September 2001
Intermediate to advanced
272 pages
7h 27m
English
book
Design and Implementation of DSL-Based Access Solutions
by Sanjeev CCIE #4006 Mervana, Chris CCIE #5235 Le
Content preview from Design and Implementation of DSL-Based Access Solutions
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ADSL Comes of Age
Asymmetric digital subscriber line (ADSL) is a technology invented by BellCore in the mid-1980s as a method to offer video and voice over the same copper loop. The intent was to offer VoD to their customers when they wanted it. When the technology fizzled out because VoD failed to take off and typical deployment of ADSL was too slow to run any real-time video over it; however, the technology seems to have been forgotten for almost a decade.
ADSL had a renewed interest from phone companies again after their voice network became overloaded with data. ADSL was being looked at again, but this time the main application that was driving it was data—not video like it was originally designed for. In the early 1990s, phone companies ...
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