User's Guide

Appendix B: 75-Ohm CATV Cable
Page 16 InterReach Spectrum Remote Access Unit Installation Guide
©
2010 ADC Telecommunications, Inc ADCP-77-168 • Issue 1 • 09/2010
APPENDIX B: 75-OHM CATV CABLE
The 75-Ohm CATV Cable:
• connects the IFEU to MRAU(s) and the MRAU(s) to the SRAU(s)
• transmits (FWD) multiband and receives (REV) IF signals
• delivers DC electrical power to the RAUs. The Spectrum IFEU DC voltage output
is 54VDC nominal. If the IFEU reaches its current limit, a current-limiting circuit
protects it.
• carries configuration and status information
• uses 75 type-F connectors with captive centerpins.
CATV Cable Requirements
Belden CATV cable or equivalent is required (see Figure 2).
• For the RG-6 cable, use a Belden 1695A Coax.
• For the RG-11 cable, use a Belden 7732A Coax.
NOTE: ADC requires solid copper center conductor CATV cable for proper DC voltage to the RAU
and maximum distances.
Figure 2. Belden 1695A and 7732A Coax Cables
• Use RG-6 or RG-11 CATV cable between the IFEU and MRAU, the typical
lengths of which are listed below.
Cable Type
Minimum Length Maximum Length
Meters Feet Meters Feet
RG-6 0 0 140 459
RG-11 0 0 200 656
RG-11
Belden 1695A Coax
RG-6
Belden 7732A Coax