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Online! The Book by Wendy Taylor, Chris Pirillo, John C. Dvorak

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Cable, DSL, and ISP Modems

The cable modem is a device that hooks a PC to a digital cable line. It is really an adapter because the digital data rate of your computer is not compatible with the cable system's digital system. A cable modem does not actually do any modulation or demodulation. It changes a digital signal from one format to another. A cable modem attaches through a standard Ethernet card in the computer. The cable modem attaches to the round coaxial cable (one that you typically attach to your television set). The cable modem will change the digital signal to a digital signal that the cable company's hardware can manipulate. At the cable company there will be other hardware to further refine and change the signal to interface with ...

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