ALM-5328 Level 2 VSWR Alarm

Description

The DUP Unit reports a VSWR alarm when detecting that the VSWR on antenna port A or antennal port B is greater than Serious Standing Wave Radio Alarm Threshold (default Value: 3.0).

Attribute

Alarm ID	Alarm Severity	Alarm Type
5328	Critical	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. 66:DUP Unit
3	Board No.	Number of the fault board Value range:0-35
4	PassNo	Number of the passage where the faulty board is located.
5	SubLink No.	Alarm sub-category number 0: Path A standing wave alarm 1: Path B standing wave alarm
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 DTRU connected to the DUP Unit stops outputting power when the alarm is triggered. The services will recover only after the alarm is cleared and the DTRU is manually reset.

System Actions

None.

Possible Causes

The connections of the antenna feeder transmit channel are faulty.
The DUP Unit hardware is faulty.

Procedure

Reset the DUP Unit. Check whether the alarm is cleared.
Y => The alarm is cleared. The alarm handling is complete.

N => The alarm is not cleared. Go to 2.
Check the cable connections between the antenna port of the duplexer and the antenna.
1. Check the channel corresponding to Sub No. in the alarm parameters.
2. Check the connections between the jumper and the duplexer, between the jumper and the feeder, between the jumper and the surge protector, and between the jumper and the antenna.
  Y => All the connections are good. Go to 3.
  
  N => A connection is not secured. Go to step c.
3. Tighten the loosened connectors. Reset the DUP Unit. Check whether the alarm is cleared.
  Y => The alarm is cleared. The alarm handling is complete.
  
  N => The alarm is not cleared. Go to step d.
4. Check whether the water leaks into the connectors between the jumper and the duplexer, between the jumper and the feeder, between the jumper and the surge protector, and between the jumper and the antenna.
  Y => There is water leakage. Go to step e.
  
  N => There is no water leakage. Go to 3.
5. Block the cell.
6. Replace the connector where water leakage occurs and conduct waterproof protection on the new connector in compliance with related engineering standards.
7. Unblock the cell.
8. Reset the DUP Unit. Check whether the alarm is cleared.
  Y => The alarm is cleared. The alarm handling is complete.
  
  N => The alarm is not cleared. Go to 3.
Replace the duplexer.
Replace the duplexer. Check whether the alarm is cleared.

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

N => The alarm is not cleared. Go to 4.
Check the antenna VSWR.
1. Measure the VSWR by using the related instrument at the antenna port of the duplexer. Locate whether the fault occurs on the jumper, surge protector, feeder, TMA, or the antenna.
2. Replace the faulty component. 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.
  
  NOTE:
  Locate the fault by using the preceding method. For example, if the measured VSWR of the jumper at the antenna port of the duplexer is abnormal, you can infer that the VSWR alarm is caused by the duplexer. The faults of other components can be located in the same way.
  
  NOTE:
  Reset the TRX to restore the services.