RF Multiplexers use bi-directional bandpass filters to combine RF signals for transmission through a single coaxial cable or to split a combined signal into separate signals for transmission through independent coax cables. Types of multiplexing include diplexing, duplexing. triplexing, quadplexing and quintplexing. Multiplexors are differentiated by their frequency bands, low band attenuation, high band attenuation, return loss and mounting type.