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group 4

group 4 in Technology

protocol, compression
(G4) The CCITT fax protocol which uses data compression and allows a variety of file types (e-mail, pictures, PostScript, etc.) to be transmitted over digital (ISDN) telephone lines.
The Group 4 protocol was published by CCITT in 1993. Full details of the protocol are available from ITU-T.
See also Group 3.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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