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Chapter 4 Telecom and Networks
1.
1 Chapter
4 Telecommunications and Networks McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
2.
2
Learning Objectives Identify major developments and trends in the industries, technologies, and business applications of telecommunications and Internet technologies. Provide examples of the business value of Internet, intranet, and extranet applications. McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
3.
3
Learning Objectives (continued) Identify the basic components, functions, and types of telecommunications networks used in business. Explain the functions of major types of telecommunications network hardware, software, media, and services. McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
4.
4
Section I The Networked Enterprise McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
5.
5
Networking the Enterprise Networking business and employees Connecting them to customers, suppliers, and other stakeholders. McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
6.
6
Trends in Telecommunications McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
7.
7
Trends in Telecommunications (continued) Industry More competitive More options for the firm Technology Unrestricted connectivity Easy access for end users Open systems Use common standards for hardware, software, applications, & networking. McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
8.
8
Trends in Telecommunications (continued) Technology (continued) High degree of interoperability Digital networks Higher transmission speeds Moves larger amounts of information Greater economy Lower error rates Multiple types of communications on the same circuits McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
9.
9
Trends in Telecommunications (continued) Technology (continued) Fiber-optic lines & cellular, PCS, satellite & other wireless technologies Faster transmission speeds McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
10.
10
Trends in Telecommunications (continued) Business applications Dramatic increase in the number of feasible telecommunication applications. Cut costs, reduce lead times, shorten response times, support e-commerce, improve collaboration, share resources, lock in customers & suppliers, & develop new products & services McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
11.
11
Business Value of Telecommunications Networks McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
12.
12
The Internet A network of networks Popular uses E-mail Instant messaging Browsing the World Wide Web Newsgroups and chat rooms McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
13.
13
The Internet (continued) The business value of the Internet McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
14.
14
Intranets Within an organization Uses Internet technologies Business value of Intranets Used for information sharing, communication, collaboration, & support of business processes. Web publishing Comparatively easy, attractive, & lower cost alternative for publishing & accessing multimedia business information McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
15.
15
Intranets (continued) Business Operations & Management Used for developing & deploying critical business applications Supports operations and managerial decision making McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
16.
16
Extranets Network links that use Internet technologies to interconnect the firm’s intranet with the intranets of customers, suppliers, or other business partners Consultants, subcontractors, business prospects, & others McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
17.
17
Extranets (continued) Business value Improve communication with customers and business partners Gain competitive advantage in Product development Cost savings Marketing Distribution Leveraging their partnerships McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
18.
18
Section II Telecommunications Network Alternatives McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
19.
19 Telecommunications
Network Alternatives McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
20.
20
A Telecommunications Network Model McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
21.
21
A Telecommunications Network Model (continued) Consists of five basic components Terminals Any input/output device that uses telecommunication networks to transmit or receive data Telecommunication processors Support data transmission and reception between terminals and computers McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
22.
22
A Telecommunications Network Model (continued) Telecommunications channels The medium over which data are transmitted and received Computers Interconnected by telecommunications networks Telecommunications control software Control telecommunications activities & manage the functions of telecommunications networks McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
23.
23
Types of Telecommunications Networks Wide Area Networks (WAN) Cover a large geographic area. Local Area Networks (LAN) Connect computers & other information processing devices within a limited physical area. Connected via ordinary telephone wiring, coaxial cable, or wireless radio & infrared systems McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
24.
24
Types of Telecommunications Networks (continued) Virtual Private Networks A secure network that uses the Internet as its main backbone network, but relies on fire walls and other security features McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
25.
25
Types of Telecommunications Networks (continued) McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
26.
26
Types of Telecommunications Networks (continued) Client/Server Networks Clients – end user PCs or NCs Server – helps with application processing and also manages the network McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
27.
27
Types of Telecommunications Networks (continued) McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
28.
28
Types of Telecommunications Networks (continued) Network computing “the network is the computer” Thin clients process small application programs called “applets.” McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
29.
29
A Telecommunications Network Model (continued) Peer-to-Peer (P2P) Two major models Central server architecture Pure peer-to-peer McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
30.
30
Telecommunications Media Twisted-pair wire Coaxial cable Minimizes interference and distortion Allows high-speed data transmission Fiber optics Glass fiber that conducts pulses of light generated by lasers Size and weight reduction Increased speed and carrying capacity McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
31.
31
Telecommunications Media (continued) McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
32.
32
Wireless Technologies Terrestrial Microwave Line-of-sight path between relay stations spaced approximately 30 miles apart. Communications Satellites Geosynchronous orbits Serve as relay stations for communications signals transmitted from earth stations McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
33.
