Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.1 © 2005 by Prentice Hall Telecommunications, Networks, and Wireless Computing Chapter 8

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.2 © 2005 by Prentice Hall Objectives 1.What are the features of a contemporary corporate telecommunications system? On what major technology developments are they based? 2.What telecommunications transmission media should our organization use? 3.What kind of networks and network services are appropriate for our organization?

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.3 © 2005 by Prentice Hall Objectives 4.What telecommunications applications can be used for electronic business and electronic commerce? 5.What issues should be addressed in telecommunications planning?

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.4 © 2005 by Prentice Hall Management Challenges 1.Selecting appropriate technologies for enterprise networking 2.Managing bandwidth

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.5 © 2005 by Prentice Hall Telecommunications System Facilitation of electronic communication Telephone systems Broadcast and cable TV Radio, satellite, and local area networks Internet Analog or digital The Corporate Telecommunications System

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.6 © 2005 by Prentice Hall Three Major Developments Shaping Contemporary Systems 1.Client/server computing 2.Packet switching 3.TCP/IP and other communications standards The Corporate Telecommunications System Features of Contemporary Telecommunications Systems

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.7 © 2005 by Prentice Hall The Corporate Telecommunications System A corporate telecommunications system Figure 8-1

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.8 © 2005 by Prentice Hall Client/Server Computing Powerful personal computers connect to network with one or more server computers Has extended networking to parts of business that could not be served by centralized architecture Processing load balanced over many smaller machines The Corporate Telecommunications System Features of Contemporary Telecommunications Systems

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.9 © 2005 by Prentice Hall Packet Switching Messages broken into “packets” before transmission Packets include destination and error-checking information Packets travel independently using routers; reassembled into original message at destination The Corporate Telecommunications System Features of Contemporary Telecommunications Systems

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.10 © 2005 by Prentice Hall The Corporate Telecommunications System Packet-switched networks and packet communications Figure 8-2

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.11 © 2005 by Prentice Hall TCP/IP Transmission Control Protocol/Internet Protocol Open suite of protocols for connectivity developed in 1970s Provides standards for breaking messages into packets, routing them to destination addresses, and reassembling them at end Allows for communication regardless of hardware/software The Corporate Telecommunications System Features of Contemporary Telecommunications Systems

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.12 © 2005 by Prentice Hall TCP/IP: Four-Layer Reference Model 1.Application layer: Communication between applications and other layers 2.Transport layer: Acknowledging and sequencing packets to/from application 3.Internet layer: Addressing, routing, packaging data packets 4.Network interface layer: Placing packets on and receiving them from network medium The Corporate Telecommunications System Features of Contemporary Telecommunications Systems

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.13 © 2005 by Prentice Hall The Corporate Telecommunications System The Transmission Control Protocol/Internet Protocol (TCP/IP) reference model Figure 8-3

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.14 © 2005 by Prentice Hall Twisted wire Copper wire twisted in pairs Older analog transmission medium Can be used for digital signals Modems used for translating analog to digital Coaxial cable: Insulated copper wire Faster, more interference-free than twisted pair Difficult to install; doesn’t support analog signals The Corporate Telecommunications System Transmission Media

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.15 © 2005 by Prentice Hall The Corporate Telecommunications System Functions of the modem Figure 8-4

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.16 © 2005 by Prentice Hall Fiber optics Strands of clear glass fiber bound into cables Data sent as pulses of light Faster, lighter, more durable Difficult to install; more expensive Used in high-capacity optical networks Currently slowed by need to convert back and forth to electrical data Can use multiplexing; allows one channel to carry several transmissions The Corporate Telecommunications System Transmission Media

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.17 © 2005 by Prentice Hall Wireless Transmission Use electromagnetic spectrum Microwave and infrared use high-frequency radio signals Paging systems, cellular telephones, PDAs, mobile data networks Wireless communication requires compatible standards Security/privacy issues The Corporate Telecommunications System Transmission Media

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.18 © 2005 by Prentice Hall The Corporate Telecommunications System Frequency ranges for communication media and devices Figure 8-5

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.19 © 2005 by Prentice Hall The Corporate Telecommunications System Amoco’s satellite transmission system Figure 8-6

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.20 © 2005 by Prentice Hall Transmission Speed Bps: Bits per second Baud rate: Rate of signal changes One signal change = cycle Transmission capacity is function of frequency Bandwidth: Range of frequencies accommodated on a particular channel The Corporate Telecommunications System Transmission Media

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.21 © 2005 by Prentice Hall The Corporate Telecommunications System Transmission Speed Transmission Media Twisted wireUp to 100 MbpsLow cost MicrowaveUp to 200+ Mbps SatelliteUp to 200+ Mbps Coaxial cableUp to 200 Mbps Fiber-optic cableUp to 6+ TbpsHigh cost

