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" Copiers, Fax Machines, & Office Equipment at the lowest prices! "
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"Copynfax.com is your Copier and Fax Machine Specialty store. We
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| Abbreviation of
facsimile machine, a fax machine is a device that can send or receive pictures and text
over a telephone line. Fax machines work by digitizing an image -- dividing it into a grid
of dots. Each dot is either on or off, depending on whether it is black or white.
Electronically, each dot is represented by a bit that has a value of either 0 (off) or 1
(on). In this way, the fax machine translates a picture into a series of zeros and ones
(called a bit map) that can be transmitted like normal computer data. On the receiving
side, a fax machine reads the incoming data, translates the zeros and ones back into dots,
and reprints the picture. The idea of fax machines has been around since 1842, when
Alexander Bain invented a machine capable of receiving signals from a telegraph wire and
translating them into images on paper. In 1850, a London inventor named F. C. Blakewell
received a patent for a similar machine, which he called a copying telegraph. But while
the idea of fax machines has existed since the 1800s, fax machines did not become popular
until the mid 1980s. The spark igniting the fax revolution was the adoption in 1983 of a
standard protocol for sending faxes at rates of 9,600 bps. The standard was created by the
CCITT standards organization and is known as the Group 3 standard. Now, faxes are
commonplace in offices of all sizes. They provide an inexpensive, fast, and reliable
method for transmitting correspondence, contracts, résumés, handwritten notes, and
illustrations. A fax machine consists of an optical scanner for digitizing images on
paper, a printer for printing incoming fax messages, and a telephone for making the
connection. The optical scanner generally does not offer the same quality of resolution as
stand-alone scanners. Some printers on fax machines are thermal, which means they require
a special kind of paper. All fax machines conform to the CCITT Group 3 protocol. (There is
a new protocol called Group 4, but it requires ISDN lines.) The Group 3 protocol supports
two classes of resolution: 203 by 98 dpi and 203 by 196 dpi. The protocol also specifies a
data-compression technique and a maximum transmission speed of 9,600 bps. Some of the
features that differentiate one fax machine from another include the following: speed: fax
machines transmit data at different rates, from 4,800 bps to 28,800 bps. A 9,600-bps fax
machine typically requires 10 to 20 seconds to transmit one page. printer type: Most fax
machines use a thermal printer that requires special paper that tends to turn yellow or
brown after a period. More expensive fax machines have printers that can print on regular
bond paper. paper size: The thermal paper used in most fax machines comes in two basic
sizes: 8.5-inches wide and 10.1-inches wide. Some machines accept only the narrow-sized
paper. paper cutter: Most fax machines include a paper cutter because the thermal paper
that most fax machines use comes in rolls. The least expensive models and portable faxes,
however, may not include a paper cutter. paper feed : Most fax machines have paper feeds
so that you can send multiple-page documents without manually feeding each page into the
machine. autodialing: fax machines come with a variety of dialing features. Some enable
you to program the fax to send a document at a future time so that you can take advantage
of the lowest telephone rates. As an alternative to stand-alone fax machines, you can also
put together a fax system by purchasing separately a fax modem and an optical scanner. You
may not even need the optical scanner if the documents you want to send are already in
electronic form. |
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