Comtech EF Data CRS-500 - Manual (Page 57)

4–1
Chapter 4. CABLES
AND
CONNECTIONS
4.1 Introduction
All cables used for interconnecting CRS-500 1:N Redundancy System components and modems
are available from Comtech EF Data. You can order these cables at the same time as placing the
order for the CRS-500.
Leave the CRS-500 and all modems powered OFF until all connections are ready.
Once the CRS-500 components and all the modems have been mounted, you must properly attach
all required cabling. In most cases, the modem accepts the male end of the cable while connectors
on the RMI or TMI module installed at the rear panel of the CRS-500 Data Switch Unit (DSU) accept
the female end of the cable in the section of the module labeled “Modem Interface.”
If fabricated by the customer, the cables required between each modem and Switch plug-in RMI
or TMI module should be of shielded, twisted-pair construction, with the grounded shield
bonded to the back shell. All data cables should be wired correctly using the connector and
pinout information provided in Appendix A. CABLE DRAWINGS or Appendix B. CONTROLLER
AND TMI CONNECTORS AND PINOUTS.
Illustrations featured in this chapter provide cabling configuration examples for RMI or TMI
interfaces – i.e., the interconnection of the Redundant Modem to a CRS-500 DSU-mounted RMI
module, or the interconnection between a CRS-500 DSU-mounted TMI module and a Traffic
Modem. Refer to Sect. 1.3.2 Data Switch Unit (DSU) for detailed information on these
interfaces.
The step-by-step process for connecting a variety of CRS-500 DSU and modem configurations is
outlined in this chapter (in-depth content is provided in each chapter subsection) as follows:
Sect. Description For (Connections)
4.2 CRS-500 Control Connections
Basic (CSU DSU)
Optional (CSU DSU CRS-282xx ISU)
4.3 Modem Connections Modem-specific cabling connections: Control, Comms, Traffic, etc.
4.4 CRS-282xx IF Cable Connections Same band/multi-band single or dual ISU configuration
4.5 CRS-500 Power Connections Switch and modem power connections