ALM-7510 Optical Transmit Channel Alarm

Description

This alarm is triggered when the TEU receives information that alarms occurs to the receiving optical path of peer NEs, such as MS-RDI (remote defect indication of multiplexing segment), HP-RDI (remote defect indication of high phase channel) and LP_RDI (remote defect indication of low phase channel). When this alarm occurs, there are alarms indicating reception failure at peer NEs, such as RLOS, RLOF, HPLOM and so on.

Attribute

Alarm ID	Alarm Severity	Alarm Type
7510	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. 68:DASU（TEU）
3	Board No.	Number of the fault board 0:TEU 0
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. 3:BTS30; 5:BTS312; 10:BTS3012A; 11:BTS3006A; 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

Services borne by the faulty optical interface are interrupted. If the optical interface connecting to the lower level devices fails, services supported by the lower level devices will be interrupted. If the optical interface connecting to the upper level devices fails, services supported by the devices of the lower level or the local level will be interrupted.

System Actions

None.

Possible Causes

Since the optical fiber is cut off, or the connector of the optical fiber is damaged, or interconnection between optical fibers is not proper, the optical signals sent by the TEU cannot be transmitted to the peer end.
The luminous power from the optical interface of the TEU is too weak, or the hardware at the optical interface fails, the NE at the peer end cannot receive optical signals and frame signals.
The peer NE cannot detect receiving optical signals normally since its receiving channel fails or the receiving performance of the optical module is less sensitive.

Procedure

Check optical transmission network
At the peer NE where the receiving optical path alarm occurs, measure the power of the optical signals received. The measurement result is smaller than -28dBm due to overmuch attenuation or poor contact. Check whether the optical fibers are connected properly, and whether the tail fibers are neat, and whether the optical fibers are broken, and whether attenuation is overmuch due to poor contact. Handle the faults if any accordingly. View whether the alarm is cleared.

Y=> The alarm handling ends.

N=> Go to Step 2.
Measure the transmission power of the optical signals from the TEU
Measure the transmission power of the optical signals from the TEU to see whether it is within the normal range -8dBm?-15dBm.

Y=> Go to Step 3.

N=>TEU hardware is faulty. Huawei Customer Service Center.
Perform self-loop for western optical fiber and eastern optical fiber
Perform self-loop for western optical fiber and eastern optical fiber. View whether the alarm is cleared.

Y=> The alarm handling ends.

N=> Huawei Customer Service Center. The alarm may be caused by TEU hardware failure.