8.1 © 2006 by Prentice Hall Telecommunications, the Internet, & Wireless Technology Telecommunications, the Internet, & Wireless Technology

8.2 © 2006 by Prentice Hall TELECOMMUNICATIONS AND NETWORKING A networking and communications revolution led by Internet-based technologies 1 billion instant messages per day 4 billion s each day 65 million music files downloaded

8.3 © 2006 by Prentice Hall $769 billion spent in the United States on telecommunications equipment and services Today, networking and the Internet are synonymous with doing business.

8.4 © 2006 by Prentice Hall Outline Telecommunications & Networking Communication Networks The Internet The Wireless Revolution

8.5 © 2006 by Prentice Hall Outline Telecommunications & Networking

8.6 © 2006 by Prentice Hall Telecommunications environment provides connectivity by providing communication channels for text, voice, and video images. The Business Telecommunications Environment

8.7 © 2006 by Prentice Hall Components of a Simple Network Figure 8-4

8.8 © 2006 by Prentice Hall A network consists of two or more connected computers. Each computer on the network contains a network interface device called a network interface card (NIC). The connection medium for linking network components can be a telephone wire, coaxial cable, or radio signal in the case of cell phone and wireless local area networks. Networks and Corporate Infrastructure

8.9 © 2006 by Prentice Hall The network operating system (NOS) routes and manages communications on the network and coordinates network resources. Networks also contain a switch or a hub acting as a connection point between the computers. Hubs are very simple devices that connect network components, sending a packet of data to all other connected devices. Networks and Corporate Infrastructure (Continued)

8.10 © 2006 by Prentice Hall Corporate Network Infrastructure Figure 8-2

8.11 © 2006 by Prentice Hall The major trends in telecommunications: Rapid technological innovation has resulted in a proliferation of new hardware devices and new alternatives for business communications. Continuing telecommunications deregulation has encouraged competition and created many alternatives. Networking and Communications Trends

8.12 © 2006 by Prentice Hall Growing dominance of Internet technologies in voice, video, and data communications Networking and Communications Trends (Continued)

8.13 © 2006 by Prentice Hall Rapid growth in wireless telephone, wireless computer networks, and mobile Internet devices Growing scope of communication-intense services and products Networking and Communications Trends (Continued)

8.14 © 2006 by Prentice Hall Client/Server Computing Packet Switching TCP/IP and Connectivity Key Digital Networking Technologies

8.15 © 2006 by Prentice Hall Client/server computing is a distributed computing model in which some of the processing power is located within small, inexpensive client computers. Client/Server Computing:

8.16 © 2006 by Prentice Hall Packed-Switched Networks and Packet Communications Figure 8-5

8.17 © 2006 by Prentice Hall In packet-switched networks, messages are first broken down into small bundles of data called packets. These packets are sent along different communication paths and then the packets are reassembled once they reach their destinations. Packet Switching:

8.18 © 2006 by Prentice Hall Packet switching makes more efficient use of the communications capacity of a network. The packets include information for directing the packet to the right address and for checking transmission errors along with the data. Packet Switching: (Continued)

8.19 © 2006 by Prentice Hall TCP/IP is the communications protocol used by the Internet and all Internet devices. TCP/IP provides for breaking up digital messages into packets, routing them to the proper addresses, and then reassembling them into coherent messages. TCP/IP uses a suite of protocols: TCP and IP. TCP/IP and Connectivity:

8.20 © 2006 by Prentice Hall Outline Telecommunications & Networking Communication Networks

8.21 © 2006 by Prentice Hall Signals & the Modem Figure 8-7

8.22 © 2006 by Prentice Hall Types of Networks TypeArea Local Area Network (LAN)Up to 500 meters (half a mile); an office or floor of a building Campus Area Network (CAN)Up to 1,000 meters (a mile); a college campus or corporate facility Metropolitan Area Network (MAN) A city or metropolitan area Wide Area Network (WAN)Transcontinental or global area

8.23 © 2006 by Prentice Hall Twisted Wire Coaxial Cable Fiber Optics and Optical Networks Wireless Transmission Physical Transmission Media The different kinds of physical transmission media used by the networks are:

8.24 © 2006 by Prentice Hall Broadband Network Services and Technologies A number of network services and technologies are available to companies that need high-speed transmission or access to the Internet.

