[haf-doo-pleks, -dyoo-, hahf-] /ˈhæfˈdu plɛks, -ˈdyu-, ˈhɑf-/

of or relating to the transmission of information in opposite directions but not simultaneously.

(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.


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