(Telecommunications, Networks, and Wireless Computing (Chapter 8
اسلاید 1: Telecommunications, Networks, and Wireless ComputingChapter 8
اسلاید 2: ObjectivesWhat are the features of a contemporary corporate telecommunications system? On what major technology developments are they based?What telecommunications transmission media should our organization use?What kind of networks and network services are appropriate for our organization?
اسلاید 3: ObjectivesWhat telecommunications applications can be used for electronic business and electronic commerce?What issues should be addressed in telecommunications planning?
اسلاید 4: Management ChallengesSelecting appropriate technologies for enterprise networkingManaging bandwidth
اسلاید 5: Telecommunications SystemFacilitation of electronic communicationTelephone systemsBroadcast and cable TVRadio, satellite, and local area networksInternetAnalog or digitalThe Corporate Telecommunications System
اسلاید 6: Three Major Developments Shaping Contemporary SystemsClient/server computingPacket switchingTCP/IP and other communications standardsThe Corporate Telecommunications SystemFeatures of Contemporary Telecommunications Systems
اسلاید 7: The Corporate Telecommunications SystemA corporate telecommunications systemFigure 8-1
اسلاید 8: Client/Server ComputingPowerful personal computers connect to network with one or more server computersHas extended networking to parts of business that could not be served by centralized architectureProcessing load balanced over many smaller machinesThe Corporate Telecommunications SystemFeatures of Contemporary Telecommunications Systems
اسلاید 9: Packet SwitchingMessages broken into “packets” before transmissionPackets include destination and error-checking information Packets travel independently using routers; reassembled into original message at destinationThe Corporate Telecommunications SystemFeatures of Contemporary Telecommunications Systems
اسلاید 10: The Corporate Telecommunications SystemPacket-switched networks and packet communicationsFigure 8-2
اسلاید 11: TCP/IPTransmission Control Protocol/Internet ProtocolOpen suite of protocols for connectivity developed in 1970sProvides standards for breaking messages into packets, routing them to destination addresses, and reassembling them at endAllows for communication regardless of hardware/softwareThe Corporate Telecommunications SystemFeatures of Contemporary Telecommunications Systems
اسلاید 12: TCP/IP: Four-Layer Reference ModelApplication layer: Communication between applications and other layersTransport layer: Acknowledging and sequencing packets to/from applicationInternet layer: Addressing, routing, packaging data packetsNetwork interface layer: Placing packets on and receiving them from network mediumThe Corporate Telecommunications SystemFeatures of Contemporary Telecommunications Systems
اسلاید 13: The Corporate Telecommunications SystemThe Transmission Control Protocol/Internet Protocol (TCP/IP) reference modelFigure 8-3
اسلاید 14: Twisted wireCopper wire twisted in pairsOlder analog transmission mediumCan be used for digital signalsModems used for translating analog to digitalCoaxial cable:Insulated copper wireFaster, more interference-free than twisted pairDifficult to install; doesn’t support analog signalsThe Corporate Telecommunications SystemTransmission Media
اسلاید 15: The Corporate Telecommunications SystemFunctions of the modemFigure 8-4
اسلاید 16: Fiber opticsStrands of clear glass fiber bound into cablesData sent as pulses of lightFaster, lighter, more durable Difficult to install; more expensiveUsed in high-capacity optical networksCurrently slowed by need to convert back and forth to electrical dataCan use multiplexing; allows one channel to carry several transmissionsThe Corporate Telecommunications SystemTransmission Media
اسلاید 17: Wireless TransmissionUse electromagnetic spectrumMicrowave and infrared use high-frequency radio signalsPaging systems, cellular telephones, PDAs, mobile data networksWireless communication requires compatible standardsSecurity/privacy issuesThe Corporate Telecommunications SystemTransmission Media
اسلاید 18: The Corporate Telecommunications SystemFrequency ranges for communication media and devicesFigure 8-5
اسلاید 19: The Corporate Telecommunications SystemAmoco’s satellite transmission systemFigure 8-6
اسلاید 20: Transmission SpeedBps: Bits per secondBaud rate: Rate of signal changes One signal change = cycleTransmission capacity is function of frequencyBandwidth: Range of frequencies accommodated on a particular channelThe Corporate Telecommunications SystemTransmission Media
اسلاید 21: The Corporate Telecommunications SystemTransmission SpeedTransmission Media
