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In electronics, a multiplexer or mux is a device that selects one of several analog or digital input signals and forwards the selected input into a single line.[1] A multiplexer of 2n inputs has n select lines, which are used to select which input line to send to the output.[2] Multiplexers are mainly used to increase the amount of data that can be sent over the network within a certain amount of time and bandwidth.(带宽) In [Digital Logic], a "Multiplexer" converts multiple input to a single output. An electronic multiplexer makes it possible for several signals to share one device or resource, for example oneA/D converter or one communication line, instead of having one device per input signal. In telecommunications, a multiplexer is a device that combines several input information signals into one output signal, which carries several communication channels, by means of some multiplex technique. A demultiplexer is in this context a device taking a single input signal that carries many channels and separates those over multiple output signals. 复用器是将来自若干单独分信道的独立信号复合起来，在一公共信道的同一方向上进行传输的设备， 是一种综合系统。通常包含一定数目的数据输入，n个地址输入（以二进制形式选择一种数据输入）。复用器有一个单独的输出，与选择的数据输入值相同。复用技术可能遵循以下原则之一，如：TDM、FDM、CDM 或 WDM。复用技术也应用于软件操作上，如：同时将多线程信息流传送到设备或程序中。 参考：Wikipedia:Multiplexer 互动百科：复用器
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