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quadruplex

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quad⋅ru⋅plex

[kwod-roo-pleks, kwo-droo-pleks]
–adjective
1. fourfold; quadruple.
2. noting or pertaining to a system of telegraphy by which four messages may be transmitted simultaneously over one wire or communications channel.

Origin:
1870–75; < L; see quadru-, -plex
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Computing Dictionary

quadruplex communications
A kind of telegraphy system developed by Thomas A. Edison in the 1870s combining diplex and duplex communications to support simultaneous transmission of two messages in each direction.
(2000-04-02)

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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