Huawei BTS3900 GSM Commissioning Manual page 51

BTS3900 GSM
Commissioning Guide
Prerequisite
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Procedure
Step 1 Check the settings of the
are consistent with the on-site requirements.
Step 2 Check the operating status of the LIU0-LIU3 LEDs on the GTMU panel.
If...
All the LEDs are Off,
Some LEDs are ON or blink at 4 Hz, The corresponding E1/T1 links are not normal. Go to
You need to check the status of only the LIU LED corresponding to the E1/T1 cable in use. The state of the
LIU LED corresponding to the unused E1/T1 cable is Off.
Step 3 Check the connection and connectors at both ends of the cable. If any connector is damaged or
does not work properly, replace it with a new connector.
If...
The UELP is configured,
The UELP is not configured, Check the connection between the E1/T1 cable and the E1/
Step 4 At the DDF on the BTS side, check the soldering conditions of the connectors for the E1/T1
cable where communication is not normal. Ensure that the E1/T1 connectors are in good
soldering conditions.
Step 5 Perform a physical loopback test of the E1/T1 line where the communication is not normal. On
the BTS side, check whether the communication of the E1/T1 line is normal.
1.
Issue 03 (2008-07-15)
The BBU is connected to the BSC through an E1/T1 cable.
The BBU and the BSC are powered on.
DIP switches on the
NOTE
On the BTS side, disconnect A from C, disconnect B from D, and then connect A to B on
the DDF, as shown in
The normal E1/T1 connection between the BTS and the BSC consists of the connection
between A and C and connection between B and D.
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GTMU. Ensure that the settings of DIP switches
Then...
The communication between the BBU and the BSC
is normal. The checking is complete.
Step 3.
Then...
Check the connection between the E1/T1 cable and the
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OUTSIDE port on the UELP.
Check the connection between the E1 surge protection
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transfer cable and the INSIDE port on the UELP.
Check the connection between the E1 surge protection
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transfer cable and the E1/T1 port on the GTMU.
T1 port on the GTMU.
Figure 6-1. Thus, a physical loopback on the BTS side is formed.
6 Checking the Transmission and Networking
6-3