Comtech EF Data SMS-758 - Manual (Page 89)

SMS-758 Modem Protection Switch Theory of Operation
MN/SMS758 Rev. 3 4–29
DATA PATH
SELECTION
TRANSMIT DATA
RECEIVE DATA
RECEIVE EXTERNAL REFERENCE CLOCK
MOD AND DEMOD FAULTS
DECODER
INSTRUCTION
BACKUP
DATA I/O
DATA SW ITCH
MOTHERBOARD
MOD RELAYS
DEMOD RELAYS
Figure 4-9. Backup DS-1 and G.703 Interface Switch