Wer (Dtc Or Dcch) - HP 83206A User Manual

WER (DTC or DCCH)

DTC WER and DCCH WER can only be measured while the Test Set is in Active
mode, and the mobile is in its test mode. The DTC WER measurement is for raw
word error rate, measured on a traffic channel. DCCH WER measures word error
rate on the control channel.
Each mobile manufacturer has their own method of enabling the test mode for
their phones. Those methods will not be discussed here.
DTC WER Measurement Procedure
1. Make sure the Test Set is in Active mode.
2. Select DIG MEAS from the To Screen menu.
3. Set Amplitude to 50 dBm.
4. Select the Dig Meas field to display a list of available tests.
5. Select DTC WER from the list.
6. Enter the number of word to be measured in the WER Words field.
7. Put the mobile into loopback mode.
8. Select the WER Type field and choose Speech, FACCH, or SACCH data.
9. Select Arm.
10. After the actual number of words has been transmitted and received, the BER should
11. Gradually reduce the signal's amplitude. You should notice and increase in WER.
12. Raise the signal level back to 50 dBm.
13. Go to the DCCH CALL CONFIGURE screen and enter a number in the % BIT
be displayed. the measurements should all read 0.000% at 50 dBm.
ERROR field. This will insert bit errors onto the DTC. Note the response in the WER
measurement results.
Chapter 4, Making Measurements
WER (DTC or DCCH)
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