7 © the mcgraw-hill companies, inc. 2002 77 chapter connectivity, the wireless revolution, and...
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7777CH
AP
TE
R
Connectivity, the Wireless
Revolution, and Communications
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Objectives
• Connectivity
• Impact of wireless communications
• Elements of communications system– Channels– Connections– Transmissions– Network architecture and type
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Communication Channels
• Essential element of system
• Two categories
– Physical connection
– Wireless connection
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Wired Connections
• Telephone lines
•Coaxial cable
•Fiber-optic cable
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fiber-optic - 26,000
coaxial - 80
twisted-pair - 1
Number of Connections
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Wireless Connections
• Microwave
• Satellite
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Connection Devices
• Internal
• External
• Wireless
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Bandwidth
• Voiceband
• Medium band
• Broadband
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Serial vs. Parallel
• Serial
– Continuous stream of bits
• Parallel
– Simultaneously flow of bits
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Data Transmission Direction
• Simplex
• Half-duplex
• Full-duplex
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Protocols
• Set of communication rules
• Standard for Internet: TCP/IP
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Network Architecture
• Arrangement of
communication channel
• How resources shared
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Common Terms
• Node
• Client
• Server
• NOS
• Distributed processing
• Host computer
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Topology
• Star
• Bus
• Ring
• Hierarchical
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Star network
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Bus network
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Ring network
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Hierarchical network
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Strategies
• Terminal system
• Peer-to-peer system
• Client/Server system
• Enterprise computing
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Network Types
• LAN
• MAN
• WAN
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Look to Future
• Teledisc Corporation– Microsoft and Cellular
Communications
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