Fast Bit Error Troubleshooting

Last updated: December 3, 2008

Possible Setup Issues

This measurement is not applicable to GPRS or EGPRS. To run this measurement ensure the test set is configured for GSM measurements.

During remote operation of the Fast BER measurement you should configure the trigger arm to single, see SETup:FBERror .

If the trigger arm is not set to single, the measurement may not return a result. When trigger arm is continuous the measurement rearms itself and starts another measurement cycle, during remote operation the fetch query may not be synchronized to the measurement cycle, see Measurement States .

Set signalling loopback control to on; if signalling loopback control is off, set loopback to Type C, see CALL:TCHannel:LOOPback .

The test set may never correlate the uplink and downlink, see SETup:FBERror:LDControl:AUTO so that the measurement appears to hang. The mobile station may not have closed its loop after the loopback type was set. You must allow sufficient time for the mobile station to close its loop and set time out mechanisms see SETup:FBERror:TIMeout[:STIMe] .

Interpreting Integrity Indicator values

See Integrity Indicator .

Questionable Result for PGSM (15) Fast BER measurement appears to work but it is only possible on a Phase 2 GSM system.