Modem As Fax Machine; Itu-T T.30 Fax Protocol - ZyXEL Communications U-336S User Manual

machine or such business, or entity, or individual. In order to program
this information into the fax function of your modem, please refer to the
documentation of the fax software you will be using.

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. Modem/Fax, also called
fax/modem, can be either an external stand-alone unit or a plug-in card.
External stand-alone units can be connected to any computer with a
standard RS-232 serial port.
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.

ITU-T T.30 Fax Protocol

The ITU-T T.30 fax protocol is known as the G3 fax handshake signals
and procedures. The modem takes full control of this protocol -
initiating and terminating fax calls, managing the communication session,
and transporting the image data. Therefore, the modem relieves the
computer fax software of the T.30 protocol handling.
Fax Operation 65