SLM-3650 Satellite Modem
Revision 3
Options
MN/SLM3650.IOM
A–25
The Doppler buffer receives data clocked by the overhead clock from the Demod and an
enable line from the DEMUX. The data is stored in RAM. Four options are allowed to
clock the data out of the buffer:
•
TX
•
RX
•
Internal
•
External
Based on this selection, terrestrial data is clocked out of the buffer to the selected drivers
and on to the end user.
A.1.4.3.6
Loop Timing Operation
A loop timing option is provided. When loop timing is selected, the Doppler buffer
output clock is forced to the RX clock by the M&C. An M&C-controlled MUX switches
the Send Timing (ST) pin to output the RX clock. The RX clock is sent out the ST pin to
the appropriate interface drivers and on to the user. The operator is left with the option of
clocking terrestrial data into the MUX on the transmit side with either the external clock
source Terminal Timing (TT) or the internal clock source. The internal clock source is
the same as the ST pin.
A.1.4.3.7
Baseband Loopback Operation
A baseband loopback option is provided. When selected, the input terrestrial data and
clock from the operator are looped back to the user as the output terrestrial data and
clock.
The terrestrial data and clock output from the DEMUX are also looped to the terrestrial
data and clock input at the MUX.
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