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SLM-3650 Satellite Modem
Theory of Operation
TX
OVERHEAD
BASEBAND
LOOPBACK
TX TERR
DATA
RXTERR
DATA
SCT
EXT
TXCLK
HI STAB
RX OVERHEAD
BACKWARD
ALARMS
MODEM FAULTS
(FORM C)
MODEM FAULTS
(TTL)
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OVERHEAD
RECEIVERS
P
ROCESSORS
LINE
RECEIVERS
TX
CLOCK
MUX
SCT
EXT
LINE
PLESIOCHRONOUS
DRIVERS
BUFFER
RXCLK
OVERHEAD
PROCESSORS
RX
CLOCK
MUX
LINE
DRIVERS
BWA
RELAY
FORM
C
DRIVERS
RELAYS
FLT
RELAY
FORM C
DRIVERS
RELAYS
TTL
DRIVERS
Figure 4-4. Interface Block Diagram
4–20
INTERFACE
LOOPBACK
TX
OVERHEAD
MUX
RS CODEC
DROP/INSERT
RX
OVERHEAD
DEMUX
MICRO-
CONTROLLER
Revision 3
MN/SLM3650.IOM
TXSAT
DATA
RXSAT
DATA
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