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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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DSL:2DSL standards are specifically known as SDSL, ADSL, IDSL and a number of less commonly used standards such as HDSL etc. They all work technically in similar ways. The basic principal is to divide up the frequency spectrum that can be carried reliably on twisted pair into two or three bands. One is for upstream traffic, one for down-stream, and the third for some standards is old style voice. Since telephone quality voice represents a fairly small frequency chunk, carrying that capability along with the data is not difficult.
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