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A fax device scans a page to be transmitted, inspecting tiny areas, and converts each point to a value representing how light or dark that point is. That value is converted to a sound where the frequency and/or volume of the sound corresponds to the darkness level of that spot on the page. The sounds all go through the phone line where another fax modem or a fax machine receives the sounds and converts it back to a number and then back to a spot on a page being printed.

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