Cabling With Cdm-570 If; Figure H-3. Cdm-570 And Crs-180 Interconnect - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Appendix H
H.5

Cabling With CDM-570 IF

Figure H-3 shows how to connect a pair of CDM-570 modems together with the CRS-180 70/140
MHz 1:1 Redundancy Switch. The table that is included here lists cable assemblies that may be
supplied with the CRS-180.
Quantity Part #
2 CA/WR9378-4
4 PL/0946-1
It is essential to ensure that the control and IF connections, both Rx and Tx, are made correctly.
For example, the Tx IF from Unit 'A' connects to the Tx IF port 'A' on the CRS-180, and Unit
'B' connects to the Tx IF Port 'B', and the same for the Rx IF connections. Failure to observe this
requirement will result in system malfunction.
When connecting the Control cable between the CRS-180 and the modems,
ensure that screw locks on the 'D' type connectors are securely fastened. This
will prevent the accidental un-mating of the cable, particularly when a standby
unit is being removed or replaced.
Description
Control Cable, Universal, DB9 Male to Male, 4'
IF (Tx/Rx) Coax Cable, 50Ω Type 'BNC', 4'

Figure H-3. CDM-570 and CRS-180 Interconnect

H–7
Revision 12
MN/CDM570L.IOM