[haf-doo-pleks, -dyoo-, hahf-] 
| of or pertaining to the transmission of information in opposite directions but not simultaneously. |
half-duplex communications
(hdx, from telegraphy) 1. A type of communication channel using a single circuit which can carry data in either direction but not both directions at once.
Compare: simplex, full-duplex.
2. An obsolete term for local echo.
(2001-07-21)
plɛks