ALM-4778 BTS3012 cabinet 0 arrester alarm

Description

This alarm is reported when the lightning arrester on the main rack where the DTMU is located is faulty.

Attribute

Alarm ID	Alarm Severity	Alarm Type
4778	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. 64:DTMU/DOMU
3	Board No.	Number of the fault board 0-7:DTMU/DOMU
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;
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 lightning protection capability of the BTS is weakened.

System Actions

The abnormal slot alarm is reported.

Possible Causes

The lightning arrester is damaged.

Procedure

Check whether the surge protection unit of the power supply has the LED.
Y=>The surge protection unit has an LED. Go to 2.

N=> The surge protection unit does not have any LED. Go to 3.
The surge protection unit of the power supply has an LED.
1. Check the status of the LED on the surge protection unit.
  Y=>If the LED is red, replace the surge protection unit.
  
  To replace the surge protection unit, power off the cabinet, remove the faulty surge protection unit, and install a new surge protection unit. Then, check whether the alarm is cleared.
  
  Y=>The alarm is cleared. End alarm handling.
  
  N=>The alarm is not cleared. Go to step b.
  
  N=>If the LED is green, go to step b.
2. Check the alarm cable.
  Check the alarm cable between the surge protection unit and the DSAC to ensure that the alarm cable is properly connected. Then, check whether the alarm is cleared.
  
  Y=>The alarm is cleared. End alarm handling.
  
  N=>The alarm is not cleared. Contact Huawei Customer Service Center.
The surge protection unit of the power supply does not have any LED.
1. Check the alarm cable to ensure that it is properly connected. Then, check whether the alarm is cleared.
  Y=>The alarm is cleared. End alarm handling.
  
  N=>The alarm is not cleared. Go to step b.
2. Replace the surge protection unit. To replace the surge protection unit, power off the cabinet, remove the faulty surge protection unit, and install a new surge protection unit. Then, check whether the alarm is cleared
  Y=>The alarm is cleared. End alarm handling.
  
  N=>The alarm is not cleared. Contact Huawei Customer Service Center.