ALM-4704 CAN I2C Link Abnormal

Description

This alarm is reported when the CAN main control module finds that the communication between the CAN node and I2C device such as fan Board and power board is faulty.

Attribute

Alarm ID	Alarm Severity	Alarm Type
4704	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. 87:GTMU
3	Board No.	Number of the fault board 0:GTMU
4	PassNo	Number of the passage where the faulty board is located.
5	SubLink No.	Alarm sub-category number 0-19: The I2C link of the board in 0-19 slot is not normal
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. 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

When the alarm is generated, the main control module of the BTS fails to manage the I2C device in the BBU.

System Actions

None.

Possible Causes

The GTMU, UPEU, UEIU, or UBFA is faulty.
The backplane BSBC of the BBU is damaged.
The GTMU is in standby state.

Procedure

Check whether the alarm is generated in one or all of the slots in the BBU.
1. .
2. .
If the alarm is generated in one slot, unplug and plug the board on which the alarm is generated. Check whether the alarm is cleared:
Y => The alarm is cleared. No further action is required.

N = > The alarm is generated again. Replace the board.
If the alarm is generated in all of the slot in the BBU, determine whether the site is a GSM+UMTS type or a GSM only type.
1. If the site is of the GSM + UMTS type, unplug and plug the WMPT board.
  Y => The alarm is cleared. No further action is required.
  
  N => The alarm is not cleared. Go to step 4.
2. If the site is of the GSM only type, replace the GTMU board.
  Y => The alarm is cleared. No further action is required.
  
  N => The alarm is not cleared. Go to step 4.
Replace the BBU case. Check whether the alarm is cleared:
Y => The alarm is cleared. No further action is required.

N => The alarm is not cleared. Contact Huawei Customer Service Center.