beautypg.com

Sms-451a/e local control, Sms-451a/e modulator operation – Comtech EF Data SMS-451 User Manual

Page 49

background image

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.