Comtech EF Data CRS-180 - Manual (Page 87)

CRS-180 70/140 MHz IF 1:1 Redundancy Switch MN/CRS180.IOM
Cables and Connections Revision 11
5–27
5.4.1.2 Switch-to-Modem IF Interface Connection
EXAMPLE: The Tx IF from ‘MODEM A’ connects to the Tx IF port ‘J5 | Tx A’ on the
CRS-180; similarly, the Tx IF from ‘MODEM B’ connects to the Tx IF port ‘J6 | Tx B’
on the CRS-180.
The same logic applies for the Rx IF connections. It is important to note that failure
to observe this requirement will result in system malfunction.
Figure 5-23 NOTES:
1) Excluding the modems, the KT/11599 1:1 Redundancy Control/IF Interface
Cabling Kit (see Sect.5.4.1) provides all components shown in Figure 5-23.
2) 50-75Ω transformers (Item 2) are 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.
Item CEFD P/N Qty Description
1 PL/0946-1 4 IF Coax Cable, 50Ω
2 XF/BNC-MF-50-75 2 Transformer, 50-75Ω, 2-200 MHz, BNC, M/F
Figure 5-23. CDM-570/A Switch-to-Modem 70/140 MHz IF Connections (CEFD Kit
KT/11599)