The Internet is a global network of close to 100 million people. It provides a vast range of telecommunication services, including electronic mail, the World Wide Web, and more recently, telephony. With appropriate software that can be downloaded free, users who are logged onto the Internet can talk to each other anywhere in the world at no additional cost. Recently, some companies have started services that allow such users to even talk to people who do not have an Internet connection, but only a regular phone, at a cost far below regular long ....etc

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Definition
Satellites have been used for years to provide communication network links. Historically, the use of satellites in the Internet can be divided into two generations. In the first generation, satellites were simply used to provide commodity links (e.g., T1) between countries. Internet Protocol (IP) routers were attached to the page link endpoints to use the links as single-hop alternatives to multiple terrestrial hops. Two characteristics marked these first-generation systems: they had limited bandwidth, and they had large latencies t ....etc

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VoIP, or Voice over Internet Protocol refers to sending voice and fax phone calls over data networks, particularly the Internet. This technology offers cost savings by making more efficient use of the existing network.
Traditionally, voice and data were carried over separate networks optimized to suit the differing characteristics of voice and data traffic. With advances in technology, it is now possible to carry voice and data over the same networks whilst still catering for the different characteristics required by voice and data.
Voice-ov ....etc

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Introduction
The number of subscribers with wireless access to the Internet through laptops, personal digital assistants (PDAs), cellular phones, pagers, and other wireless devices is rapidly increasing. In 1998, 1.2 million people had wireless web access. IDC predicts that in 2003 the number of wireless Internet subscribers will be 40.4 million. Because this market is growing at such a fast rate, content providers see an opportunity to enter the market by forming partnerships with wireless carriers to deliver data applications to wireless dev ....etc

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Definition
Over the last decade, the growth of satellite service, the rise of digital cable, and the birth of HDTV have all left their mark on the television landscape. Now, a new delivery method threatens to shake things up even more powerfully. Internet Protocol Television (IPTV) has arrived, and backed by the deep pockets of the telecommunications industry, it's poised to offer more interactivity and bring a hefty dose of competition to the business of selling TV.

IPTV describes a system capable of receiving and displaying a video stream ....etc

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Definition

TCP/IP
TCP/IP is a set of protocols developed to allow cooperating computers to share resources across a network. It was developed by a community of researchers centered around the ARPAnet. Certainly theARPAnet is the best-known TCP/IP network. However as of June, 87, at least 130 different vendors had products that support TCP/IP, and thousands of networks of all kinds use it. First some basic definitions. The most accurate name for the set of protocols we are describing is the Internet protocol suite. TCP and IP are two of th ....etc

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