ALM-4176 Main receive channel alarm

Description

The alarm is reported when the gain of the main receive path smaller than that of the diversity receive path exceeds the relevant threshold.

Attribute

Alarm ID	Alarm Severity	Alarm Type
4176	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 UL sensibility of the DTRU decreases upon occurrence of this alarm.

System Actions

None.

Possible Causes

The RF cable connected to the main receive port on the DTRU is loose or damaged.
The DTRU is damaged.
The DAFU is damaged.
The main receive cable between the DDPU and the cabinet top is loose or damaged.
The cable between the cabinet top and antenna is loose or damaged or the tower top amplifier (TTA) between them is damaged.

Procedure

Check the RF cable connected to the main receive port on the DTRU.
1. Check whether the RF cable connected to the main receive port on the DTRU is loose or damaged.
  Y=> Go to b.
  
  N=> Go to c .
2. Secure the loose connector to the port or replace the damaged cable.
3. Check if the alarm is cleared.
  Y=> The alarm is cleared. Alarm Handling is completed.
  
  N=> The alarm is not cleared. Go to Step 2.
Check whether the DTRU is faulty or not.
Replace the faulty DTRU and see if the alarm is cleared.

Y=> The alarm is cleared. Alarm Handling is completed.

N=> The alarm is not cleared. Go to Step 3.
Check the DAFU.
Replace the faulty DAFU. Check if the alarm is cleared.

Y=> The alarm is cleared. Alarm Handling is completed.

N=> The alarm is not cleared. Go to Step 4.
Check the main receive cable between the DDPU and cabinet top
1. Check whether the main receive RF cable between the DDPU and cabinet top is is loose or damaged.
  Y=>Go to b.
  
  N=>Go to c.
2. Secure the loose connector to the port or replace the damaged cable.
3. Check if the alarm is cleared.
  Y=>The alarm is cleared. Alarm Handling is completed.
  
  N=>The alarm is not cleared. Go to Step 5.
Check all the cables and devices between the cabinet top and antenna.
1. Check all the cables and devices between the cabinet top and antenna to see whether there is any loose cable connector, cable damage or TTA damage.
  Y=>Go to b.
  
  N=>Go to c.
2. Secure the cable connector to the relevant port or replace the cable or TTA.
3. Check 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.