Canon fax basic 2000 Manuale Di Servizio

GENERAL DESCRIPTION OF A FACSIMILE

2–2

1. WHAT IS A “FACSIMILE?”

A facsimile is a machine that is connected to the telephone line instead of

the telephone, and transmits and receives documents instead of holding

conversations.

In this section, let’s start with a description of the rules governing facsimi-

les.

1.1

Established Rules of Communication

The communications equipment used for communications via public tele-

graph and telephone facilities must be designed to conform to the recom-

mendations specified by the 

ITU-T recommendations.

Facsimiles are designed to conform to these recommendations as they use

telephone lines to perform communications.

At this point, let’s consider why established rules of communication (ITU-

T recommendations) are necessary. Communications must be possible

between facsimiles made by different manufacturers. If facsimiles were

designed to conform to individual manufacturers’ standards, we would not

be able to transmit or receive documents between facsimiles made by dif-

ferent manufacturers. It is, naturally, very advantageous for today’s mod-

ern information society that facsimile communications be possible via

telephone lines anywhere there is a telephone using any type of facsimile.

This is why established rules of communication (ITU-T recommendations)

are required for facsimile communications.

1.2

Control Procedure

The purpose of a facsimile is to transmit a image of a document to another

facsimile. Actually, the two facsimiles transmit and receive control proce-

dure signals before and after image signals are transmitted, to notify each

other of the communication. Here, let’s bring to mind an instance of some-

one making a telephone call. Before you state your business, you say

“Hello?” or tell other person your name. Facsimiles also perform this same

type of transaction using fixed control procedures.

All of these control procedures are specified according to ITU-T recom-

mendations.