Checking Trxs In Ring Topology; Figure 6-8 Connection Between Trxs In Ring Topology - Huawei BTS3900 GSM Commissioning Manual

6 Optional Commissioning Tasks
transmission between the TRXs on the BTS side, or clear the alarm based on the BSS Alarm
Reference.
----End

6.6 Checking TRXs in Ring Topology

This describes how to check TRXs in ring topology on site. The following description is based
on level 3 of TRXs in ring topology.
Prerequisite
l
l
Context
l
l
Do not set breakpoints on the LMT when the TRXs are cascaded through the SFP high-speed
signal cable. Otherwise, the board will be seriously damaged. You can directly connect and
disconnect the signal cable between the cascaded TRXs to check the connection between them.
Procedure
Step 1 Check whether the TRX ring topology is configured on the LMT.
If...
The ring topology is configured
6-14
The physical connection between TRXs in ring topology on the BTS side is complete.
The configuration of the TRXs in ring topology on the BSC side is complete.
Figure 6-8 shows the connection between TRXs in ring topology. A, B, C, and D indicate
the positions where the link may be broken during the ring topology transmission.

Figure 6-8 Connection between TRXs in ring topology

A
BBU
The GTMU reports SFP Port Inconsistency Alarm when the ring topology is used in
physical connection but not in data configuration, or when the ring topology is used in data
configuration but not in physical connection.
CAUTION
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Copyright © Huawei Technologies Co., Ltd.
D R F U D R F U
R x 1 in R x 1 in
A N T 1 A N T 1
R x 1 o u t R x 1 o u t
R x 2 in R x 2 in
B
R x 2 o u t R x 2 o u t
C P R I_ 0 C P R I_ 0
C P R I_ 1 C P R I_ 1
R S T A N T 2 R S T A N T 2
R U N A L M R U N A L M
A C T V S W R A C T V S W R
C P R L 0 C P R L 1 C P R L 0 C P R L 1
P W R P W R
RFU0 RFU1
D
Then...
Go to Step 2.
BTS3900(A) GSM
Commissioning Guide
D R F U
R x 1 in
A N T 1
C R x 1 o u t
R x 2 in
R x 2 o u t
C P R I_ 0
C P R I_ 1
R S T A N T 2
R U N A L M
A C T V S W R
C P R L 0 C P R L 1
P W R
RFU2
Issue 02 (2009-04-20)