Cabling To The Cdm-750; Modem-To-Switch Control And If Interface Connection - Comtech EF Data CRS-180 Installation And Operation Manual

CRS-180 70/140 MHz IF 1:1 Redundancy Switch
Cables and Connections
4.3

Cabling to the CDM-750

1. For information on the CDM‐750's 1:1 auto‐enable functionality, see:
• Chapter 3. MODEM AND SWITCH CONFIGURATION
• CDM‐750 Advanced High‐Speed Trunking Modem Installation and Operation
2. For information on the cables and cable assemblies specified in this section, see:
• Appendix A. CABLE DRAWINGS
4.3.1

Modem-to-Switch Control and IF Interface Connection

Figure 4‐15 shows the control and IF connections for the CDM‐750 to the CRS‐180. All control and
IF components are provided for the CDM‐750 in the KT‐0000188 CRS‐180 70/140 MHz IF 1:1
Redundancy Kit.
Note the following:
1. Use of the XF/BNC‐MF‐50‐75 transformers (Item 2) on the antenna side Rx (J7) and Tx (J8)
connectors are required only when the user supplies a 75Ω Rx/Tx antenna connection.
2. Use of the XF/BNC‐MF‐50‐75 transformers (Item 2) on the switch‐to‐modem side Rx (J1, J2)
and Tx (J5, J6) connectors are always required in order to accommodate the CDM‐750's 75Ω
Rx/Tx operability.
Manual (CEFD P/N MN‐CDM750)
4–15
Revision 8
MN/CRS180.IOM