Instrument Function
R&S
®
SMU200A
187Operating Manual 1007.9845.32 ─ 15
ment wait as long as data is not enabled. If the data is enabled, the measurement is
continued.
The figure shows a TDMA signal with user data that contains the PRBS data sequence
and various check fields which should be ignored for the bit error rate measurement.
Below that are the associated clock and "Data Enable" signals.
"Not Used"
Any signal at the "Data Enable" input is ignored; all data at the BERT
data input is used for the measurement.
"High"
The "Data Enable" signal is used. The only data measured is the data at
the BERT data input during a high level of the "Data Enable" signal. The
measurement is interrupted during a low level of the "Data Enable" sig-
nal.
"Low"
The "Data Enable" signal is used. The only data measured is the data at
the BERT data input during a low level of the "Data Enable" signal. The
measurement is interrupted during a high level of the "Data Enable" sig-
nal.
SCPI command:
:BERT:SETup:DENable on page 517
Pattern Ignore
Activates/deactivates ignoring of pure "0" or "1" bit sequences at least 32 bits long. Acti-
vating "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 (e.g. an incorrect checksum) are detected within a frame. These sequences,
instead of the frame data, are provided for the BER measurement and signal that the
frame in question should not be used for the measurement.
The R&S Signal Generator ignores sequences of 32 bits or longer.
Note: While ignoring the bits, the PRBS generator for the BER measurement keeps run-
ning. 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.
Bit and Block Error Rate Measurements - BERT Block
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