Operating Manual Vol 1 - ES Documentation

Enhanced Functions For Digital Standard 3GPP W-CDMA (FDD)SMIQ2.15.3.1.3 Bit Error InsertionErrors can be inserted in the data source or the CRC checksum for testing the bit/block error rate tester.If channel coding is inactive (CHANNEL CODING STATE = OFF), the data bits are fed into the slots at thephysical level. If channel coding is active (CHANNEL CODING STATE = ON), the data bits are fed at thetransport layer level. The bit errors are always generated at the data source level.INSERT BIT ERRORSIN DATANOMINAL BITERROR RATERESULTING BITERROR RATESwitch used to activate or deactivate the insertion of bit errors in the data fieldsof all active enhanced channels at the frequency indicated under the NOMINALBIT ERROR RATE parameter.In the OFF state, the following menu parameters NOMINAL BIT ERRORRATE and RESULTING BIT ERROR RATE are not effective.IEC/IEEE-bus :SOUR:W3GP:BST:ENH:DERR:BIT:STAT ONSets a user-defined bit error rate in the range of 10 -1 to 10 -7 with which the bitscan be inserted into the data fields of the enhanced channel timeslots. Uponreadout of the data source individual bits are inverted at random at a givenerror rate to simulate an erroneous signal.Since the bit error rate set by the user may not be adhered to as a function ofthe frame SEQUENCE LENGTH and the selected SYMBOL RATE DPCH orOVERALL SYMBOL RATE, the actual bit error rate is displayed in the nextline, i.e. RESULTING BIT ERROR RATE.IEC/IEEE-bus :SOUR:W3GP:BST:ENH:DERR:BIT:RATE 2E-3Parameter indicating the resulting bit error rate used to insert the bits into thedata fields of the enhanced channel timeslots (see NOMINAL BIT ERRORRATE parameter).CHANNEL CODING STATE = OFF:The BER of DPCH is displayed here.IEC/IEEE-bus :SOUR:W3GP:BST:ENH:DERR:BIT:DPCH?CHANNEL CODING STATE = ON:The BER of DTCH and DCCH is displayed here.IEC/IEEE-bus :SOUR:W3GP:BST:ENH:DERR:BIT:DTCH?IEC/IEEE-bus :SOUR:W3GP:BST:ENH:DERR:BIT:DCCH?1125.5555.03 2.244 E-9