DSL modems are devices that allow high-speed access to information at a distant server, which may be an Internet server, via the normal telephone network. This may sound all too familiar and similar, to a dial up modem, which too operates via the existing telephone networks. The reader will discover the marked difference in the technology and approach in the two techniques. Digital Subscriber Line (DSL) is a generic name for a family of standards that allow existing twisted pair copper lines (the phone wires) to carry modulated digital content at high speed by expanding the amount of frequency used (which is available but unused by POTS).
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