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ADSL and DSL Technologies [Secure eReader]
eBook by Walter Goralski

eBook Category: Technology/Science/Education
eBook Description: Discover how to unclog the Internet bottleneck and move data across the public switched telephone network faster than ever before! What loads Web pages up to 50 times faster and cheaper the ISDN (Integrated Services Digital Network) channels, the fastest data transmission technology currently available to home users? ADSL (Asymmetric Digital Subscriber Line) technology. It's here today, and it uses the existing copper lines that already connect 600 million subscribers to the PSTN. Recently released standards promise to spur rapid growth in the development of a new high-speed ADSL-based applications--vastly faster Internet access and new broadband services like entertainment video telecommuting, video conferencing, enhanced telephone, and more. Now telecommunication engineers, vendors, and business managers in the cable and telephone industries can quickly get a handle on ADSL technology--without having to wade through ADSL guideBook sorts it all out and translates it into terms that everyone involved with this new technology (carrier personnel, educators, consultants, and consumers) can understand.

eBook Publisher: McGraw-Hill Companies, Published: 2001
Fictionwise Release Date: April 2002


I wrote this book to do my part to promote change in the public telephone network. Although it usually comes with a price tag, change is good, and all networks must change if they are to grow and prosper. Networks that do not change will wither and struggle. It does not matter whether the network involved is the telephone network. All networks must evolve as the needs of the users change, as the technology on which the network is based changes, and as the entire economic, social, and political backdrop against which the network exists slowly transforms itself.

Consider the highway network of roads in the United States. From humble beginnings as simple "post roads" for mail delivery and stage coaches, the network adapted itself to automobiles by adding pavement and traffic signals. The system was transformed again when post-World War II prosperity encouraged automobile use for a wide variety of reasons, from commuting to the recreational Sunday drive in the country. The Interstate Highway System with limited access and guard rails better reflected this new environment.

It is not for nothing that telephone network terminology closely mirrors road system talk. Both systems have access links and bypasses. Both have tolls and interchanges. And more to the point, both have traffic and congestion. The talk about an Information Superhighway started out in discussions about an "interstate highway system for data." As will be shown, both telephone networks and highway networks share much more than terminology.

This book emphasizes one of the ways that may be used to transform the voice network in the United States (and for that matter, around the world) into a network better suited for the "automobiles" of the 1990s. If telephones are the voice network's stage coaches, then modern personal computers attached to the Internet are its luxury cars. This being the case, perhaps local access lines using Asymmetric Digital Subscriber Line (ADSL) technology are better suited for users than the "plain old telephone service" (POTS) access lines of the last 100 years or more.

Although many technologies can play a role in modernizing the voice network, ADSL is singled out in this text because ADSL has an edge over many others in terms of standardization, vendor activity, economics, and customer interest. The question is whether ADSL can maintain this edge. Other technologies will be mentioned in this regard, but ADSL is investigated in full. Whatever the outcome over the next 5 or 10 years, it certainly will be an interesting ride.

Copyright © 1998 by The McGraw-Hill companies, Inc.

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