When multiple phone calls are carried in the same frequency band at the same time. In wireless, major multiplexing methods include TDMA and CDMA. (Cingular)
In telecommunications, multiplexing (also MUXing) is the combination of two or more higher level channels into a single lower level channel such that a reverse process, known as inverse multiplexing, demultiplexing, or demuxing, can extract the original channels. The individual channels are identifiable by a predetermined coding scheme. (Wikipedia)
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