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Comtech EF Data SMS-758 User Manual

Page 102

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Theory of Operation

SMS-758 Modem Protection Switch

4–42

MN/SMS758 Rev. 3

DATA PATH

SELECTION

TRANSMIT DATA

TRANSMIT ESC

RECEIVE DATA

RECEIVE ESC

RECEIVE EXTERNAL REFERENCE CLOCK

MOD AND DEMOD FAULTS

DECODER

INSTRUCTION

BACKUP
DATA I/O

DATA SWITCH
MOTHERBOARD

MOD RELAYS

DEMOD RELAYS

Figure 4-15. Backup 2:N IBS Interface Switch (1694)