Checking The Transmission Between The Rru And The Bbu Or Between The Bbu And The Bsc On The Lmt - Huawei BTS3900 GSM Commissioning Manual

BTS3900(A) GSM
Commissioning Guide
4.2.3 Checking the Transmission Between BTSs in Ring Topology
This describes how to check the transmission between BTSs in ring topology. The following
description is based on three BTSs in ring topology.
4.2.1 Checking the Transmission Between the RRU and the BBU or
Between the BBU and the BSC on the LMT
This describes how to check the transmission between the BBU and the BSC and the transmission
between the BBU and the RFU.
Procedure
Step 1 Choose BSC Maintenance > Maintain Transmission and Signaling > Maintain LAPD
Link on the LMT.
The Maintain LAPD Link dialog box is displayed.
Step 2 Select the link and site to be queried, and click Query. The result is displayed on the Query
Result window.
If...
OML links and RSL links are normal End the checking task.
OML links or RSL links are faulty
----End
Example
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Issue 02 (2009-04-20)
Check whether the OML link between the BBU and the BSC is normal. If the state of the
OML link is normal, the BBU is properly connected to the BSC, as shown in
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4 Commissioning the BTS (Transmission Available)
Then...
Check for the related alarm, for example, 1000
LAPD_OML Fault alarm. Then rectify the fault
according to the alarm help.
The possible causes of the faulty links are as
follows:
The BTS does not work properly.
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The transmission cables between the BSC and the
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RFU or BBU are damaged, or the ports to which
the transmission cables are connected are faulty.
NOTE
If the BTS data has just been configured on the LMT, you
should reset the BBU first. After the BBU detects the
information sent by the BSC and initiates the link setup
procedure, the OML link can be detected.
Figure 4-5.
4-5