ALM-2294 EDU VSWR Critical Alarm

Description

The alarm is triggered when 2292 EDU VSWR Alarm lasts more than one minute.

Attribute

Alarm ID Alarm Severity Alarm Type
2294 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.

130:EDU(EDU uses the ID of the CDU)

3 Board No.

Number of the fault board

0:EDU 0

1:EDU 1

4 PassNo

Number of the passage where the faulty board is located.

5 SubLink No.

Alarm sub-category number

0:EDU port 0

1:EDU port 1

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

3: BTS30

5: BTS312

10: BTS3012A

11: BTS3006A

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

This alarm shows that the jumper is not well connected with the EDU antenna port for a long time. It will cause the BTS to turn off a power amplifier to stop downlink transmit signals through the corresponding EDU tributary.

System Actions

None.

Possible Causes

  • The EDU is not properly connected with the jumpers on the antenna feeder tributary.
  • The feeder (including connector) is damaged.
  • Such devices on the antenna feeder tributary as the tower top amplifier (TTA) and lightning arrester are damaged.
  • The antenna is damaged.
  • The EDU alarm circuit is abnormal.

Procedure

  1. Check jumper connections

    Turn off the power amplifier of the TRX corresponding to the EDU. Check whether the jumpers between the EDU antenna port and the feeders are well connected.

    NOTE:

    Turn off the power amplifier of the TRX to stop power transmission before disconnecting the jumpers between the EDU output port and the TRX input port.

    Y=> Go to Step2.

    N=> Secure the jumper connectors to the ports. Go to Step3.

  2. Measure the VSWR at the EDU antenna port

    Measure the VSWR of the jumper side at the EDU antenna port using a sitemaster or another meter with the similar function. Check whether the measured VSWR exceeds the alarm threshold (nominal 2.5).

    Y=> Further measure the VSWR of the antenna feeder tributary, including the jumpers, lightning arrester, feeder and antenna.

    N=> There might be a false alarm. Replace the EDU and go to Step[3].

  3. Check whether the alarm is cleared

    Securely connect the jumpers to the EDU output port and to the TRX input port. Turn on the power amplifier of the corresponding TRX. Check whether the alarm is cleared.

    Y=> The alarm handling ends.

    N=> Please contact Huawei Customer Service Center

    NOTE:

    Handle this alarm upon occurrence of it.


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