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.22 © 2005 by Prentice Hall Connects computers and other digital devices within 2000 ft radius Cabling or wireless technology links computers, network interface cards, and software Ethernet Network Operating System (NOS) Client/server or peer-to-peer architecture Star, bus, and ring topologies Communications Networks Local Area Networks

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.23 © 2005 by Prentice Hall Communications Networks A local area network (LAN) Figure 8-7

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.24 © 2005 by Prentice Hall Communications Networks Network topologies Figure 8-8

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.25 © 2005 by Prentice Hall Use radio waves to connect stations b: Current standard; 54 Mbps in 2.4 GHz range Infrastructure mode: Wireless devices communicate with wired LAN via access points Ad-hoc mode: Peer-to-peer mode; wireless devices communicate with each other directly Communications Networks Wireless Networks: Wi-Fi and Bluetooth

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.26 © 2005 by Prentice Hall Communications Networks An wireless LAN Figure 8-9

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.27 © 2005 by Prentice Hall Hot spot: Geographic location in which an access point provides public Wi-Fi network service Bluetooth: Standard for wireless personal area networks that can transmit up to 722 Kbps within 10-meter area Communications Networks Wireless Networks: Wi-Fi and Bluetooth

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.28 © 2005 by Prentice Hall Span broad geographic distances Can consist of combination of: Switched lines Dedicated lines Microwave Satellite communications Private WANs expensive to support Communications Networks Wide Area Networks

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.29 © 2005 by Prentice Hall Metropolitan Area Network (MAN) Scope between LAN and WAN Limited distance; faster and less expensive than WAN Value-Added Networks Private, third-party managed, data only networks Subscription basis Communications Networks Wide Area Networks

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.30 © 2005 by Prentice Hall 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 Networks Window on Organizations

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.31 © 2005 by Prentice Hall Frame relay Asynchronous transfer mode (ATM) Integrated Services Digital Network (ISDN) Digital subscriber line (DSL) T1 line Network convergence Communications Networks Broadband Network Services and Technologies

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.32 © 2005 by Prentice Hall Eliminates telephone tag and costly long-distance telephone charges Groupware Enables work groups at different locations to participate in discussion forums and work on shared documents and projects Electronic Business and Electronic Commerce Technologies Electronic Mail and Groupware

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.33 © 2005 by Prentice Hall Monitoring Employees on Networks: Unethical or Good Business? Should managers monitor employee and Internet usage? Why or why not? Describe an effective and Web use policy for a company. Electronic Business and Electronic Commerce Technologies Window on Management

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.34 © 2005 by Prentice Hall Voice mail Digitizes spoken message and transmits it over a network Fax Digitizes and transmits documents over telephone lines Electronic Business and Electronic Commerce Technologies Voice Mail and Fax

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.35 © 2005 by Prentice Hall Teleconferencing Ability to confer with a group of people simultaneously Data conferencing Two or more users can edit and modify data files simultaneously Videoconferencing Participants are able to see each other over video screens Electronic Business and Electronic Commerce Technologies Teleconferencing, Dataconferencing, and Videoconferencing

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.36 © 2005 by Prentice Hall Digital Information Services: Online services providing general and business information, such as LexisNexis, AOL, Dow Jones News Distance learning Education or training delivered over a distance to individuals in one or more locations E-learning Instruction delivered online using the Internet or private networks Electronic Business and Electronic Commerce Technologies Digital Information Services, Distance Learning, and E-Learning

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.37 © 2005 by Prentice Hall Computer-to-computer exchange between two organizations of standard transaction documents, such as invoices, purchase orders Minimizes paper-handling and data input; lowers transaction costs Transmits structured data with fields, unlike e- mail Electronic Business and Electronic Commerce Technologies Electronic Data Interchange

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.38 © 2005 by Prentice Hall Electronic Business and Electronic Commerce Technologies Electronic data interchange (EDI) Figure 8-10

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.39 © 2005 by Prentice Hall 1.Distance 2.Services 3.Points of access 4.Utilization 5.Cost 6.Security 7.Connectivity Developing a Business-Driven Telecommunications Plan Implementation Issues: Seven Factors

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.40 © 2005 by Prentice Hall 1.Analyze Delta using the competitive forces and value chain models. 2.What is Delta’s business strategy? What is the role of information systems and telecommunications technology in this strategy? Chapter 8 Case Study Will New Systems Keep Delta Flying?

Essentials of Management Information Systems, 6e Chapter 8 Telecommunications, Networks, and Wireless Computing 8.41 © 2005 by Prentice Hall 3.Assess Delta’s Digital Nervous System (DNS) effort. What value does it provide the company? How does it support Delta’s business strategy? 4.What problems at Delta can be solved with information systems? What problems cannot be solved with systems? Chapter 8 Case Study Will New Systems Keep Delta Flying?