Comtech EF Data CRS-311 Installation And Operation Manual page 163

1:1 redundancy switch, accessory product for use only with comtech ef data cdm-qx/qxl and slm-5650/5650a modems (modem firmware and hardware requirements apply)
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CRS-311 1:1 Redundancy Switch
Appendix A
A.4.7
IF Cable, BNC (50Ω)
Use the 50Ω BNC IF Cable (Figure A‐18) to connect the CRS‐311's CRS‐281 (70/140 MHz) IF Switch to the Redundant and Traffic Modems. 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
Figure A-18. IF Cable, BNC 50Ω for CRS-281 (70/140 MHz) IF Switch (CEFD P/N PL/0946-1)
A-21
Revision 7
MN/CRS311.IOM

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