Configuring the Internal Baseband Source
R&S
®
SMW200A
271User Manual 1175.6632.02 ─ 16
[:SOURce<hw>]:BB:DM:CLISt:COPY on page 916
[:SOURce<hw>]:BB:DM:CLISt:DELete on page 914
Receiver State
Indicates the current state of the receiver of the external data. The displayed informa-
tion is useful in erroneous situations.
"Off"
Indicates that the baseband is not active.
"Operational"
Indicates a normal operation; the data is received with the expected
data rate.
"Overflow"
Data rate is too high for correct processing; symbols have been lost.
This indication is displayed as long as the signal is not restarted.
Tip: Try out the following:
●
Check the data rate of the input signal.
●
Provide the data source and the R&S SMW with a common exter-
nal reference signal.
See Chapter 7.4, "Reference Oscillator", on page 441.
●
Provide an external clock signal to the R&S SMW.
See "Clock Source" on page 260.
●
Avoid reflections on the data and clock lines.
The R&S SMW can interpret reflections on the data and clock
lines as extra clock edges.
"Underflow"
Data rate is too low or data is missing; zero symbols have been inser-
ted.
This indication is displayed as long as the signal is not restarted.
Tip: Try out the following:
●
Check that the data and clock cables are connected to
R&S SMW.
●
Check the data rate of the input signal.
●
Provide the data source and the R&S SMW with a common exter-
nal reference signal.
See Chapter 7.4, "Reference Oscillator", on page 441.
●
Provide an external clock signal to the R&S SMW.
See "Clock Source" on page 260.
●
Check the value of the parameter Local Connector Settings >
Threshold Clock.
If the configured threshold is higher than the signal's "high" volt-
age, the signal is not detected.
Remote command:
[:SOURce<hw>]:BB:DM:SMODulation:RCVState? on page 897
Settings for Data Source = External
(Requires R&S SMW-B10)
Symbol Clock Slope/Clock Slope ← Settings for Data Source = External
A higher bit modulation extern serial data requires a reference symbol clock signal to
generate a bit clock out of it.
Generating Custom Digital Modulated Signals
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