614 essentials of business information systems

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Unformatted text preview: e transmitted independently over various Communications channels and reassembled at their final destination. 6.14 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless Telecommunications and Networking in Today’s Business World Key Digital Networking Technologies • TCP/IP and connectivity • Connectivity between computers enabled by protocols • Protocols: Rules that govern transmission of information between two points • Transmission Control Protocol/Internet Protocol (TCP/IP) • Common worldwide standard that is basis for Internet • Department of Defense reference model for TCP/IP • Four layers • Application layer • Transport layer • Internet layer • Network interface layer 6.15 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless Telecommunications and Networking in Today’s Business World The Transmission Control Protocol/Internet The Protocol (TCP/IP) Reference Model Protocol Figure 6-4 This figure illustrates the four layers of the TCP/IP reference model for communications. 6.16 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless Communications Networks Types of Networks • Signals: digital vs. analog • Modem: Translates digital signals into analog form • Local-area networks (LANs) • Campus-area networks (CANs) • Peer-to-peer • Topologies: star, bus, ring • Metropolitan and wide-area networks • Wide-area networks (WANs) • Metropolitan-area networks (MANs) 6.17 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless Communications Networks Functions of the Modem A modem is a device that translates digital signals from a computer into analog form so that they can be transmitted over analog telephone lines. The modem also translates analog signals back into digital form for the receiving computer. Figure 6-5 6.18 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless Communications Networks Network Topologies Figure 6-6 The three basic network topologies are the bus, star, and ring. 6.19 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless Communications Networks Physical Transmission Media • Twisted wire (modems) • Coaxial cable • Fiber optics and optical networks • Dense wavelength division multiplexing (DWDM) • Wireless transmission media and devices • Microwave • Satellites • Cellular telephones • Transmission speed (hertz, bandwidth) 6.20 Essentials of Business Information Systems Chapter 6 Telecommunications, the Internet, and Chapter Wireless Technology Wireless Communications Networks BP Amoco’s Satellite Transmission System Figure 6-7 Communication satellites help BP Amoco transfer seismic data between oil exploration ships and research centers in the United States. 6...
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This document was uploaded on 02/11/2014.

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