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.
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
-
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.
-
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].
-
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.