Rohde & Schwarz SMU200A - Bert:setup:type; Bler:setup:type

Remote Control Commands
R&S
®
SMU200A
520Operating Manual 1007.9845.32 ─ 15
Parameters:
0|1|OFF|ON
OFF
The reset signal for the BER measurement is generated internally.
This setting is suitable for PRBS sequences that run continuously
and thus ensure uninterrupted repetition.
ON
The reset signal for the BER measurement is fed via the Restart
input of the BERT interface.
If the PRBS sequence cannot be continued uninterruptedly, the
BER measurement must be stopped at the end of the data
sequence and subsequently restarted at the beginning of the new
data sequence. The measurement is stopped and started via a
0-1-0 slope of the Restart signal. A transition from logic 0 to 1
causes a partial result to be generated and the measurement to
be stopped. A transition from 1 to 0 starts the measurement for the
next subinterval. This measurement is synchronized anew. If the
R&S Vector Signal Generator is used as a data source, a signal
in which a single 1 was coded at the end of the data sequence can
be used as a restart signal at the R&S Vector Signal Generator
marker output. This causes the BER measurement to stop briefly
at the end of the data sequence and start again.
Partial results (number of data and error bits) are added up until
the predefined total number of data or error bits is reached or
exceeded.
The measurement is reset byPattern Ignore or Data Enable,
regardless of its status.
OFF
<State>
*RST:
BERT:SET:REST:STAT ON
The external signal restarts the measurement.
Example:
:BERT:SETup:TYPE <Type>
Selects the PRBS sequence. The data generated by the PRBS generator is used as a
reference for the measurement.
Parameters:
PN9 | PN11 | PN15 | PN16 | PN20 | PN21 | PN23
PN9
<Type>
*RST:
BERT:SET:TYPE PN15
sets a pseudo random binary sequence consisting of 32767 bits.
Example:
:BLER:SETup:TYPE?
Queries the CRC polynomial used. CCITT CRC 16 : G(x) = x
16
+ x
12
+ x
5
+ x
1
is the CRC
polynomial supported.
BERT and BLER Subsystems