multiplexing

                        Multiplexing is the process where multiple channels are combined for transmission over a common transmission path.

                  Different types of multiplexing

                                    There are two types of multiplexing. 

                        (1)       Frequency division multiplexing. 

                        (2)       Time division multiplexing. 

                  (1) Frequency division multiplexing (FDM):         

                                   

                                    Frequency division multiplexing (FDM) is a scheme in which numerous signals are combined for transmission in a single communications line or channel. Each signal is assigned a different frequency within the main channel.

(2)             Time division multiplexing (TDM):

                                   

                                    Time division multiplexing (TDM) is a method of putting multiple data streams in a single signal by separating the signal into main segments, each having a very short duration. Each individual data stream is reassembled at the receiving end based on the timing.