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SMS-758 Modem Protection Switch
TRANSMIT DATA
TRANSMIT ESC
RECEIVE DATA
RECEIVE ESC
RECEIVE EXTERNAL
REFERENCE CLOCK
TERRESTRIAL
DATA I/O
NOTE: THE RELAYS ARE SHOWN IN THE NON-ENERGIZED
POSITION CONNECTING THE TERRESTRIAL DATA AND
PRIME MODEM CONNECTORS TOGETHER. STANDBY (S/B)
SIGNALS ARE ROUTED TO THE OFFLINE BACKUP MODEM.
MN/SMS758 Rev. 3
RX
Figure 4-12. Prime 2:N IDR Interface Switch (1877)
TX S/B
TX
TX
RX
RX
RX S/B
TRANSMIT DATA
TRANSMIT ESC
RECEIVE DATA
RECEIVE ESC
RECEIVE EXTERNAL
REFERENCE CLOCK
MOD AND DEMOD FAULTS
TX RELAYS
RX RELAYS
Theory of Operation
TRANSMIT DATA
TRANSMIT ESC
RECEIVE DATA
RECEIVE ESC
RECEIVE EXTERNAL
REFERENCE CLOCK
FAULTS
PRIME C/U
DATA I/O
DATA PATH
SELECTION
INSTRUCTION
DECODER
DATA SWITCH
MOTHERBOARD
4–37
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