Huawei BTS3900 GSM Commissioning Manual page 105

BTS3900(A) GSM
Commissioning Guide
Procedure
Step 1 Check whether the settings of DIP switch meet the field requirements. if not, modify the settings
of DIP switch as required.
Step 2 Check the status of the LEDs LIU0 to LIU3 on the panel of the GTMU in the BBU. The LEDs
LIU0 to LIU3 correspond to link 1 to 4 of the E1/T1 cable. Each link has one TX line and one
RX line.
If...
The LEDs are OFF
The LEDs are ON or ON for 0.125s and OFF
for 0.125s
Step 3 Check the connections and connectors at both ends of the cables. If the connector is damaged,
replace it.
If...
The UELP is configured
The UELP is not configured
Step 4 At the DDF on the BTS side, check the soldering conditions for the connectors of the E1/T1 link
where the communication is abnormal. Ensure sound jointing, since poor jointing may cause
poor E1/T1 connection.
Step 5 Perform a physical loopback test on the E1/T1 cable where the communication is abnormal.
Check whether the transmission of the E1/T1 cable is normal on the BTS side.
Issue 02 (2009-04-20)
NOTE
You need check the status of only the LIU LEDs corresponding to the E1/T1 line in use. The LIU LEDs
corresponding to the unused E1/T1 cables are ON.
If the BBU is in non cascaded, there is only one E1/T1 link between the BBU and the BSC and the
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corresponding LED is LIU0. If the LIU0 LED is OFF, it indicates the communication between the
BBU and the BSC is normal. Otherwise, the communication is abnormal.
If the two BBUs are cascaded, the second E1/T1 link of level 1 BBU is connected to the first E1/T1
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link of level 2 BBU. Check the LIU1 LED and LIU0 LED on level 1 BBU and level 2 BBU respectively
to verify whether the physical link is operational. If multiple BBUs are cascaded, check the LEDs of
the corresponding links.
If the BBU and the BSC form a ring, check the LIUs corresponding to the links in the ring to verify
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whether the communication is normal. For the connections of multiple BBUs and the LEDs to be
checked, see that of the two BBUs in cascading connection.
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Then...
The E1/T1 links are normal. End this task.
The E1/T1 links are abnormal. Go to
Then...
Check whether the E1/T1 cable is connected properly
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to the OUTSIDE port on the UELP.
Check whether the E1 surge protection transfer cable
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is connected properly to the INSIDE port on the
UELP.
Check whether the E1 surge protection transfer cable
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is connected properly to the E1/T1 on the GTMU.
Check whether the E1/T1 cable is connected properly
to the E1/T1 port on the GTMU.
6 Optional Commissioning Tasks
Step 3.
6-11