Frequency Division Multiplexing

Frequency  division  multiplexing (FDM) is an analogy technique that can be applied when the bandwidth of a link is greater than the combined bandwidths  of the single  to be transmitted. In FDM the bandwidth is devised into a  number of frequency slots each of  which  can accommodate the single  of an individual connection. The  multiplexer assigns  a frequency slot to each connection and  uses modulation the place the single of the  carries all the  connections. The  combined  signal  is transmitted and the de multiplexer recovers the single corresponding to each  connection. Reducing the  number of wires that need  to be handled  reduces the overall  cost of the system.