mirror of https://github.com/tLDP/LDP
27 lines
893 B
XML
27 lines
893 B
XML
<sect1 id="PSTN">
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<title>PSTN</title>
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<para>
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PSTN (Public Service Telephone Network) is the telephone system that is used
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thoughout the U.S. and many other countries. Although never intended for
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networking, telephone lines can be used for communications for computers.
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</para>
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<para>
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A modem (modulator/demodulator) is used to interface between a computer and
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the telephone system. Modems can convert data into audible tones and back.
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The fastest two-way modems currently available support a speed of 33.6 Kbps
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(kilobits per second).
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</para>
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<para>
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Current modems advertise speeds up to 56 Kbps per second. These modems rely
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on digital equipment being used in the phone company's central office and in
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the facility (such as the Internet Service Provider) you are dialling into.
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The 56 Kbps speed also works in only one direction; the other direction supports
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33.6 Kbps.
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</para>
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</sect1>
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