Fax Operation; Fax Basics - ZyXEL Communications U-336E User Manual

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Fax Operation

The U-336E can be used as a fax machine. In the sections below,
we will describe how the modem 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.

Fax Basics

Fax is the abbreviation for facsimile. There are four major parts in a
fax machine: the scanner, encoding and decoding device, modem,
and printer. Before a page can be sent, it is first scanned. The bit-
mapped data is encoded with data compression and is then
transmitted across the phone line by an internal modem module.
The remote facsimile receives the data with its internal modem,
decodes it back to bit-mapped image data, and prints it on paper.
Fax Branding: The Telephone Consumer Protection Act of 1991
makes it unlawful for any person to use a computer or other
electronic device to send any message via a telephone or fax
machine unless such message clearly contains in a margin at the top
or bottom of each transmitted page or on the first page of the
transmission, the date and time it is sent and an identification of the
business or other entity, or individual sending the message and the
telephone number of the sending machine or such business, or
Fax Operation 45