Last updated: December 3, 2008
This measurement is not applicable to GPRS or EGPRS.
This section provides an example of how to make the fast bit error (FBER) measurement via GPIB.
The following procedure assumes that an active link is established between the test set and the mobile station. See Establishing an Active GSM Link with the Mobile Station .
10 OUTPUT 714;"SETUP:FBERROR:TIMEOUT:TIME 5" ! BER measurement times out after 20 ! 5 seconds. 30 OUTPUT 714;"CALL:CELL:POWER:AMPLITUDE -85 DBM" ! Sets the cell power level to 40 ! a good level. 50 OUTPUT 714;"SETUP:FBERROR:CONTINUOUS OFF" ! Configures a BER measurement to 60 ! Single Trigger. 70 OUTPUT 714;"SETUP:FBERROR:COUNT 10000" ! Sets the number of bits to measure 80 ! at 10,000. 90 OUTPUT 714;"SETUP:FBERROR:CLSDELAY:STIME 500 MS" ! Sets the Close Loop Delay 100 ! to 500 ms. 110 OUTPUT 714;"SETUP:FBERROR:SLCONTROL ON" ! Sets the Signal Loop Control state to on. 120 OUTPUT 714;"SETUP:FBERROR:LDCONTROL:AUTO OFF" ! Configure loopback delay 130 ! control to manual. 140 OUTPUT 714;"SETUP:FBERROR:MANUAL:DELAY 6" ! Set frame delay to 6 frames in order 150 ! to correlate uplink and downlink bits. 160 OUTPUT 714;"CALL:CELL:POWER:AMPLITUDE -102 DBM" ! Sets the cell power level 170 ! to a "low" level for the 180 ! BER measurement. 190 OUTPUT 714;"INITIATE:FBERROR" ! Start a FBER measurement. 200 OUTPUT 714;"FETCH:FBERROR?" 210 ENTER 714;Integrity,Bits_tested,Fas_bit_ratio,Fas_bit_err_cnt 220 OUTPUT 714;"CALL:CELL:POWER:AMPLITUDE -85 DBM" ! Sets the cell power level 230 ! to a good level. 240 END
The measurements returned by this program are:
Integrity
returns the measurement
Integrity Indicator
(0 means a successful measurement with no errors).
Bits_tested
returns the number of bits tested.
Bit_error_ratio
retuns the ratio of bit errors to total bits tested, in percent (%).
Bit_error_count
returns the number of bit errors.