Check the cables of the backplane or the signal conversion card.

    Plug out and in or replace the cables of the backplane or the signal conversion card. Check if the alarm is cleared.

    Y=> The alarm is cleared. Alarm Handling is completed.

    N=> The alarm is not cleared. Go to Step 4.

  4. Check the backplane and the signal conversion card.

    Replace the signal conversion card, backplanes of the DTRU frame and main control frame. Check if the alarm is cleared.

    Y=>The alarm is cleared. Alarm Handling is completed.

    N=>The alarm is not cleared. Please contact Huawei Customer Service Center.

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