Checking The Consistency Between Actual Networking And Data Configuration; Figure 6-1 Physical Loopback Of E1/T1 At The Ddf - Huawei BTS3900 GSM Commissioning Manual

6 Checking the Transmission and Networking
2.
3.
Step 6 Check the E1/T1 connection at the DDF. Ensure that the TX and RX ends of the E1/T1 cables
are connected properly.
----End
6.3 Checking the Consistency Between Actual Networking
and Data Configuration
The items to be checked consist of the BTS3900 network topologies, the configurations of the
boards and modules, RF cable connections of the DRFUs, and the data configuration of the RF
signal RX/TX mode.
Prerequisite
l
l
l
6-4

Figure 6-1 Physical loopback of E1/T1 at the DDF

E1/T1
E1/T1
BTS
Check the status of the LIU LED on the GTMU panel again.
If...
The LED is OFF,
The LED is ON or blinks at 4 Hz,
Restore the normal E1/T1 connection at the DDF on the BTS side and ensure that the
connection is proper.
NOTE
You can determine the TX or RX end of the E1 cable in the following manner:
Connect one pin of a common LED to the E1/T1 wire, and connect the other pin of the LED to the shielding
layer of the E1/T1 cable. If the LED is ON, the port is a TX port. If the LED is OFF, the port is an RX port.
The Site Maintenance Terminal System is started.
The board software is loaded and activated.
The transmission between the BBU and the DRFU and the transmission between the BBU
and the BSC are normal.
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A C
E1/T1
E1/T1
B D
DDF
Then...
The E1 link on the BTS side is normal. The
connection between the BTS and the BSC
is abnormal or the E1 link on the BSC side
is abnormal. End the testing task. Contact
Huawei BSC technical support engineers
to rectify the fault.
The E1 link on the BTS side is abnormal.
Rectify the fault on the BTS side.
BTS3900 GSM
Commissioning Guide
BSC
Issue 03 (2008-07-15)