Group 4


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Group 4

(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.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
References in periodicals archive ?
Group 4: How to Find Articles from Scholarly Journals.
Combination of these two partial evaluations yields a preliminary default evaluation that the agent is one of the following: group 1, carcinogenic to humans; group 2A, probably carcinogenic to humans; group 2B, possibly carcinogenic to humans; group 3, not classifiable as to its carcinogenicity to humans; or group 4, probably not carcinogenic to humans.
Group 4 received the old except-for qualification (due to the principle change); group 5 received the new standard unqualified report with no reference to the inconsistency.
On the other hand, so few patients fit into severity group 4 that it may be a useless group.