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.


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  • Group agglutinin

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  • Group-annuity

    noun, Insurance. 1. a plan in which the members of a group, usually employees of the same company, receive annuities upon retirement.

  • Group antigen

    group antigen n. Any of several antigens that are shared by related genera of microorganisms.

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