اسلاید 22: Connects computers and other digital devices within 2000 ft radiusCabling or wireless technology links computers, network interface cards, and softwareEthernetNetwork Operating System (NOS)Client/server or peer-to-peer architectureStar, bus, and ring topologiesCommunications NetworksLocal Area Networks
اسلاید 23: Communications NetworksA local area network (LAN)Figure 8-7
اسلاید 24: Communications NetworksNetwork topologiesFigure 8-8
اسلاید 25: Use radio waves to connect stations802.11b: Current standard; 54 Mbps in 2.4 GHz rangeInfrastructure mode: Wireless devices communicate with wired LAN via access pointsAd-hoc mode: Peer-to-peer mode; wireless devices communicate with each other directlyCommunications NetworksWireless Networks: Wi-Fi and Bluetooth
اسلاید 26: Communications NetworksAn 802.11 wireless LANFigure 8-9
اسلاید 27: Hot spot: Geographic location in which an access point provides public Wi-Fi network serviceBluetooth: Standard for wireless personal area networks that can transmit up to 722 Kbps within 10-meter areaCommunications NetworksWireless Networks: Wi-Fi and Bluetooth
اسلاید 28: Span broad geographic distancesCan consist of combination of:Switched linesDedicated linesMicrowaveSatellite communicationsPrivate WANs expensive to supportCommunications NetworksWide Area Networks
اسلاید 29: Metropolitan Area Network (MAN)Scope between LAN and WANLimited distance; faster and less expensive than WANValue-Added NetworksPrivate, third-party managed, data only networksSubscription basisCommunications NetworksWide Area Networks
اسلاید 30: Is the World Falling for Wi-Fi?What management, organization, and technology factors account for different patterns of Wi-Fi adoption in various countries?What value can Wi-Fi service provide to businesses?Communications NetworksWindow on Organizations
اسلاید 31: Frame relayAsynchronous transfer mode (ATM)Integrated Services Digital Network (ISDN)Digital subscriber line (DSL)T1 lineNetwork convergenceCommunications NetworksBroadband Network Services and Technologies
اسلاید 32: E-mail Eliminates telephone tag and costly long-distance telephone chargesGroupware Enables work groups at different locations to participate in discussion forums and work on shared documents and projectsElectronic Business and Electronic Commerce TechnologiesElectronic Mail and Groupware
اسلاید 33: Monitoring Employees on Networks: Unethical or Good Business?Should managers monitor employee e-mail and Internet usage? Why or why not? Describe an effective e-mail and Web use policy for a company.Electronic Business and Electronic Commerce TechnologiesWindow on Management
اسلاید 34: Voice mailDigitizes spoken message and transmits it over a networkFaxDigitizes and transmits documents over telephone linesElectronic Business and Electronic Commerce TechnologiesVoice Mail and Fax
اسلاید 35: TeleconferencingAbility to confer with a group of people simultaneouslyData conferencingTwo or more users can edit and modify data files simultaneouslyVideoconferencingParticipants are able to see each other over video screensElectronic Business and Electronic Commerce TechnologiesTeleconferencing, Dataconferencing, and Videoconferencing
اسلاید 36: Digital Information Services:Online services providing general and business information, such as LexisNexis, AOL, Dow Jones NewsDistance learningEducation or training delivered over a distance to individuals in one or more locationsE-learningInstruction delivered online using the Internet or private networksElectronic Business and Electronic Commerce TechnologiesDigital Information Services, Distance Learning, and E-Learning
اسلاید 37: Computer-to-computer exchange between two organizations of standard transaction documents, such as invoices, purchase ordersMinimizes paper-handling and data input; lowers transaction costsTransmits structured data with fields, unlike e-mailElectronic Business and Electronic Commerce TechnologiesElectronic Data Interchange
اسلاید 38: Electronic Business and Electronic Commerce TechnologiesElectronic data interchange (EDI)Figure 8-10
اسلاید 39: DistanceServicesPoints of accessUtilizationCostSecurityConnectivityDeveloping a Business-Driven Telecommunications PlanImplementation Issues: Seven Factors
اسلاید 40: Analyze Delta using the competitive forces and value chain models.What is Delta’s business strategy? What is the role of information systems and telecommunications technology in this strategy?Chapter 8 Case StudyWill New Systems Keep Delta Flying?
اسلاید 41: Assess Delta’s Digital Nervous System (DNS) effort. What value does it provide the company? How does it support Delta’s business strategy?What problems at Delta can be solved with information systems? What problems cannot be solved with systems?Chapter 8 Case StudyWill New Systems Keep Delta Flying?
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