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Handbook 165
Glossary
Automatic reduction. Many fax machines will automatically
reduce documents being transmitted to accommodate the
effective printing width of the receiving unit. This allows, for
example, a fax machine with a 10" scanning width to send an
image 10" wide to a unit with an 8.5" print width; the
receiving fax machine will receive a reduced-size printout of
the complete image.
Bits per second. See bps.
Black density. Also called black coverage. The amount of
nonwhite area on a page. For example, most regular office
correspondence has a black density well under 10%, due to
the presence of margins, spaces between words, spaces
between lines and paragraphs and even spaces within letters
(such as e and o). However, drawings and photographs have a
much higher black density, sometimes approaching 100%.
The higher a page’s black density, the more slowly a fax
machine can send it.
This glossary contains terms and words you may encounter
when discussing or reading about fax machines and fax
communications. Please use these definitions for reference
only.
A4, B4, A3. Standard stationery sizes defined by the
International Standards Organization, an agency of the
United Nations. See also Paper sizes.
Auto Dial. Enables user to store preprogrammed telephone
numbers in the unit’s memory. Storage capability varies from
unit to unit.
Automatic fallback. The ability of a fax machine, when
communicating with another fax which is communicating at
a slower rate, to slow down (“fall back”) to the other unit’s
speed.