278 Chapter 9
BERT
Measuring RF Loopback BERT with Option 300
6. Press Return > GSM BERT Off On to On.
NOTE If the following error message is generated:
522 Demodulator Unleveled; Input amplitude underrange
this indicates that the TCH signal is not being received.
7. Press
Synchronize to BCH/TCH/PDCH to begin synchronization to the TCH.
Then you will see Synchronizing to TCH flashing on the display followed by the Synchronizing
to PN message.
Once synchronization is achieved, the Ready TCH Sync Lock message is displayed. Refer to Figure
9-9.
Figure 9-9
Making Loopback BERT Measurements
The following procedure shows you how to configure the frame count, set pass/fail limits and set early stop
criteria for loopback BERT measurements.
1. Press
Configure Measurement > Measurement Mode BER/BLER% Search to BER/BLER%.
2. Press
BER/BLER% Configure > BER% TCH/FS Configure.
3. Press
Frame Count > 100 > Enter.
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