COMMS-2000 interface converts a single channel of standard or 2-wire party line intercom to 4-wire audio, while also converting call signals to RS-422 data. The resulting 4-wire audio plus RS-422 data can then be sent to a Clear-Com Matrix port, fiber-optic converter (modem) or connected to another COMMS-2000 over twisted-pair cable such as CAT-5E. When used with a Matrix system, the COMMS-2000 allows a party-line channel to be connected to the frame with up to 5000ft of cable. With its excellent hybrid null and wide-range level controls the unit may also be used as a best-quality stand-alone two-to-four-wire converter.