ALM-3420 Low Forward Power alarm

Description

This alarm is triggered when the BTS3001C coverage area shrinks because the PA is working abnormally, the output power decreases, or the detection circuit is abnormal.

Attribute

Alarm ID	Alarm Severity	Alarm Type
3420	Minor	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. 82:MCI
3	Board No.	Number of the fault board 0:MCI0 1:MCI1
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 7: BTS3001C-108/BTS3001C-116 8: BTS3001C-204
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

If this alarm occurs, this BTS3001C coverage area might shrink.

System Actions

None.

Possible Causes

Because the PA power is abnormal, the output power might be too low.
Because the power detection circuit is abnormal, the detection voltage might be too low.
The connection lines (including the power control signal line and the detection feedback signal line) between the PA and the MCI are interrupted.
The RF transmit circuit is abnormal, which makes the PA output power low.
The related processing circuit of the MCI is abnormal.

Procedure

Measure the output power of the BTS3001C antenna feeder port
Measure the output power of the BTS3001C antenna feeder port by power meter.Check whether the output is normal.

The normal output of BTS3001C-204 is 4W,the normal output of BTS3001C-108 is 8W,the normal output of BTS3001C-116 is 16W.

Y=>Go to step 2.

N=>There are hardware faults in the BTS3001C.Please contact Huawei Customer Service Center.
Dial to test through handset
Dial to test whether the conversation is normal through handset.

Y=>It is a false alarm. Go to step 3.

N=>There are hardware faults in the BTS3001C.Please contact Huawei Customer Service Center.
Reset the BTS
In the remote or local maintenance system, perform fourth-level reset on the BTS3001C and then check whether the alarm is cleared.

Y=>The alarm handling ends.

N=>The possible cause is that the hardware in the BTS3001C is faulty.Please contact Huawei Customer Service Center.