7 © The McGraw-Hill Companies, Inc CHAPTER Connectivity, the Wireless Revolution, and Communications
7 © The McGraw-Hill Companies, Inc Objectives Connectivity Impact of wireless communications Elements of communications system –Channels –Connections –Transmissions –Network architecture and type
7 © The McGraw-Hill Companies, Inc Communication Channels Essential element of system Two categories –Physical connection –Wireless connection
7 © The McGraw-Hill Companies, Inc Wired Connections Telephone lines Coaxial cable Fiber-optic cable
7 © The McGraw-Hill Companies, Inc fiber-optic - 26,000 coaxial - 80 twisted-pair - 1 Number of Connections
7 © The McGraw-Hill Companies, Inc Wireless Connections Microwave Satellite
7 © The McGraw-Hill Companies, Inc Connection Devices Internal External Wireless
7 © The McGraw-Hill Companies, Inc Bandwidth Voiceband Medium band Broadband
7 © The McGraw-Hill Companies, Inc Serial vs. Parallel Serial –Continuous stream of bits Parallel –Simultaneously flow of bits
7 © The McGraw-Hill Companies, Inc Data Transmission Direction Simplex Half-duplex Full-duplex
7 © The McGraw-Hill Companies, Inc Protocols Set of communication rules Standard for Internet: TCP/IP
7 © The McGraw-Hill Companies, Inc Network Architecture Arrangement of communication channel How resources shared
7 © The McGraw-Hill Companies, Inc Common Terms Node Client Server NOS Distributed processing Host computer
7 © The McGraw-Hill Companies, Inc Topology Star Bus Ring Hierarchical
7 © The McGraw-Hill Companies, Inc Star network
7 © The McGraw-Hill Companies, Inc Bus network
7 © The McGraw-Hill Companies, Inc Ring network
7 © The McGraw-Hill Companies, Inc Hierarchical network
7 © The McGraw-Hill Companies, Inc Strategies Terminal system Peer-to-peer system Client/Server system Enterprise computing
7 © The McGraw-Hill Companies, Inc Network Types LAN MAN WAN
7 © The McGraw-Hill Companies, Inc Look to Future Teledisc Corporation –Microsoft and Cellular Communications
7 © The McGraw-Hill Companies, Inc. 2002