communications (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.
(2001-07-21)