Comtech EF Data SMS-758 User Manual
Page 69
SMS-758 Modem Protection Switch
Theory of Operation
MN/SMS758 Rev. 3
4–9
Table 4-5. Relay-Remote Command Functions
Function
Description
AUTO
Executed only from REMOTE mode. This function places the switch in
the automatic mode of operation.
REMOTE
Executed from any operating mode other than REMOTE; must be
executed before any other relay-remote function. This function places
the switch in the remote mode of operation.
BACKUP MOD 1
Executed only from REMOTE mode. This function is used to place
backup modulator 1 online when it precedes a target word, or offline
when it precedes EXECUTE.
BACKUP MOD 2
Executed only from REMOTE mode. This function is used to place
backup modulator 2 online when it precedes a target word, or offline
when it precedes EXECUTE.
BACKUP DEMOD 1
Executed only from REMOTE mode. This function is used to place
backup demodulator 1 online when it precedes a target word, or
offline when it precedes EXECUTE.
BACKUP DEMOD 2
Executed only from REMOTE mode. This function is used to place
backup demodulator 2 online when it precedes a target word, or
offline when it precedes EXECUTE.
Table 4-6. Relay-Remote Command Examples
Input Lines
Command Words
Rem3
Rem2
Rem1
Rem0
Comments
START
C
C
C
C
Places the M:N in the remote
REMOTE
N
N
N
C
mode.
EXECUTE
C
C
N
N
START
C
C
C
C
Places B/U modulator 1 online for
B/U MOD 1
C
C
N
C
prime 2.
TARGET PRIME 2
N
N
C
N
EXECUTE
C
C
N
N
START
C
C
C
C
Places B/U modulator 2 online for
B/U MOD 2
C
C
C
N
prime 6.
TARGET PRIME 6
N
C
C
N
EXECUTE
C
C
N
N
START
C
C
C
C
Places B/U demodulator 1 online
B/U DEMOD 1
C
N
N
C
for prime 5.
TARGET PRIME 5
N
C
N
C
EXECUTE
C
C
N
N
START
C
C
C
C
Place B/U demod 2 offline.
B/U DEMOD 2
C
N
C
N
(No target word.)
EXECUTE
C
C
N
N
START
C
C
C
C
Places the M:N in the auto mode.
AUTO
N
N
C
N
EXECUTE
C
C
N
N
C = Change of state. N = No change of state.
Mod = Modulator. Demod = Demodulator.