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.

Last updated: 1998-09-10

Nearby terms:

groupGroup 3Group 4Group Code Recordinggroup identifier

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