From Longman Dictionary of Contemporary Englishmultiplexermul‧ti‧plex‧er /ˈmʌltəpleksə $ -ər/ noun [countable] technical a piece of computer equipment that is used to send several electrical signals using only one connection, especially with a modem —multiplexing noun [uncountable]
Examples from the Corpus
multiplexer• Where more than one channel is provided for, the device is question will incorporate some form of analogue multiplexer.From Longman Business Dictionarymultiplexermul‧ti‧plex‧er /ˈmʌltɪˌpleksə-ər/ noun [countable]COMPUTING a piece of equipment used to send several electrical signals using only one connection, used especially with MODEMs 