|2.||(Computers) organized so that data may be transmitted in two opposite directions over the same channel; - of communications channels, such as data transfer lines between computers.|
|v. t.||1.||(Teleg.) To arrange, as a telegraph line, so that two messages may be transmitted simultaneously; to equip with a duplex telegraphic outfit.|
|n.||1.||something which is duplex; - used mostly in reference to a living unit, such as an apartment, in a building having two similar living units.|
|2.||(Biology, Genetics) a double-stranded region in a nucleic acid molecule. See deoxyribonucleic acid.|
|Noun||1.||duplex - a house with two units sharing a common wall|
|2.||duplex - an apartment having rooms on two floors that are connected by a staircase|
Synonyms: duplex apartment
|Adj.||1.||duplex - (used technically of a device or process) having two parts; "a duplex transaction"|
|2.||duplex - allowing communication in opposite directions simultaneously; "duplex system"; "duplex telephony"|
|(communications)||duplex - Used to describe a communications channel
that can carry signals in both directions, in contrast to a
simplex channel which only ever carries a signal in one
If signals can only flow in one direction at a time the communications is "half-duplex", like a single-lane road with traffic lights at each end. Walkie-talkies with a "press-to-talk" button provide half-duplex communications.
If signals can flow in both directions simultaneously the communications is "full-duplex", like a normal two-lane road. Telephones provide full-duplex communications.
The term "duplex" was first used in wireless, telegraph, and telephone communications. Nearly all communications circuits used by computers are two-way, so the term is seldom used.