Performing The Loopback Test Of A Channel; Performing The Loopback Test Of A Signaling Channel - Huawei BTS3900 GSM Commissioning Manual

9 Commissioning the BTS3900 Services

9.1 Performing the Loopback Test of a Channel

This describes how to perform the loopback test of a channel. Before testing the CS and PS
services, you must check whether the transmission links of the signaling channel and traffic
channel are normal. The loopback test of a channel consists of the loopback test of a signaling
channel and the loopback test of a traffic channel.

9.1.1 Performing the Loopback Test of a Signaling Channel

This describes how to perform the loopback test of a signaling channel. Before testing the CS
and PS services, you must check whether the transmission links of the signaling channel are
normal through the baseband test on the Site Maintenance Terminal System. The baseband test
consists of the BIU loopback test and the TRX self-test.
9.1.2 Performing the Loopback Test of a Traffic Channel
This describes how to perform the loopback test of a traffic channel. Before testing the circuit
switched (CS) and packet switched (PS) services, you need to perform the loopback test on the
Site Maintenance Terminal System to check the transmission link of traffic channels of the BTS.
The loopback test of a traffic channel involves the BIU loopback test and the TRX RF self-test.
9.1.1 Performing the Loopback Test of a Signaling Channel
This describes how to perform the loopback test of a signaling channel. Before testing the CS
and PS services, you must check whether the transmission links of the signaling channel are
normal through the baseband test on the Site Maintenance Terminal System. The baseband test
consists of the BIU loopback test and the TRX self-test.
Background Introduction
l
l
Procedure
Step 1 In the left pane of the Site Maintenance Terminal System window, select BT. In the right pane
of the window, double-click BT Loop Test.
The BT Loop Test dialog box is displayed, as shown in
9-2
The BIU loopback test is performed to test the link transmission of the TRX timeslots on
the DBUS.
The TRX self-test is performed to check whether the logical channel from the BBU to the
DSP in the RRU/DRFU is functional.
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BTS3900 GSM
Commissioning Guide
Figure 9-1.
Issue 03 (2008-07-15)