A Multiplexer (commonly called Mux) is a device that can select one of several input signals and then forward it to a single output line. It is generally implemented using a combinatorial circuit which prior information on the number of inputs. Mux are generally used to increase the amount of data that can be sent over a network within the constraints of time and bandwidth. The single output is then put back on the correct output line at the receiver using a demultiplexer (demux).
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