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Chapter 3: Network Link Technologies > THE EVOLUTION OF DSL

THE EVOLUTION OF DSL

IP packet interfaces have been defined for many LAN and WAN network technologies. As soon as a new transport technology reaches the commercial-deployment stage, IP is part of the scheme, if for no other reason than regardless of what is in the middle, TCP/IP in Ethernet frames is at both ends. DSL technologies are a case in point. Originally designed for the “national networks” that would offer everything that the Internet does today, but from the telephone company as part of the Integrated Services Digital Network (ISDN) initiatives of the 1980s, DSL was adapted for “broadband” Internet access when the grand visions of the telephone companies as content providers were reduced to the reality of a restricted role as ISPs and little more. (E....


  

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