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Comtech EF Data CDS-100 Diversity Switch

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  • Companion product for most Comtech CDM-series modems
  • Manual and automatic switchover
  • User selectable Faults
  • Great operational flexibility


CDS-100 Specifications
Operating Modes
  • Fully automatic switchover
  • Manual switchover (via the front panel of the online modem, or via the modem’s remote control interface)
  • Optional external fault inputs can be used to control switchover
  • TX clock and data signals fed to both online and standby units (uses ‘Y’ cable for supported interface types)
  • Continuous fault comparison of online and standby units
  • The configuration of online and standby units is synchronized via the Auxiliary Serial link between the two modems
Switchover Time Within 0.1 seconds (typical) after fault detection
Fault Detection Time 0.5 seconds (maximum)
Control inputs A and B modems connect via 9-pin D-sub male connectors
External Fault inputs A and B external faults connect via 9-pin D-sub female connectors
External Fault input characteristics For each A and B fault connector there are three inputs:
  • 2 inputs requiring, for fault activation:
    • 5 volt CMOS logic ‘0’, or external relay closure to ground
  • Or 1 input requiring, for fault activation:
    • 5 – 15 volt voltage
Unused inputs default to the non-failed state, and all external faults are logically ‘OR’ed together
Dimensions (H x W x D) 1.7” x 5.7” x 4.1”

(4.3 x 14.3 x 10.4 cm)
Weight 1.1 lbs (0.5 kg)
Power Requirements +12 VDC @ 80 mA (max.) – provided by the two modems
Approval CE

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