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Comtech EF Data SMS-301 Modem Protection Switch

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  • Fully programmable 1:1 protection switch
  • Front panel or remote programming
  • Automatic and manual control
  • Easy installation


General Specifications
Data InterfaceEIA-232, V.35, EIA-422, G.703, and

Data Rate20 Mbit/s (max.)
IF Interface impedance75 Ohms BNC (50 Ohms optional)
IF Frequency50 to 180 MHz
Operation ModesAuto/manual, local/remote
Power90 to 264 VAC, 47 to 63 Hz, 30W max.
Size19 inch W x 15.2 inch D x 1.75 inch H (1 RU)

48.2 x 38.6 x 4.4 cm)
Weight9 lbs. max.(4.0 kg)
ModulatorA/B online select or auto
DemodulatorA/B online select or auto
Power Supplies1, 2 on
ModeAutomatic or manual
ModulatorA/B online
DemodulatorA/B online
FaultsTransmit, receive, system, and stored
Remote Monitor and9-pin D sub connector, EIA-232 or EIA-485
Control(2- or 4-wire), front panel selectable
Monitor and Control
Serial InterfaceEIA-232 or EIA-485, programmable
Baud Rate150 to 19200 bit/s, programmable
Parameters ControlledStart/stop, parity, data bits

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