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CHAPTER
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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For the longest time, access described the manner in which customers reached the network for the transport of voice services. In the last 20 years, however, that definition has changed dramatically. In 1981 (20 years ago), IBM changed the world when it introduced the PC, and in 1984 the Macintosh arrived, bringing well-designed and organized computing power to the masses. Shortly thereafter, hobbyists began to take advantage of emergent modem technology and created online databases, the first bulletin board systems that enabled people to send simple text messages to each other. This accelerated the modem market dramatically, and before long, data became a common component of local loop traffic. At that time, there was no concept of Instant Messenger or of the degree to which e-mail would fundamentally change the way people communicate and do business. At the same time, the business world found more and more applications for data, and the need to move that data from place to place became a major contributor to the growth in data traffic on the world s telephone networks. In those heady, early days, data did not represent a problem for the bandwidth-limited local loop. The digital information created by a computer and intended for transmission through the telephone network was received by a modem, converted into a modulated analog waveform that fell within the 4-KHz voice band, and fed to the network without incident. As we mentioned in a previous chapter, the modem s job was (and is) quite simple. Invoke the Wizard of Oz protocol: when a computer is doing the talking, the modem must make the network think it is talking to a telephone. Pay no attention to that man behind the curtain! Over time, modem technology advanced, enabling the local loop to provide higher and higher bandwidth. This increasing bandwidth was made possible through clever signaling schemes that enabled a single signaling event to transport more than a single bit. These modern modems, often called Shannon-busting modems because they defy the limits of signaling defined by Shannon, are commonplace today. They enable baud levels to reach unheard-of extremes and permit the creation of very high bit-per-signal rates. The analog local loop is used today for various voice and data applications in both business and residence markets. The new lease on life that it enjoys, thanks to advanced modem technology as well as a focus by installation personnel on the need to build clean, reliable outside plant, has resulted in the development of faster access technologies designed to operate across the analog local loop. This includes traditional high-speed modem access and such options as the Digital Subscriber Line (DSL).
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Marketplace Realities
According to a number of demographic studies conducted in the last 18 months, approximately 70 million households today host home office workers, and the number is growing rapidly. These include both telecommuters and those who are self-employed and work out of their homes. They require the ability to connect to remote local area networks (LANs) and corporate databases, retrieve e-mail, access the Web, and in some cases conduct videoconferences with colleagues and customers. The traditional bandwidth-limited local loop is not capable of satisfying these requirements with traditional modem technology. The dedicated private line service, which would solve the problem, is far too expensive as an option, and because it is dedicated, it is not particularly efficient. Other solutions are required, and these have emerged in the form of access technologies that take advantage of either a conversion to end-toend digital connectivity (Integrated Services Digital Network [ISDN]) or expanded capabilities of the traditional analog local loop (DSL or 56K modems). In some cases, a whole new architectural approach is causing excitement in the industry (Wireless Local Loop [WLL]). Finally, cable access has become a popular option as the cable infrastructure has evolved to a largely optical, all-digital system with high-bandwidth, twoway capabilities. We will discuss each of these options in the pages that follow.
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