1) In communication transmission systems, mux (pronounce muks, sometimes spelled "MUX") is an abbreviation for multiplexing,a device that sends multiple signals on a carrier channel at the same
time in the form of a single, complex signal to another device that
recovers the separate signals at the receiving end. The receiver is
sometimes called a demux (or "DEMUX").
2) On the Internet, a MUX is a multi-user text game played over the
Internet, using the TinyMUX server. This kind of game started with the MUD (multi-user dungeon) movement.
简单的说：就是“多通道多路复用器”