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As interest grew in the late 1990s for broadband access to data services over cable television networks, CableLabs , working closely with the ITU and major hardware vendors, crafted a standard known as the Data Over Cable Service Interface Specification, or DOCSIS . The standard is designed to ensure interoperability among cable modems as well as to assuage concerns about data security over shared cable systems, DOCSIS has done a great deal to resolve marketplace issues.
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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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Under the standards, CableLabs crafted an original cable modem certification standard called DOCSIS 1.0 which guarantees that modems carrying the certification will interoperate with any headend equipment, are ready to be sold in the retail market, and will interoperate with other certified cable modems. Engineers from Askey, Broadcom, Cisco Systems, Ericsson, General Instrument, Motorola, Philips, 3Com, Panasonic, Digital Furnace, Thomson, Terayon, Toshiba, and Com21 participated in the development effort. The DOCSIS 1.1 specification was released in April 1999, and included two additional functional descriptions, which began to be implemented in 2000. The first specification details procedures for guaranteed bandwidth, as well as a specification for quality of service guarantees. The second specification is called Baseline Privacy Interface Plus (BPI ); it enhances the current security capability of the DOCSIS standards through the addition of digital certificate-based authentication and support for multicast services to customers.
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In December 2002 the ITU-T announced the approval of a standard defining the second-generation data over cable system, known as DOCSIS 2.0. ITU recommendation J.122 gives cable operators the ability to offer speeds up to 600 times faster than a standard dial-up telephone modem provides. The new standard can be used as the foundation upon which IP-based telephony services can be offered. The enhancements that J.122 provides over its predecessor are primarily focused on the upstream transmission path from the customer to the network. Changes include increased capacity and improved robustness over the upstream path. While the DOCSIS name is in widespread use, CableLabs now refers to the overall effort as the CableLabs Certified Cable Modem Project.
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To understand wireless communications it is necessary to examine both radio and telephone technologies, because the two are inextricably intertwined. In 1876, Alexander Graham Bell, a part-time inventor and
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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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a teacher of hearing-impaired students, invented the telephone while attempting to resolve the challenge of transmitting multiple telegraph signals over a shared pair of wires. His invention changed the world forever. In 1896, a mere 20 years later, Italian engineer and inventor Guglielmo Marconi developed the spark gap radio transmitter, which eventually allowed him to transmit long-wave radio signals across the Atlantic Ocean as early as 1901. Like Bell, his invention changed the world; for his contributions, he was awarded the Nobel Prize in 1909. It wasn t until the 1920s, though, when these two technologies began to dovetail, that their true promise was realized. Telephony provided interpersonal, two-way, high-quality voice communications, but required the user to be stationary. Radio, on the other hand, provided mobile communications, but was limited by distance, environmentally induced signal degradation, and spectrum availability. Whereas telephony was advertised as a universally available service, radio was more of a catchas-catch-can offering that was subject to severe blocking. If a system could be developed that combined the signal quality and ubiquity of telephony with the mobility of radio, however, a truly promising new service offering could be made available. Today, cellular telephony (and other services like it) provides highquality, almost ubiquitous, wireless telephone service. Thanks to advances in digital technology, wireless telephony also offers services identical to those provided by the wired network. And pricing for wired and wireless services are now reaching parity: Flat-rate nationwide pricing models are commonplace today that have no roaming or longdistance restrictions.
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