33
Wireless Technologies (continued) Cellular & PCS Systems Each cell is typically from one to several square miles in area. Each cell has its own low-power transmitter or radio relay antenna. Computers & other communications processors coordinate & control the transmissions to/from mobile users as they move from one cell to another McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Wireless Technologies (continued) Wireless LANs Spread spectrum Wi-Fi (wireless fidelity) Wireless Web Uses Web-enabled information appliances Very thin clients McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Telecommunications Processors Modems (modulation/demodulation) Changes signals from analog to digital and back to analog Multiplexers Allows a single communication channel to carry simultaneous data transmissions from many terminals McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Telecommunications Processors (continued) Internetwork Processors Switches Makesconnections between telecomm circuits so a message can reach its intended destination Router Interconnects networks based on different rules or protocols McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Telecommunications Processors (continued) Hub Port switching communications processor Gateway A processor that interconnects networks that use different communications architecture McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Telecommunications Software Provides a variety of communications support services including connecting & disconnecting communications links & establishing communications parameters such as transmission speed, mode, and direction. McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Telecommunications Software (continued) Network Management Traffic management Security Network monitoring Capacity planning McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Network Topologies Star Tiesend user computers to a central computer Considered the least reliable Ring (sometimes called Token Ring) Ties local computer processors together in a ring on a more equal basis. Considered more reliable & less costly McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Network Topologies (continued) Bus Local processors share the same bus, or communications channel Tree is a variation which ties several bus networks together McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Network Topologies (continued) McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Network Architectures & Protocols Protocols Astandard set of rules & procedures for the control of communications in a network Standards for the physical characteristics of cables and connectors Network Architecture Goal is to promote an open, simple, flexible, efficient telecommunications environment McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Network Architectures and Protocols (continued) OSI Model TCP/IP Transmission Control Protocol/Internet Protocol Used by the Internet and all intranets and extranets McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Bandwidth Alternatives Bandwidth is the frequency range of a telecommunications network Determines the channel’s maximum transmission rate Measured in bits per second (bps) or baud Narrow-band Low-speed transmission Broadband High-speed transmission McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Switching Alternatives Circuit switching Packet switching Cell switching McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Discussion Questions The Internet is the driving force behind developments in telecommunications, networks, and other information technologies. Do you agree or disagree? How is the trend toward open systems, connectivity, and interoperability related to business use of the Internet, intranets, and extranets? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Discussion Questions (continued) How will wireless information appliances and services affect the business use of the Internet and the Web? What are some of the business benefits and management challenges of client/server networks? Network computing? Peer-to-peer networks? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Discussion Questions (continued) What is the business value driving so many companies to rapidly install and extend intranets throughout their organizations? What strategic competitive benefits do you see in a company’s use of extranets? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Discussion Questions (continued) Do you think that business use of the Internet, intranets, and extranets has changed what businesspeople expect from information technology in their jobs? Do you believe that the insatiable demand for everything wireless, video, and Web-enabled will be the driving force behind developments in telecommunications, networking, and computing technologies for the foreseeable future? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Real World Case 1 – FedEx versus UPS Why does telecommunications play such a key role in the competition between FedEx and UPS? Why does “information about the package” have such a strategic business value in the express delivery business? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Real World Case 1 (continued) What telecommunications products or services would you recommend that FedEx or UPS use to improve their competitive position in the overnight delivery and shipping business? Consider the different management styles of FedEx and UPS. What makes them work? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Real World Case 1 (continued) What other IT or web-based services could FedEx and UPS offer their business or consumer customers? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Real World Case 2 – Nielsen Media Research Managing bandwidth use Monitoring and enforcing Centralizing operations Testing & tuning applications McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Real World Case 2 (continued) How do the network bandwidth problems experienced by the companies in this case affect their business performance? What network management tactics are used to help solve these problems? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Real World Case 2 (continued) What other network management tactics would you recommend to help solve the business problems identified in this case? What are some network usage problems not mentioned in the case that could be solved by better network management? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Real World Case 3 – Link Staffing, FMC, AutoWeb, & APL Logistics Why do companies implement virtual private networks? What is the business case for outsourcing VPN services? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Real World Case 3 (continued) What role does network management software play in implementing and managing VPNs? What challenges did each company face and how did they use VPNs to help answer those challenges? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Real World Case 4 – Dow Chemical Why have companies been reluctant to rely on Internet telephony instead of traditional telephone systems for business use? Do the potential business benefits support Dow Chemical’s decision to implement a new global VOIP network? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Real World Case 4 (continued) Would you recommend that more companies implement IP telephony services? Why? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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World Case 5 – General Motors Corp. What is the business value of wireless LANs to GM? What are the security vulnerabilities of wireless LANs? Is GM taking appropriate security measures? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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Real World Case 5 (continued) What are some other possible business applications of wireless LANs? What are some of the benefits and challenges of LANs in a small business environment? McGraw-Hill/Irwin Copyright © 2004, The McGraw-Hill Companies, Inc. All rights reserved.
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