What is Multiplexer?
[[Image:Multiplexer2.png|thumb|300px|right|[[Schematic]] symbol of a 2-to-1 Multiplexer. It can be equated to a controlled switch.]] [[Image:Demultiplexer.png|thumb|300px|right|[[Schematic]] symbol of a 1-to-2 Demultiplexer. Like a multiplexer, it can be equated to a controlled switch.]] In [[electronics]], a '''multiplexer''' or '''mux''' (''occasionally the term '''mul-dex''' is also found, for a combination multiplexer-demultiplexer'') is a device that selects one of many [[Analog signal|analog]] or [[Digital signal|digital]] input signals and outputs it into a single output line. This process is [[Technical terminology|termed:]] '''multiplexing'''. An electronic multiplexer makes it possible for several signals to share one expensive device or other resource, for example one A/D converter or one communication line, instead of having one device per input signal. An '''analog multiplexer''' is a special type of analog switch that connects one signal selected from several inputs to a single output. A '''digital multiplexer''' is a set of parallel switches, with selector that selects one of the input digital channels to outputs into the single digital output channel. The selector selects one of the input channels according to the digital command (number) it receives. In [[electronics]], a '''demultiplexer''' (or '''demux''') is a device taking a single input signal and selecting one of many data-output-lines, which is connected to the single input. A multiplexer is often used with a complementary demultiplexer on the receiving end. An electronic multiplexer can be considered as a multiple-input, single-output switch, and a demultiplexer as a single-input, multiple-output switch. In [[telecommunications]] and [[signal processing]], a multiplexer is a device that combines several input information signals into one output signal, which carries several [[communication channel]]s, by means of some [[multiplexing|multiplex technique]]. A '''demultiplexer''' is in this context a device that takes a single inpu