FAX Functions

This section contains specifications for the features and performance of Hayes facsimile modems based on Class 1 and Class 2 interface commands and responses. New commands, S-registers, and result codes for FAX are included.

Hayes modems may include Group 3 FAX capability. Control of FAX modems is by means of the DTE to DCE interface specifications for modems, known as Class 1 and Class 2.0 [1,2]. Class 1 provides a set of primitive commands and result codes [1]. The DTE must provide T.30 session management and T.4 image handling. Class 2.0 places more of the burden on the modem, using a set of AT commands and responses to instruct the modem to manage the communication session and transport image data.

Note: See References.

This Section describes how the functions work; not which functions are included in particular products. Click on one of the following topics for more information:

Philosophy (FAX)

Modem FAX Modes

DTE Interface Leads (FAX)

General FAX Operation

FAX Class 1

FAX Class 2

EOL Detection

Data Commands and Registers (FAX)

Special Call Set-up Conditions

FAX References

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