![]() ![]() Typically, fiber can handle a greater bandwith than copper, but good quality can be achieved with copper, too. 200 bps, it depends on the installation of the last mile and in your house (and your provider's willingness to use it in the best way). Digital subscriber lines (DSL) take advantage of the fact that many phone lines, when not being filtered, can take more than the mediocre audio bandwith of telephones. Old systems had filters and the wires were often not capable of much more than the filter-defined bandwith. ) and systems with optical fibers are even better.Ī telephone connection has an audio bandwith limited to a few kHz. ), twisted pair wires increase the bandwith and are more immune to external noise with an increasing "CAT number" (6 being better than 5e, being better than 5. Of the wiring systems in question, a simple two-wire phone line will have the lowest bandwith and the worst noise properties (crosstalk and interference from neighboring lines. The best data rate can be achieved with a low-noise installation of a channel that offers a high bandwith. $$C = B \cdot log_(1 S/N)\$, and the bit rate includes redundancy (error checksums and the like). There's one beautiful, simple equation that has it all, called the Shannon–Hartley theorem:
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