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Comtech EF Data SMS-458B 1:N Modem Protection Switch

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  • 1:N Configuration
  • 50 to 180 MHz IF Switching
  • Handles up to 4 downlinks
  • In-service repairability


General Specifications
Frequency Range50 to 180 MHz
Impedance at Ports75 Ohms
Return Loss> 15 dB
Isolation> 60 dB
Online ModemsExpandable from 1 to 4
Data InterfaceG.703, MIL-STD-188, 32 to 45 Mbit/s (G.703)

13 Mbit/s (MIL-STD-188)
Power90 to 264 VAC, 47 to 63 Hz, 40W max

(-48 VDC optional)
Size19W x 22D x 12.25H inches (7 RU)

(48.2W x 55.8D x 31H cm)
Weight50 lbs (22.7 kg)
Prime Modulator to Output< 1 dB
Backup Modulator to Prime Output< 1 dB
Any Downlink to Backup Demodulator< 1 dB
Backup ModulatorWithin ±0.25 dB primary when switched online.
Switchover Priority1 of 3 independent levels for Mod and Demod.
Remote M&C InterfaceEIA-485 or EIA-232
ControlsControl of all modem functions via front panel

and remote control port
Operation ModesAuto, Local, Remote, and Bypass.

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