Fax Operation; Modem As Fax Machine - ZyXEL Communications U-336R/RE User Manual

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Fax Operation

In the sections below, we will describe how the U336R/RE works
as a fax machine, the ITU-T T.30 fax protocol, the Class 1, 2, and
2.0 fax commands and ZyXEL extended fax AT commands. Also
covered are the status report result codes, the flow control protocol
associated with ZyXEL fax AT commands, and some specific fax
applications. The instructions for using the included
modem/fax/voice utility program are included on the software disk.
Some distributors and dealers may have included other software
with your modem. For help with such software, refer to the
software instructions.

Modem as Fax Machine

Modems can also be designed to include a fax transmitting and
receiving function similar to a fax card. Since the modem's interface
with the computer is the standard serial RS-232 interface, this
interface is used for both modem and fax operations. Fax image
coding and decoding must be done in the computer.
Your modem supports Group 3 send and receive facsimile
functions. For normal fax operation, you must connect the modem
to a computer, usually a PC. The computer serves as the
input/output device for the fax function. The RS-232 serial
connection or the ZyXEL serial port interface connects you modem
to the computer. Your modem uses the same interface for both data
and fax applications. In fax operations, the modem performs
protocol handshaking and image data transfer. The computer
handles image data creation, capturing, conversion, compression,
decompression, retrieval, and storage.
Fax Operation 53