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Comtech EF Data CRS-150 Modem Redundancy Switch

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  • Supports a variety of modems
  • Fully protects traffic paths
  • User defined switchover conditions
  • Extensive flexibility


Comtech CRS-150 General Specifications
Equipment Type1:1 Redundancy Switch
Modems SupportedComtech EF Data CDM-600 Digital Satellite Modem
Operating ModesFully Automatic

Manual (via the front panel of the Online Modem, or via the Modem?s remote control interface)
ArchitectureFull bridging architecture, with configuration synchronization

Tx Clock and Data signals fed to both Online and Standby units

Rx IF signal fed to both Online and Standby units 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)
Switch ConditionsSwitchover initiated following:

Unit faults only, or:

Unit faults or Receive Traffic Faults, or:

Unit faults or Transmit Traffic Faults, or:

Unit faults or Receive or Transmit Traffic Faults
Fault Detection Time1 second maximum
Switchover TimeWithin 0.5 seconds of fault detection
Main Data InterfacesRS422/EIA530 DCE (25 pin D-type female, pinout per EIA530) to 10 Mbps

V.35 DCE to 10 Mbps

Synchronous RS232 to 300 kbps

Serial LVDS to 20 Mbps

(A standard HSSI interface is provided with the addition of the Comtech EF Data CIC-20 LVDS/HSSI Interface Converter module, for operation up to 20 Mbps)
G.703 InterfacesG.703, T1, E1, T2 and E2, balanced and unbalanced (BNC connectors for 75 ohms unbalanced, and 15 pin D-type for 120 ohms balanced) Note that for T1 and E1 Drop and Insert applications the unit supports Rx, Tx connections, as well as Drop Data Out (DDO) and Insert Data in (IDI)

'G.703-like'signals at 512 kbps and 1025 kbps

(through DDO and IDI ports)
Overhead InterfaceIntelsat IESS-308/309/310 Open Network overhead signals, including:

IDR Overhead Data Channels (64 kHz, 8kHz, and Octet clocks)

IBS ESC and High-Rate ESC

Balanced External Reference Input

IDR Backward Alarm Inputs

(25 pin D-type male)
Audio2 x 4-wire 600 ohms audio interface, per Intelsat IESS-308 (9 pin D-type female)
IDR Backward AlarmsBackward Alarm Outputs BA-1 through BA-4 (Form C relays) per Intelsat IESS-308 (15 pin D-type female)
External Reference75 ohms BNC, unbalanced input

120 ohms balanced input
IF Switching/SplittingTransmit IF: Switched by RF relay (0.3 dB max loss)

Receive IF: Passive power splitting (3.5 dB max loss)
IF ImpedanceOptimized for 50 ohms(> 20 dB return loss on external IF ports)

75 ohms supported with the use of external RF transformers (supplied)
IF ConnectorsBNC female
IF Frequency Range52 - 176 MHz
Weight4.6 lbs (2.1 kg)
Dimensions1.75 inches (44.5 mm) high, 19 inches (482.5 mm) wide,

4.2 inches (107 mm) deep (excluding connectors)
Power Requirements4.5 Watts maximum

+ 12 volts DC @ 250 mA (max)

-12 volts DC @ 120 mA (max)

Power is supplied by the Online and Standby Modems, and the unit current shares when both an >A= and >B= unit are present. These power supplies are electronically fused and protected.

A pair of auxiliary DC inputs are provided for powering external equipment connected to the main data interface, such as a CIC-20 Interface Converter
Approvals'CE' as follows:

EN 55022 Class B (Emissions)

EN 50082-1 (Immunity)

EN 60950 (Safety)

FCC Part 15 Class B

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