ALM-7402 IASU Cock Source Lost Alarm

Description

This alarm is reported when the IASU detects the LTI signals.

Attribute

Alarm ID Alarm Severity Alarm Type
7402 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

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.

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

The transmission services are normal in 24 hours. Later, bit errors may be generated, or the services may be interrupted.

System Actions

None.

Possible Causes

  • The optical port of the receive clock source is faulty.
  • The clock of the upper-level BTS is not stable.
  • The clock frequency discrimination module works abnormally.

Procedure

  1. Check whether there are other alarms reported.

    Check whether ALM-7396 Optical Receive Channel Alarm is reported. If yes, rectify the alarm according to the suggestions. Then check whether the current alarm is cleared.

    Y=> The alarm handling is complete.

    N=> Go to Step 2.

    If 7396 optical receive channel alarm is reported, the received clock source signals of the corresponding optical channel are lost.

  2. Check the clock source priority list.
    1. Log in to the OptiX iManager NES.
    2. Choose Configuration > STG.....

      The Clock Configuration dialog box is displayed.

    3. Click the Clock Source Priority Table tab page. Check whether the settings of this table are correct.

      The correct settings are:

      Westward clock source and Internal clock source if the services of the local BTS 3006C are transmitted through the westward optical port.

      Eastward clock source and Internal clock source if the services of the local BTS 3006C are transmitted through the eastward optical port.

      Then check whether the alarm is cleared.

      Y=> The alarm handling is complete.

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

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