The Free On-line Dictionary of Computing (30 December 2018):

transceiver

    Transmitter-receiver, any device that performs
   both functions.

   For example, on an Ethernet network, a transceiver is the
   hardware that connects a host interface (e.g. an Ethernet
   controller) to a local area network.  Ethernet transceivers
   contain electronics that apply signals to the cable and sense
   other host's signals and collisions.  See also CSMA/CD.

   (2008-08-04)