ALM-3798 IASU E1 Port Alarm

Description

When the MCU containing an IASU works in the E1 mode, an E1 port on the tributary unit (TU) in the IASU will be left idle. This alarm is triggered when the TU detects 2 M interface loss of analog signal (T_ALOS), 2 M line loss of signal indication (E1LOS) and 2 M interface loss of external clock (T_LOXC).

Attribute

Alarm ID	Alarm Severity	Alarm Type
3798	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. 55:IASU
3	Board No.	Number of the fault board 0:IASU
4	PassNo	Number of the passage where the faulty board is located.
5	SubLink No.	Alarm sub-category number 0:E1 port 1 1:E1 port 2 2:E1 port 3
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

When the alarm occurs, the BTS services or independent E1 services will be interrupted. The remote maintenance on the BTS is unavailable.

System Actions

None.

Possible Causes

The MCU containing IASU works in the E1 mode.
The E1 interface module between the IASU and IOMU is faulty.

Procedure

Check the transmission mode of the MCU
Then check whether the alarm is cleared.

Y=> The alarm handling ends.

N=> Go to Step 2.
Check whether the IOMU has been reset
This alarm might be triggered once the IOMU is reset. Check the maintenance log of the IOMU to see whether it has been reset.

Y=>The alarm is cleared when the reset of the IOMU is complete. The alarm handling ends.

N=>Go to Step 3.
Check the service configuration of the IASU
Check the service configuration for the TU in the IASU to see whether there are some invalid services. If yes, delete them and check whether the alarm is cleared.

Y=> The alarm handling ends.

N=> Please contact Huawei Customer Service Center