full-duplex

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.

2. An obsolete term for remote echo.

Compare simplex, half-duplex, double-duplex.

(2001-07-21)