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Maintenance and Troubleshooting continued
How a Fax Works
About Facsimile Compatibility
Facsimile is a system of sending printed
or other graphic information from one
location to another by producing a copy
or “facsimile” of that information at the
remote location. A fax unit transmits audio
tones over the same telephone lines you
use for person-to-person conversation.
The facsimile process involves three basic
steps :
The CCITT (Consultative Committee for
International Telephone and Telegraph),
which sets worldwide standards for data
communication, classifies
facsimile
devices into three groups. The grouping
is based on how a fax unit sends
information, in what form, and at which
speed.
1. Reading and converting the document
into electronic signals (audio tones).
2. Sending, or transmitting, the signals
through a telephone system to another
fax unit.
3. Converting the received signals into a
“facsimile” of
the
transmitted
document.
To simplify, you can think of fax units as
being grouped by speed: Group 1
includes 6-minute units, Group 2 includes
3-minute units, and Group 3 includes
sub-minute units. These speeds refer to
the amount of time it takes a fax unit to
send or receive a standard business letter
over the telephone lines.
Your FX505 is compatible with CClTT G3
mode units.
This is a simplified explanation of the
actual facsimile process. Although all fax
units operate by this same basic process,
specific operating procedures differ from
unit to unit.