Comtech EF Data SMS-451 - Manual (Page 49)

SMS-451 Satellite Switch Revision 0
Operation MN/SMS451.IOM
3-3
3.3 SMS-451A/E Local Control
Note: All local controls are located on the front panel of the switch.
3.3.1 SMS-451A/E Modulator Operation
To operate the switch from the front panel, REM/LOC must be set to the LOC position.
1. Manually force Modulator “A” online by switching the modulator switch to the
“A” position. The yellow MANUAL LED and the green ONLINE “A” LED
will light.
2. Manually force Modulator “B” online by switching the modulator switch to the
“B” position. The yellow MANUAL LED and the green ONLINE “B” LED
will light.
Notes:
1. The AUTO position will allow the switch to automatically backup the faulty
modulator, which will be indicated by a red FAULT LED on the front panel.
2. In the event that both modulators are in fault condition, the switch will
remain on the last known operational modulator if independent modem-
switching firmware is installed. The switch will default to “A” if dependent
modem-switching firmware is installed.