Atec Rohde-Schwarz-SMJ100A - Manual (Page 31)

Version 05.00, December 2007 R&S ® SMJ100A Vector Signal Generator 31
Other options
BER measurement (R&S ® SMJ-K80 option)
The data supplied by the DUT is compared with a reference pseudo-random bit sequence.
Clock supplied by DUT; a clock pulse is required
for each valid bit
Clock rate 100 Hz to 60 MHz
PRBS
sequence length 9, 11, 15, 16, 20, 21, 23
pattern ignore OFF, all 0, all 1
data enable external
modes OFF, high, low
restart external
Data
modes ON/OFF
Synchronization time 28 clock cycles
Interface 9-pin D-Sub connector, D-Sub/BNC cable supplied with option
input impedance
1 k Ω, 50 Ω
trigger threshold
setting range 0 V to 2.50 V
Clock, data, enable, and restart inputs
resolution 0.01 V
Polarity data, clock, data enable normal, inverted
Measurement time selectable by means of maximum number
of data bits or bit errors (max. 2
31 bit
each), continuous measurement
Measurement result if selected number of data bits or bit errors
is attained BER in ppm, %, or decade values
Status displays not synchronized, no clock, no data
BLER measurement (R&S ® SMJ-K80 option)
In BLER measurement mode, arbitrary data can be provided by the DUT. A signal marking the block’s CRC has to be provided on the
data enable connector of the BER/BLER option.
Clock supplied by DUT; a clock pulse is required
for each valid bit
Clock rate 100 Hz to 60 MHz
input data arbitrary
data enable (marking the block’s CRC) external
Data
modes high, low
CRC type CCITT CRC16 (x 16 + x 12 + x 5 + 1) CRC
CRC bit order MSB first, LSB first
Synchronization time 1 block
Interface 9-pin D-Sub connector, D-Sub/BNC cable supplied with option
input impedance
1 k Ω, 50 Ω
trigger threshold
setting range 0 V to 2.50 V
Clock, data, and enable inputs
resolution 0.01 V
Polarity data, clock, data enable normal, inverted
Measurement time selectable by means of maximum number of received blocks or errors (max. 2 31 blocks
each), continuous measurement
Measurement result if selected number of received blocks or
errors is attained BLER in ppm, %, or decade values
Status displays not synchronized, no clock, no data