Comtech EF Data SMS-451 - Manual (Page 47)

3-1
Chapter 3. OPERATION
This chapter provides operation procedures for the switch.
3.1 Overview
Note: In the event of power loss to the switch (Figure 3-1), the relays that connect data
will be switched to the “A” position for the modulator and the demodulator. The
modulator RF will also be connected to position “A.”
Power supply operation is indicated when the PWR 1 and PWR 2 green LEDs (on the
front panel) are illuminated. The switch is designed to operate on one power supply;
redundant power supplies are provided for maximum protection.
SMS-451T Only: Operation of the switch is controlled by the SMS-451A switch
via the remote control connector. There must be an SMS-451A Switch in the
system to operate the SMS-451T switch. The SMS-451T Switch tracks the SMS-
451A Switch for all switching functions. The primary function of the SMS-451T
Switch is to add ESC switching capabilities to the SMS-451A Switch.