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Note: This section is out of date and no longer maintained.
It is retained for the value of any residual information contained in it.

DSL - Section 3

More detail.. DSL[2] (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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high speed

High speed in terms of internet connectivity over long distances could be considered as anything better than ISDN. Speed is measured by bits per second, and when the numbers get big, using K or M to bring them down to size. Common speed inter-company data pipelines are T1, or T3 or faster, and these labels are also used as speed measures. A good 56k modem on a clean line will manage at most 48k bits per second. This is roughly 1/30th the speed of a T1. A smallish ISP may share a T1 amongst hundreds of simultaneous dialup sessions. An large office may share a T1 for internet and email traffic amongst 500 employees or more. On the other hand, DSL speeds are commercially available that range from 1/12th of a T1 to 5x a T1. This is truly high speed. Related topics to consider along with pure theoretical speed are also ping time/latency of the connection, sustainable transfer rates versus burst rates, as well as monthly traffic limits, and packet drops. In addition, for windows machines, registry settings can have a big effect on throughput.
Comparing DSL to 56k modems, it is obvious the jump in performance is huge.



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