The Model 465 has the 1.6/5.6 coax connectors used extensively in telephone exchange sites. The balun has two interfaces, so both the TX and RX coax signals can be carried over a single length of twisted-pair cabling (which is much less costly than any kind of coaxial cable) (see diagrams below).
Operating in compliance with the CCITT G.703 specification, the Model 465RC occupies only 2U (3.5 in./8.9 cm) of vertical rack space in a 19-in. (48.3-cm) rack—allowing for efficient multiport matching. What's more, the Model 465RC is modular, meaning that each balun can be added separately. Purchase an entire panel fully populated with 16 balun modules (Model 465RC/16/F). Or purchase the chassis separately (Model 465R/16) and add balun modules (Model 465RC/F) as you need them!
On individual twisted pair ports, shield-to-pin and shield-to-ground connections are strap selectable. So you are not locked into the same configuration for every balun in the panel. If you need to do multiple 75-ohm to 120-ohm conversions, the Model 465RC is definitely the way to go!