Public Switched Telephone Network was originally designed for voice communications only. To reduce the bandwidth required for a voice call, engineers limited the frequencies from 0 to 4000Hz allowing more simultaneous calls (The range of the normal human voice is 300 to 3500Hz.) Unfortunately, this bandwidth range has a detrimental effect on data communications. Multiple PPP Also known as "shotgun". This means you connect two modems, to two phone lines, and Madera dialup , Madera, CA dialup MaderaMadera , dialup California, Madera dialup
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