Interpreting the Group 3 FAX Set-up Protocol

This tutorial describes the protocol used to set up voice-channel dial-up facsimile machines which operate in accordance with CCITT Group 3 specifications. This includes both the so-called "standard" protocols where only CCITT-acknowledged capabilities are evoked and the "nonstandard" configuration commands used to evoke proprietary capabilities in the machines built by certain manufacturers. As background, Section 2 describes the transactions conducted between two FAX machines to set up and confirm the transmission of an image. Section 3 then describes the signaling protocol specified by CCITT's recommendation T.30. Section 4 outlines a program written at Applied Signal Technology for demodulating the protocol's data sequence and interpreting the information contained within.

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