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Modems grew up of the need to connect teletype machines over ordinary phones lines instead of more expensive leased lines which had previously been used for current loop-based teleprinters and automated telegraphs. IBM adapted this technology to their unit record.
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The United States miitary expressed a need to transmit hundreds of radar images centres during the Cold War, the thumed to the telephone as a solution, using early type modems to transmit images across the country. This would eventually lead to the AT&T Digital Subset in the late 1950's
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The first commercial, mass produced computer modems, called a Digital Subset, was develop; to link SAGE computers across the United States and Canada. It could communicate at 110bits per second.
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AT&T introduce the bell 103 data phone, which set the standard for 300 bit per second full duplex modem.
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Dale Heatherington and Denis Hayes created the world's first personal computer modem, the Hayes 80-103A.
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In 1981 the Hayes Smartmodem was introduce, delivering the first 300bps modem to integrate its own command set. it lso delivered a 1200bps version, representing a big step forward in internet speed.
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During this period internal Pc modem became such a commodity that prices plunged and vendors began to ship modems as standard components of desktop Pc's and laptops. This era saw the introduction of Winmodem.
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In 1996, Brend Townsend came up with the technology for the 56K Modem. Two years later, in 1998, the first widely available 56K Modem was introduce into the market.
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Having reached the limits of analogue technology, companies tried various new approaches to gain fater modem speed. The first alternative was all-digital phone lines(ISDN), though the cost limited their popularity. Modems that work over cable TV won a following.
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Offered aplication services including wide-areas wireless voice telephone, mobile internet access, video calls and TV, all in a mobile enviorement.
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It represented the fourth generation of celular wireless standards. It service was at 100Mbit per second for high mobility communications and 1Gbit per second for low mobility communications.