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8960 Wireless Communications Test Set
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Programming a Fast Bit Error Measurement

Last updated: May 8, 2002

This measurement is not applicable to GPRS.

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 .

  1. Set the cell power to a good level.
  2. Configure FBER measurement parameters using the SETup subsystem.
  3. Set the cell power to a low level for a FBER measurement.
  4. Start the FBER measurement using the INITiate subsystem.
  5. Use the FETCh? command to obtain FBER measurement results.
  6. Set the cell power to a good level.

Programming Example

 
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

Returned values

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.


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