4120 TRX DBUS Alarm

Description

This alarm is reported when the DBUS clock of the TRX is abnormal or the TRX hardware detects that the DBUS signal sent by the main control module is lost.

Attribute

Alarm ID	Alarm Severity	Alarm Type
4120	Warning	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

The services will be interrupted when the alarm is generated.

System Actions

Check if the alarm is cleared every certain period of time.

Possible Causes

The cable distribution of the rack is faulty.
The backplane of the DTRU subrack is faulty.
The signal transfer card is faulty.
The backplane of the main control module is faulty.
The main control module is faulty.
The DTRU hardware is faulty.
The E1 transmission cable is faulty.
The DBUS of the rack is faulty.

Procedure

Replace the cable distribution of the rack.
Replace the cable distribution of the rack, and check whether the alarm is cleared.

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

N => The alarm is not cleared. Go to procedure 2.
Replace the backplane of the DTRU subrack.
Replace the DTRU, and check whether the alarm is cleared.

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

N => The alarm is not cleared. Go to procedure 3.
Replace the signal transfer card.
Replace the signal conversion card, and check whether the alarm is cleared.

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

N => The alarm is not cleared. Go to procedure 4.
Replace the backplane of the main control module.
Replace the backplane of the main control module, and check whether the alarm is cleared.

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

N => The alarm is not cleared. Go to procedure 5.
Replace the main control module.
Replace the main control module, and check whether the alarm is cleared.

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

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