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7. CHAPTER. Connectivity, the Wireless Revolution, and Communications. Objectives. Connectivity Impact of wireless communications Elements of communications system Channels Connections Transmissions Network architecture and type. Communication Channels . Essential element of system

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  1. 7 CHAPTER Connectivity, the Wireless Revolution, and Communications © The McGraw-Hill Companies, Inc. 2002

  2. Objectives • Connectivity • Impact of wireless communications • Elements of communications system • Channels • Connections • Transmissions • Network architecture and type © The McGraw-Hill Companies, Inc. 2002

  3. Communication Channels • Essential element of system • Two categories • Physical connection • Wireless connection © The McGraw-Hill Companies, Inc. 2002

  4. Wired Connections • Telephone lines • Coaxial cable • Fiber-optic cable © The McGraw-Hill Companies, Inc. 2002

  5. Number of Connections fiber-optic - 26,000 coaxial - 80 twisted-pair - 1 © The McGraw-Hill Companies, Inc. 2002

  6. Wireless Connections • Microwave • Satellite © The McGraw-Hill Companies, Inc. 2002

  7. Connection Devices • Internal • External • Wireless © The McGraw-Hill Companies, Inc. 2002

  8. Bandwidth • Voiceband • Medium band • Broadband © The McGraw-Hill Companies, Inc. 2002

  9. Serial vs. Parallel • Serial • Continuous stream of bits • Parallel • Simultaneously flow of bits © The McGraw-Hill Companies, Inc. 2002

  10. Data Transmission Direction • Simplex • Half-duplex • Full-duplex © The McGraw-Hill Companies, Inc. 2002

  11. Protocols • Set of communication rules • Standard for Internet: TCP/IP © The McGraw-Hill Companies, Inc. 2002

  12. Network Architecture • Arrangement of communication channel • How resources shared © The McGraw-Hill Companies, Inc. 2002

  13. Node Client Server NOS Distributed processing Host computer Common Terms © The McGraw-Hill Companies, Inc. 2002

  14. Topology • Star • Bus • Ring • Hierarchical © The McGraw-Hill Companies, Inc. 2002

  15. Star network © The McGraw-Hill Companies, Inc. 2002

  16. Bus network © The McGraw-Hill Companies, Inc. 2002

  17. Ring network © The McGraw-Hill Companies, Inc. 2002

  18. Hierarchical network © The McGraw-Hill Companies, Inc. 2002

  19. Strategies • Terminal system • Peer-to-peer system • Client/Server system • Enterprise computing © The McGraw-Hill Companies, Inc. 2002

  20. Network Types • LAN • MAN • WAN © The McGraw-Hill Companies, Inc. 2002

  21. Look to Future • Teledisc Corporation • Microsoft and Cellular Communications © The McGraw-Hill Companies, Inc. 2002

  22. © The McGraw-Hill Companies, Inc. 2002

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