1. 7 © The McGraw-Hill Companies, Inc. 2002 77 CHAPTER Connectivity, the Wireless Revolution, and Communications

2. 7 © The McGraw-Hill Companies, Inc. 2002 Objectives Connectivity Impact of wireless communications Elements of communications system –Channels –Connections –Transmissions –Network architecture and type

3. 7 © The McGraw-Hill Companies, Inc. 2002 Communication Channels Essential element of system Two categories –Physical connection –Wireless connection

4. 7 © The McGraw-Hill Companies, Inc. 2002 Wired Connections Telephone lines Coaxial cable Fiber-optic cable

5. 7 © The McGraw-Hill Companies, Inc. 2002 fiber-optic - 26,000 coaxial - 80 twisted-pair - 1 Number of Connections

6. 7 © The McGraw-Hill Companies, Inc. 2002 Wireless Connections Microwave Satellite

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

8. 7 © The McGraw-Hill Companies, Inc. 2002 Bandwidth Voiceband Medium band Broadband

9. 7 © The McGraw-Hill Companies, Inc. 2002 Serial vs. Parallel Serial –Continuous stream of bits Parallel –Simultaneously flow of bits

10. 7 © The McGraw-Hill Companies, Inc. 2002 Data Transmission Direction Simplex Half-duplex Full-duplex

11. 7 © The McGraw-Hill Companies, Inc. 2002 Protocols Set of communication rules Standard for Internet: TCP/IP

12. 7 © The McGraw-Hill Companies, Inc. 2002 Network Architecture Arrangement of communication channel How resources shared

13. 7 © The McGraw-Hill Companies, Inc. 2002 Common Terms Node Client Server NOS Distributed processing Host computer

14. 7 © The McGraw-Hill Companies, Inc. 2002 Topology Star Bus Ring Hierarchical

15. 7 © The McGraw-Hill Companies, Inc. 2002 Star network

16. 7 © The McGraw-Hill Companies, Inc. 2002 Bus network

17. 7 © The McGraw-Hill Companies, Inc. 2002 Ring network

18. 7 © The McGraw-Hill Companies, Inc. 2002 Hierarchical network

19. 7 © The McGraw-Hill Companies, Inc. 2002 Strategies Terminal system Peer-to-peer system Client/Server system Enterprise computing

20. 7 © The McGraw-Hill Companies, Inc. 2002 Network Types LAN MAN WAN

21. 7 © The McGraw-Hill Companies, Inc. 2002 Look to Future Teledisc Corporation –Microsoft and Cellular Communications

22. 7 © The McGraw-Hill Companies, Inc. 2002