(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.
- Group agglutination
group agglutination n. The clumping of antibodies specific for a group of antigens common to several bacteria, each of which possesses its own specific antigen.
- Group agglutinin
group agglutinin n. An agglutinin specific for a group antigen. Also called cross-reacting agglutinin, minor agglutinin, partial agglutinin.
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.