R&S AFQ100A Operating Manual page 191

R&S AFQ100A
Pattern Ignore
Note:
While ignoring the bits, the PRBS generator for the BER measurement keeps running. Following the
"0" or "1" sequence, the BER measurement is continued as if the ignored sequence had contained
PRBS data.
If Pattern Ignore is switched on, synchronization time is 32 bits longer.
If Pattern Ignore and External Restart are active at the same time, the measurement terminates
immediately when the restart signal is applied. None of the 32 bits within the Pattern Ignore detector
is evaluated.
If Data Enable and Pattern Ignore are active at the same time, Data Enable is given priority, i.e. bits
that are not enabled are not examined for "0" or "1" sequences.
1401.3084.32
Bit Error Rate Measurements - BERT Block
Activates/deactivates ignoring of pure "0" or "1" bit sequences at least
32 bits long. Activating Pattern Ignore excludes faulty frames from the
measurement.
In the case of some mobile radio standards, pure "0" or "1" bit
sequences are generated when errors are detected within a frame
(e.g. an incorrect checksum). These sequences, instead of the frame
data, are provided for the BER measurement and signalize that the
frame in question should not be used for the measurement.
The instrument ignores sequences of 32 bits or longer.
4.80 E-3