duplex (redirected from duplexity)

duplex

1. US and Canadian a duplex apartment or house

2. Chemistry a double-stranded region in a nucleic acid molecule

3. Machinery having pairs of components of independent but identical function

4. Electronics permitting the transmission of simultaneous signals in both directions in a radio, telecommunications, or computer channel

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duplex [′dü‚pleks]

(engineering)

Consisting of two parts working together or in a similar fashion.

(graphic arts)

The technique of recording on roll microfilm the front and back image of a document in a single exposure.

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(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 direction. 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. http://cit.ac.nz/smac/dc100www/dc_014.htm.