翻訳と辞書
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・ duck typing
・ duel
・ duff's device
・ dumb terminal
・ dumbed down
・ dump
・ dumpster diving
・ dungeon
・ dup killer
・ dup loop
duplex
・ duplex high speed data
・ durra
・ dusty deck
・ dv cartridge
・ dvd
・ dvd-r
・ dvd-ram
・ dvd-rom
・ dvi


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duplex : FOLDOC
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)}.
(2001-07-21)



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