Operation
SMS-758 Modem Protection Switch
3–18
MN/SMS758 Rev. 3
HAS THE
VERIFY TIMER
TIMED OUT?
VERIFY THE
CONFIGURATION
OF THE NEXT DMD.
(SERIAL REMOTE
NOT AVAILABLE)
YES
ARE ANY
PRIMES
FLT’D?
ARE THE
B/U (s) ON
STAND-BY?
ARE THE
FLT’D
PRIMES
B/U’D?
PUT FLT’D
PRIMES IN PRIORITY
ORDER. START WITH
HIGHEST PRIORITY.
IS THIS
FLT’D
PRIME B/U’D?
IS A
B/U
AVAILABLE?
IS
THE B/U
ON STAND-BY
FOR THIS
PRIME?
VERIFY B/U
CONFIGURATION.
UPDATE IF
NECESSARY.
(SERIAL REMOTE
NOT AVAILABLE)
IS THE
B/U DMD
FLT’D?
HAS THE
SWEEP TIMER
TIMED OUT?
ARE
OTHER
PRIMES
FLT’D?
ARE
ANY
FLT’D PRIMES
NOT B/U’D?
PROGRAM B/U (s)
FOR HIGHEST
PRIORITY CHANNEL(s).
(SERIAL REMOTE NOT
AVAILABLE)
PLACE B/U (s) IN
STAND-BY MODE.
INDICATE WITH “-” ON
FRONT PANEL
IS A
LOWER
PRIOIRTY PRIME
B/U’D?
IS A
NON-FLT’D
PRIME B/U’D?
PROGRAM B/U
WITH THE
CONFIGURATION
FOR THIS PRIME.
(SERIAL REMOTE
NOT AVAILABLE)
WAIT FOR ALL
APPLICABLE TIMERS.
INDICATE PRIME
WITH “#” ON
FRONT PANEL
IS THE
PRIME STILL
FLT’D?
PLACE B/U ON-LINE
FOR FLT’D PRIME.
INDICATED PRIME
WITH “->“ ON
FRONT PANEL.
GO TO NEXT
FLT’D PRIME IN THE
PRIORITY ORDER.
ARE ALL
PRIME DMDS
FLT’D?
SET ALL DMDS
FLT’D FLT. (BACK
PANEL RELAY)
SET THE DMD
OPERATION FLT.
(FRONT PANEL
LEDS.)
DEMOD AUTO MODE
NO
NO
YES
NO
YES
YES
NO
NO
NO
NO
YES
YES
YES
NO
YES
NO
NO
YES
YES
YES
YES
NO
NO
YES
YES
NO
YES
NO
NO
Figure 3-3. SMS-758 Switching Algorithm Flow Chart
(Demodulator and Modem)
