Comtech EF Data CRS-180 - Manual (Page 93)

CRS-180 70/140 MHz IF 1:1 Redundancy Switch MN/CRS180.IOM
Cables and Connections Revision 11
5–33
5.5 Cabling to the CDM-710G
1) For information on configuring the CRS-180 70/140 MHz 1:1 Redundancy Switch
with the CDM-710G High-Speed Satellite Modems for 1:1 operation, see:
• Chapter 4. MODEM
AND SWITCH CONFIGURATION
• CDM-710G High-Speed Satellite Modem Installation and Operation Manual
(CEFD P/N MN-CDM710G)
2) For information on the cables and cable assemblies specified in this section, see:
• Appendix A. CABLE DRAWINGS
5.5.1 CRS-180CDM-710G Control and IF Interface Connections Using
Cabling Kit KT/12554
Figure 5-29 shows the CRS-180-to-CDM-710G control and IF interface connections. The Comtech
EF Data KT/12554 CRS-180 70/140 MHz IF 1:1 Redundancy Kit provides all control and IF
connection components.
Figure 5-29 NOTES:
1) Use of the XF/BNC-MF-50-75 transformers (Item 2) is required on the ‘J7 | Rx’
and ‘J8 | Tx connectors, located on the antenna side of the switch, when you
supply a 75Ω Rx/Tx connection.
2) Use of the XF/BNC-MF-50-75 transformers (Item 2) on the Rx A and Rx B ports,
located on the modem side of the switch, is dependent on the CDM-710G’s
factory configuration for 50Ω or 75Ω Rx operability. If the modems in use are
configured as 50Ω Rx units, the transformers will not be used on the Rx side
and the 50Ω cable (Item 4) will be used in place of the 75Ω cable (Item 3).
3) To provide User access to modem “Fault Summary Relay,” Control ‘Y’ Cable
CA/WR13011-4, sold separately, is available for use in place of the
CA/WR12135-1 cable.
4) Control Cable CA/WR12135-1 will mute the Offline Modem’s Tx IF. If this is not
desired, then an alternate cable, Control Cable CA-0000187, sold separately, is
available for use in place of the CA/WR12135-1 cable.
5) You must order terrestrial data interface components/kits separately. See Sect.
5.5.2 for CDM-710G terrestrial data interface configuration and connection
examples and details.