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to 3,429, to create 14.4, 28.8, and modems. This rate is near the theoretical Shannon limit of a phone line.

technologies

While speeds had been available for leased-line modems for some time, they did not become available for dial up modems until the late 1990s.In the late 1990s, technologies to achieve speeds above began to be introduced. Several approaches were used, but all of them began as solutions to a single fundamental problem with phone lines.

By the time technology

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