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| Fax Machines Introduction
A fax machine scans each outgoing page and converts the images into a series of light and dark dots. This pattern is then translated into audio tones and sent over regular phone lines. The receiving fax machine "hears" the tones, pieces the grid together, and prints the total compilation of dots. The result is black and white copies of the original pages. Sending speeds
Transmission standards The majority of fax machines transmit at speeds of 9,600 bits per second (bps) or 14,400 bps. Faxing at 9,600 bps takes 15 to 60 seconds per page. A transmission standard called V.17 sends faxes at 14,400 bps, reducing the sending time for a single page to six to 10 seconds. The newest transmission standard, V.34, lets you send faxes at 33,600 bps - about three seconds per page. Although both V.17 and V.34 tend to add a few hundred dollars to a machine's cost, the cost-benefit is worthwhile if your company faxes more than 30 pages a day. You can only use the high speeds through V.17 and V.34 when transmitting to other fax machines that have the same protocols. But V.17 and V.34 machines are equipped with a fallback mechanism that lets them send and receive at 9,600 bps to ensure that they stay compatible with older machines. Data compression protocols Simply put, data compression protocols reduce the time it takes to send a page by describing it with a minimum amount of data. You can reduce transmission costs by buying a machine with advanced data compression protocols. Virtually all fax machines are equipped with a basic compression protocol called Modified Huffman (MH). Machines equipped with the more advanced Modified Read (MR) or Modified Modified Read (MMR) protocols can send documents as much as 25 percent faster. Some machines
use their own sending or compression protocols to increase the speed
of transmission. You should know, however, that these protocols
only work when sending to or from same-brand models. Unless you
frequently fax between two offices with the same type of machine,
you won't noticeably reduce your overall sending costs with such
brand-specific compression systems.
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