
CRS-180 70/140 MHz IF 1:1 Redundancy Switch MN/CRS180.IOM
Introduction Revision 11
1–14
1.4 Summary of Specifications
Comtech EF Data, Tempe, Arizona
Modems Supported
• CDM-625A Advanced Satellite Modem
• CDM-625 Advanced Satellite Modem
• CDM-760 Advanced High-Speed Trunking Modem
• CDM-750 Advanced High-Speed Trunking Modem
• CDM-570A 70/140 MHz Satellite Modem (with/without Optional IP Packet
Processor)
• CDM-570 70/140 MHz Satellite Modem (with/without Optional IP Module)
• CDM-710G 70/140 MHz High-Speed Satellite Modem
• CDM-710 70/140 MHz Broadcast Satellite Modem
•
CDM-700 70/140 MHz Satellite Modem
• Fully Automatic under control of supporting 1:1 switch.
•
Manual under control of supporting 1:1 switch.
• Full bridging architecture with configuration synchronization.
• Tx switching guarantees the Offline modem is muted at least 60 dB down.
•
Rx IF signal fed to both Online and Standby units.
Tx/Rx switching follows state of supporting data switching via control input from data
switch.
Splitting
• Tx IF: Switched by RF relay (1.5 dB max loss, 40 dB min ON/OFF isolation)
• Rx IF: Passive power splitting (4dB max loss)
Optimized for 50Ω (> 10 dB return loss on external IF ports), 75Ω supported with the
use of external RF transformers (included).
Ω
Excluding connectors: 1.7 H x 5.7 W x 4.1 D inches (43 H x 143 W x 104 D mm)
Optional 19-inch rack mounting kit available (CEFD P/N KT/11708)
+12 volts DC @ 80 mA (max)
(Power supplied by modems)
• EMC
•
Safety
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