ALM-7396 Optical Receive Channel Alarm

Description

This alarm is reported when the optical receive channel of the IASU (iSite Access SDH Unit）detects the RLOS signals or RLOF signals.

Attribute

Alarm ID Alarm Severity Alarm Type
7396 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.

68:DASU
3 Board No.

Number of the fault board

0-7:IASU
4 PassNo

Number of the passage where the faulty board is located.
5 SubLink No.

Alarm sub-category number

0: Westward optical channel (No.1 optical port)

1: Eastward optical channel (No.2 optical port)
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.

13:BTS3006C;

14:BTS3002E;
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

Communication is interrupted between the extension cabinet and the BSC.

System Actions

None.

Possible Causes

  • The peer BTS is powered off or uninstalled.
  • The power of the received optical signals is low.
  • The optical fiber connectors of the local BTS or the peer BTS is loosen or dirty.
  • The optical fiber tail of the local BTS or the peer BTS is over bent or broken.
  • The optical module of the local BTS or the peer BTS is ineffective.
  • The optical fibers between the local BTS and the peer BTS is broken.

Procedure

  1. Check whether the peer BTS is powered off or uninstalled.

    If the peer BTS is powered off, check the power supply equipment.

    If the peer BTS is not installed, install a BTS, or set the logic system of the local IASU to terminal multiplexer (TM).

    Then Check whether the alarm is cleared.

    Y=>The alarm is cleared. The alarm handling is complete.

    N=>The alarm is not cleared. Go to Step 2.

  2. Check the connectors and tail of the optical fiber.

    If the connectors are loosen or dirty, secure them and clean them using alcohol.

    The optical fiber tail of the local BTS or the peer BTS is over bent or broken, tie them again or replace them.

    Then check whether the alarm is cleared.

    Y=> The alarm handling is complete.

    N=> Go to Step 3.

  3. Check the power of the transmit and receive optical signals.

    Use an optical power meter to measure the power of the transmit and receive optical signals. Check whether the measurement is within the allowable limit.

    The transmit optical power must be –8 dBm to –15 dBm. The receive optical power must be –28 dBm to –35 dBm.

    Y=> The cause cannot be located. Please contact Huawei Customer Service Center.

    N=> Check whether the optical fibers are properly installed or damaged. If yes, infer that the problem does not lie in the optical fibers but lies in the peer optical module. The alarm handling is complete.

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