transmission and reception between communicating stations occur in separate portions of the frequency spectrum of the transmission medium.
(1) Note. Classification here requires more than merely two stations in communication on different frequencies. Full duplex operation (i.e., simultaneous transmission and reception by each station) is required.
SEE OR SEARCH THIS CLASS, SUBCLASS:
343+, for wireless multiplex communications via frequency channels not limited to a duplex system.
SEE OR SEARCH CLASS
455, Telecommunications,
23, for a nonmultiplex frequency carrier wave repeater system.
