ALM-3592 Radio Link alarm

Description

This alarm is triggered when the BTS3002C detects the radio link abnormity continuously. The radio link abnormity includes two cases: for all non-main BCCH carriers, the radio link fault occurs to the odd timeslots or even timeslots 20 times continuously, or there is no uplink message. For main-BCCH carriers, there are not any traffic over them for long (24 hours).

Attribute

Alarm ID	Alarm Severity	Alarm Type
3592	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. 135:DRU
3	Board No.	Number of the fault board 0:DRU0 1:DRU1
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 or module is located 9: BTS3002C
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

None.

System Actions

None.

Possible Causes

The data configuration is incorrect.
The DRU hardware is faulty.

Procedure

Check the traffic statistics
Query traffic statistic data on the BSC traffic statistic system. Check if there is no traffic over the faulty DRU for long.

Y=>Go to Step 5.

N=>Go to Step 2.
Check whether there are any correlated alarms
Check whether the ALM-3606 DRU Hardware alarm is reported on the LMT.

Y=>Handle the ALM-3606 DRU Hardware alarm according to the corresponding handling suggestions and check whether the alarm is cleared .The alarm is cleared, Alarm handling is completed. The alarm is not cleared, Go to Step 3.

N=>Go to Step 3.
Measure the output power of the faulty DRU
1. Measure the output power at the faulty DRU antenna port of the BTS3002C with a power meter to see whether it complies with the data configuration.
2. Check DRU static power class.
3. Calculate DRU configuration power and judge whether the output power is normal.
  note:
  
  Based on the formula: DRU configuration power (dBm) = 43.5 (dBm) - power class × 2 (dB).Compare the calculation result with the measurement result. If the measurement result is 2dBm smaller than the calculation result, the actual output power is abnomal.
  
  Y=> Go to Step 4.
  
  N=>The DRU hardware may be faulty. Please contact Huawei Customer Service Center.
Dial-on test
Lock the faulty frequency with an MS and make a call test to see whether the test call is successful.

Y=>Go to Step 5.

N=>The DRU hardware may be faulty. Please contact Huawei Customer Service Center.
Reset the DRU
Perform fourth-level reset on the BTS3002C through the LMT or local maintenance system. Check whether the alarm is cleared.

Y=> The alarm handling ends.

N=> Go to Step 6.
Remove and reinsert the MCU and DRU
Power down the BTS3002C. Remove and reinsert the modules on the backplane to ensure they are in well connection. Power on the BTS3002C and check whether the alarm is cleared.

Y=> The alarm handling ends.

N=> Go to Step 7.
Replace the MCU and DRU and see 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.