Performing The Loopback Test; Performing The Carrier Loopback Test - Huawei BTS3900 GSM Commissioning Manual

6 Optional Commissioning Tasks
Step 4 Repeat steps
the BTS.
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6.2 Performing the Loopback Test

This describes how to perform the loopback test. The loopback test is optional. Before testing
CS and PS services, you must check the transmission links of the signaling channels and traffic
channels in the BTS. Loopback tests can be classified into the carrier loopback test and the
channel loopback test.
Prerequisite
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6.2.1 Performing the Carrier Loopback Test

This describes how to perform the carrier loopback test. Before testing CS and PS services, you
must check the transmission links of the signaling channels in the BTS.
6.2.2 Performing Channel Loopback Tests
This describes how to perform channel loopback tests. Before testing CS and PS services, you
must check that the transmission links of the traffic channels in the BTS are proper.
6.2.1 Performing the Carrier Loopback Test
This describes how to perform the carrier loopback test. Before testing CS and PS services, you
must check the transmission links of the signaling channels in the BTS.
Context
The BIU loopback test is performed to test the link transmission of the TRX timeslots on the
BTS DBUS.
Procedure
Step 1 On the BSC6000 Local Maintenance Terminal window, choose BTS Maintenance >
Maintain TRX > Test TRX Loopback.
The Test TRX Loopback dialog box is displayed, as shown in
6-6
NOTE
You are advised to do as follows to ensure the accuracy of test results:
Make test calls within the power range of -30 dBm to -70 dBm under the tower.
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Perform the dialing test for more than five times.
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Step 2 through
The transmission between the BSC and the BTS is normal.
The current software version and data configuration on the LMT are correct.
No alarm related to disruption of BTS services is reported.
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Step 3 to check the antenna connections on all the frequencies of
BTS3900(A) GSM
Commissioning Guide
Figure 6-3.
Issue 02 (2009-04-20)