[W/K] :: full-duplex

  full-duplex
       
           (fdx, from telegraphy) 1. A type of
          duplex communications channel which carries data in both
          directions at once.
       
          On purely digital connections, full-duplex communication
          requires two pairs of wires.  On analog networks or in
          digital networks using carriers, it is achieved by dividing
          the bandwidth of the line into two frequencies, one for
          sending, and the other for receiving.
       
          2. An obsolete term for remote echo.
       
          Compare simplex, half-duplex, double-duplex.
       
          (2001-07-21)