Figure 4-10. prime idr interface switch, Figure 4-11. backup idr interface switch – Comtech EF Data SMS-758 User Manual

Page 93

Text mode
Original mode

SMS-758 Modem Protection Switch

Theory of Operation

MN/SMS758 Rev. 3

4–33

TRANSMIT DATA

TRANSMIT ESC

RECEIVE DATA

RECEIVE EXTERNAL

REFERENCE CLOCK

RECEIVE ESC

TX S/B

PRIME C/U

DATA I/O

TERRESTRIAL

DATA I/O

RX S/B

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.

TRANSMIT DATA

RECEIVE DATA
RECEIVE ESC

TRANSMIT ESC

RECEIVE EXTERNAL

REFERENCE CLOCK

MOD AND DEMOD FAULTS

DATA SWITCH

MOTHERBOARD

INSTRUCTION

DECODER

MOD RELAYS

DEMOD RELAYS

FAULTS

TRANSMIT DATA

TRANSMIT ESC

RECEIVE DATA
RECEIVE ESC
RECEIVE EXTERNAL

REFERENCE CLOCK

Figure 4-10. Prime IDR Interface Switch

TRANSMIT DATA

TRANSMIT ESC

RECEIVE DATA

RECEIVE ESC

RECEIVE EXTERNAL REFERENCE CLOCK

MOD AND DEMOD FAULTS

BACKUP C/U
DATA I/O

DATA SWITCH
MOTHERBOARD

Figure 4-11. Backup IDR Interface Switch