But how do faxes talk to each other? Before sending a document, the two faxes in different locations have a quick conversation, called a handshake, to confirm there's really a fax machine on the other end, explained Abe Lopes, owner of Ace Copy Inc., an office equipment repair shop based in Newark, New Jersey. "That's why you hear the little ‘deh-leh-lehhh' sound, the little dial tones," he told Live Science. … [Read more...] about How do fax machines work?
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