Operating Manual Vol 1 - ES Documentation

Bit Error Rate TestSMIQPATTERN IGNOREIn the event of a so-called frame error (eg an error detected in the check sum),some mobile radio standards communicate a complete "0" or "1" frame to theBERT instead of the detected frame data. This is to signal to the BERT thatthis frame is not to be used for the BER measurement.OFF PATTERN IGNORE is not active.ALL 1 Bit sequences consisting of 31 or more subsequent "1" dataare not used (ie ignored) for the BER measurement.ALL 0 Bit sequences consisting of 31 or more subsequent "0" dataare not used (ie ignored) for the BER measurement.IEC/IEEE-bus command :BERT:SET:IGN OFFNotes:- While ignoring the bits, the PRBS generator for the BER measurementkeeps running. Following the "0" or "1" sequence, the BER measurementis continued as if the ignored sequence had contained PRBS data.- If PATTERN IGNORE is switched on, synchronization time is 32 bitslonger.- If PATTERN IGNORE and RESTART are active at the same time, thepresence of the restart signal causes the measurement to stopimmediately. None of the 32 bits within the PATTERN IGNORE detectoris evaluated.- If DATA ENABLE and PATTERN IGNORE are active at the same time,DATA ENABLE is given priority, ie bits that are not enabled are notexamined for "0" or "1" sequences.Drop Out of DUTPRBS at GeneratorPRBS at DUT OutputBER "active"50 BitsThese bits are ingoredExample 50 bits were set to "0" by the DUT. These 50 bits plus the preceding"0" are ignored in the measurement.UNITSetting the unit for displaying the bit error rate.OFF No unit, decade values% Relative frequency in percentppm Relative frequency in parts per millionIEC/IEEE-bus command :BERT:UNIT OFF1125.5555.03 2.372 E-9