8.25 © 2006 by Prentice Hall Outline Telecommunications & Networking Communication Networks The Internet

8.26 © 2006 by Prentice Hall THE INTERNET A network composed of computers and other devices that are logically linked together by a unique address space based on the Internet Protocol

8.27 © 2006 by Prentice Hall The Domain Name System THE INTERNET Figure 8-9

8.28 © 2006 by Prentice Hall THE INTERNET Person-to-person messaging; document sharing Usenet newsgroups: Discussion groups on electronic bulletin boards LISTSERVs: Discussion groups using mailing list servers Chatting and instant messaging: Interactive conversations Major Internet Services Table 8-6

8.29 © 2006 by Prentice Hall Telnet: Logging on to one computer system and doing work on another FTP: Transferring files from computer to computer World Wide Web: Retrieving, formatting, and displaying information (including text, audio, graphics, and video) using hypertext links Major Internet Services (Continued) Table 8-6 (Continued)

8.30 © 2006 by Prentice Hall Client/server Computing on the Internet Figure 8-11

8.31 © 2006 by Prentice Hall Hypertext Uniform Resource Locator (URL) Web servers Website Web page, Home page Searching for information on the Web The World Wide Web

8.32 © 2006 by Prentice Hall Major Web Server Providers Figure 8-12 Source: Based on data from Netcraft Web Server Survey, July 2004,

8.33 © 2006 by Prentice Hall THE INTERNET The Internet lowers search costs Search engines Intelligent agents and shopping bots Broadcast and push technology Search engine marketing Searching and Finding Information on the Internet

8.34 © 2006 by Prentice Hall THE INTERNET Wikis Blogs RSS – Really Simple Syndication Web 2.0

8.35 © 2006 by Prentice Hall Intranets: An intranet is an internal organizational network that provides access to data across a business firm. Firewall Extranets: Allow authorized vendors and customers to have limited access to its internal intranet Intranets and Extranets

8.36 © 2006 by Prentice Hall Groupware: Provides capabilities for supporting enterprise-wide communication and collaborative work Electronic conferencing tools: Provides a virtual conference table where participants can view and modify documents and slides or share their thoughts and comments using chat, audio, or video Groupware and Electronic Conferencing

8.37 © 2006 by Prentice Hall Voice over IP (VoIP) technology: Uses the Internet Protocol (IP) to deliver voice information in digital form using packet switching Unified messaging systems: Combine voice mail, e- mail, and faxes so they can all be obtained from one system Internet Telephony

8.38 © 2006 by Prentice Hall How IP Telephony Works Figure 8-13

8.39 © 2006 by Prentice Hall The Growth of Internet Telephony Figure 8-14 Source: Infotech and authors.

8.40 © 2006 by Prentice Hall A virtual private network based on the Internet Protocol provides a secure connection between two points across the Internet, enabling private communications to travel securely over the public infrastructure Virtual Private Networks

8.41 © 2006 by Prentice Hall Outline Telecommunications & Networking Communication Networks The Internet The Wireless Revolution

8.42 © 2006 by Prentice Hall Mobile phones Laptops PDA’s handhelds (e.g. Blackberry) Smart phones (Hybrid – phone + PDA) Wireless Revolution

8.43 © 2006 by Prentice Hall GSM – Global System for Mobile Communication o International roaming CDMA – Code Division Multiple Access o Cheaper o Higher quality voice Cellular Network Standards

8.44 © 2006 by Prentice Hall Bluetooth PAN, 8 devices, 30’ radius Wi-Fi Access point Range - 300’ WiMax Range – 31 miles 75 mbs Broadband cellular access for PC’s Wireless Computer Networks

8.45 © 2006 by Prentice Hall Summary Telecommunications & Networking Communication Networks The Internet The Wireless Revolution