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Fax is the transmission of photographs, drawings, maps, and written or printed words by electric signals. Light waves reflected from an image are converted into electric signals, transmitted by wire or radio to a distant receiver, and reconstituted on paper or film into a copy of the original. In other words you can say Fax technology used to transfer copies of documents, especially using affordable devices operating over the telephone network. The words telecopy and telefax are also used as synonyms.

It is faster than regular mail and more affordable than overnight delivery. While email has begun to supplant the fax in many businesses, fax machines are still indispensable for immediately sharing contracts, proofs, and other written documents.

Fax machine prices vary quite a bit. At the low end, you can find thermal transfer or inkjet fax machines for around $100. However, these are home-office machines, not built for the daily stress many businesses put on their fax machines. If your business depends on the fax for important documents, you should spend the extra money to get a true business-grade fax machines.

Although fax machines of some sort or another have existed since the mid-late 19th century , modern fax technology became feasible only in the mid-1970s as the sophistication and cost of the three underlying technologies improved to a reasonable level. Over time, faxing gradually became affordable, and by the mid-1980s, fax machines were very popular around the world.

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. But while the idea of fax machines has existed since the 1800s, fax machines did not become popular until the mid 1980s.

In 1861 the first fax machine, Pantelegraph, was sold by Giovanni Caselli, even before the invention of workable telephones.

The first Color fax machine was built by Dr. La Verne R. Philpott in his home workshop with a drill press, a lathe and a couple of screwdrivers. As a communications device, Color fax opens up a whole new world to the homeowner and businessman alike.

Several different telephone line modulation techniques are used by fax machines. They are negotiated during the fax-modem handshake, and the fax devices will use the highest data rate that both fax devices support, usually a minimum of 14.4 kbit/s for Group 3 fax.

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.

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.

Fax machines are generally turned on 24 hours a day, yet are only actually in use for about an hour, so power management features are important for saving energy and are an easy way to reduce air pollution.

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