Multiplexing
Multiplexing is a technique that enables a number of communications channels to be combined
into a single broadband signal and transmitted over a single circuit. At the receiving terminal,
demultiplexing of the broadband signal separates and recovers the original channels. Multiplexing
makes more efficient use of transmission capacity to achieve a low per channel cost. Two basic
multiplexing methods used in telecommunications systems, are frequency division multiplexing
(FDM) and time division multiplexing (TDM).