Modem-To-Switch 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
4.4.3

Modem-to-Switch 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.
Item CEFD Part No.
1 PL/0946-1
2 XF/BNC-MF-50-75
Figure 4-21. CDM-570 Modem-to-Switch 70/140 MHz IF Connections
Modem‐to‐Switch IF Connection Notes:
1. Excluding modems, all components depicted in Figure 4‐21 are provided in the KT/11559
CDM‐570 70/140 MHz IF 1:1 Redundancy Kit (see Sect. 4.4.1).
2. 50‐75Ω transformers (Item 2) are required on the Rx (J7) and Tx (J8) connectors, located on
the antenna side of the switch, when the user supplies a 75Ω Rx/Tx connection.
Qty Description
4 IF Coax Cable, 50Ω
2
Transformer, 50-75Ω, 2-200 MHz, BNC, M/F
4–23
Revision 8
MN/CRS180.IOM