CDS-100 Diversity Switch

Comtech EF Data

CDS-100 Diversity Switch

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  • CDM-570/570L
  • CDM-625/625A
  • CDM-700
  • CDM-710/710G
  • CDM-750

SKU: CMT120 Tags: , ,
  • Description
  • Technical Specifications
  • Support Documents


Switched diversity systems are those employing two (or sometimes more) antennas for the purpose of maintaining a communications link should the signal from one of those antennas become blocked, or severely degraded. In satellite communications, a switched diversity system is frequently employed in situations where:

  • The ground station is mobile (such as a ship) and direct line-of-sight is blocked by buildings, bridges, fjords, etc.
  • The ground station is fixed, but where there is frequent blockage of an antenna (such as an oil drilling platform, where helicopter traffic interrupts the line-of-sight view to the satellite)


The Comtech EF Data CDS-100 Diversity Switch is a companion product for the following modems:

  • CDM-570/570L
  • CDM-625/625A
  • CDM-700
  • CDM-710/710G
  • CDM-750

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
Architecture • 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 (height x width x depth) 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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