Chapter 9 277
BERT
Measuring RF Loopback BERT with Option 300
Figure 9-8
Synchronizing to the TCH
The following steps show you how to synchronize to the traffic channel. The TCH is only required to
contain a valid midamble. If appropriate for your base station, this synchronization can be performed
without prior BCH synchronization.
NOTE If the base station is transmitting a BCH signal, turn it off at this time.
1. Follow the instructions under “Configuring GSM Mode on the Agilent Technologies E4406A VSA
Series Transmitter Tester” and “Configuring GSM Mode on the ESG Vector Signal Generator” in this
chapter, to prepare the test equipment for synchronization.
2. Set up the base station and start sending the TCH signal now. The TCH is only required to contain a
valid midamble.
3. On the ESG, press
Aux Fctn > BERT > BTS BERT GSM Loopback.
4. Press
Sync Source BCH TCH/PDCH to TCH/PDCH.
5. Press
Configure Measurement > Timeslot # > 2 > Enter.
This sets the ESG to expect the TCH in timeslot 2.
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