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DSL - Section 3More detail.. DSL (Digital Subscriber Line) is a generic name for a family of standards allowing high speed data transfer over telephone lines (POTS), otherwise known as twisted pair. For carrying IP, DSL competes with cable modems, satellite digital data feeds, wireless digital data, ISDN, 56k modems and more expensive frame-relay lines etc.
Since the twisted pair lines used in the telephone network that are to carry DSL are not shielded from interference, there are limits on the distance DSL signals can travel before degrading the maximum DSL speeds available in all DSL standards.
This distance limitation of DSL is only one of many potential technical hurdles to pass before an installation is complete.
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shieldedAnyone who has heard a car radio give off a loud ticking sound as another car passes by has seen how unshielded equipment or older equipment can both produce or be affected by radio waves. Twisted pair phone system wires are totally open to any interference from the environment they pass over or near.. for example, ceiling lights, thermostats, generators etc can all introduce noise on the line. Even regular household electricity has a 50hz hum that can find its way into the phone system by badly designed equipment or badly placed cables.
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