• Home
  • Comtech EF Data CRS-400 1:N Modem Redundancy Switch

Comtech EF Data CRS-400 1:N Modem Redundancy Switch

(0) No Reviews yet
  • 1:N Redundancy for Legacy Modems
  • Fully protection of traffic circuits
  • Primarily for Hub applications
  • Twin AC power supplies


General Specifications
Type1:N Redundancy Switch system, N = 8 max,

bridging architecture.
Operating ModesFully automatic or manual

Force redundant modem to bridge traffic modem

Select traffic modem as active or inactive. Select

inactive to bypass any switching actions for the

specific modem set.

Programmable hold-off to backup and ho
Redundant Channel SignalAny one of the 8 traffic paths, both RX IF, and TX
Switching ConditionsIndependent or dependent switching of prime to

back-up following a modulator or demodulator fault.
IF SwitchingSwitch controls TX Carrier On/Off state for each

modem. External splitters and combiners are required.

Optional CRS-280 70/140 IF Switch for

multitransponder operation.
Switching Time15 seconds max (with hold-off time set to 2)
Data InterfacesHSSI, female SCSI-2 type connector

G.703, BNC female connector
Front PanelVacuum fluorescent display, 2 lines, 24 characters

Tactile keypad

LED system status display showing, for all

channels: Unit Status, On-line/Off-line Status,

Bridge Status
Audible AlarmMay be turned on or off, extra relay available
Common FaultsDry relay contacts
Power SupplyTwo independent inputs:

100 to 250 volts AC, Auto-Sensing

Fused IEC connectors, 25 Watts max
Dimensions4U chassis, 10.8 in. deep (275 mm)
Weight18.5 lbs. (8.4 kg.)
Modems SupportedSDM-2020
Monitor & ControlAll switch functions via front panel or remote

EMC and Safety StandardsEN 55022 CLASS B, Conducted and radiated


EN 50082-1, Radiated electromagnetic field

immunity EN 60950, Standard for Safety requirements of

Information Technology Equipment

FCC Part 15 Class B
EnvironmentalOperating temperature range 0 to 40° C
CRS-280 IF Switch (Optional)
Frequency70 / 140 MHz
Connector TypeTransmit and receive: BNC female
Impedance Standard75 Ohm
Optional50 Ohm
Typical IF Switch LossTransmit loss 0.5 dB.

Receive loss 4 dB (power divider)
PowerFrom CRS-400
Dimensions and Weight4U chassis

2.0 in. deep (275 mm)

5 lbs. (2.2 kg.)
EnvironmentalOperating temperature range 0 to 40° C

Ratings & Reviews

No reviews available

Be the first to Write a Review