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1. 1 TelecommunicationsandNetworks
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.
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.
4. 4 Section I The Networked Enterprise
5. 5 Networking the Enterprise Networking business and employees
Connecting them to customers, suppliers, and other stakeholders.
6. 6 Trends in Telecommunications
7. 7 Trends in Telecommunications (continued) Industry
More options for the firm
Easy access for end users
Use common standards for hardware, software, applications, & networking.
8. 8 Trends in Telecommunications (continued) Technology (continued)
High degree of interoperability
Higher transmission speeds
Moves larger amounts of information
Lower error rates
Multiple types of communications on the same circuits
9. 9 Technology (continued)
Fiber-optic lines & cellular, PCS, satellite & other wireless technologies
Faster transmission speeds
10. 10 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
11. 11 Business Value of TelecommunicationsNetworks
13. 13 The Internet (continued) The business value of the Internet
14. 14 Intranets Within an organization
Uses Internet technologies
Business value of Intranets
Used for information sharing, communication, collaboration, & support of business processes.
Comparatively easy, attractive, & lower cost alternative for publishing & accessing multimedia business information
15. 15 Intranets (continued) Business Operations & Management
Used for developing & deploying critical business applications
Supports operations and managerial decision making
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
17. 17 Extranets (continued) Business value
Improve communication with customers and business partners
Gain competitive advantage in
Leveraging their partnerships
18. 18 Section II Telecommunications Network Alternatives
19. 19 Telecommunications Network Alternatives
20. 20 A Telecommunications Network Model
21. 21 A Telecommunications Network Model (continued) Consists of five basic components
Any input/output device that uses telecommunication networks to transmit or receive data
Support data transmission and reception between terminals and computers
22. 22 Telecommunications channels
The medium over which data are transmitted and received
Interconnected by telecommunications networks
Telecommunications control software
Control telecommunications activities & manage the functions of telecommunications networks
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
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
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
28. 28 Types of Telecommunications Networks (continued) Network computing
“the network is the computer”
Thin clients process small application programs called “applets.”
29. 29 Peer-to-Peer (P2P)
Two major models
Central server architecture
30. 30 Telecommunications Media Twisted-pair wire
Minimizes interference and distortion
Allows high-speed data transmission
Glass fiber that conducts pulses of light generated by lasers
Size and weight reduction
Increased speed and carrying capacity
31. 31 Telecommunications Media (continued)
32. 32 Wireless Technologies Terrestrial Microwave
Line-of-sight path between relay stations spaced approximately 30 miles apart.
Serve as relay stations for communications signals transmitted from earth stations
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
34. 34 Wireless LANs
Wi-Fi (wireless fidelity)
Uses Web-enabled information appliances
Very thin clients
35. 35 Telecommunications Processors Modems (modulation/demodulation)
Changes signals from analog to digital and back to analog
Allows a single communication channel to carry simultaneous data transmissions from many terminals
36. 36 Telecommunications Processors (continued) Internetwork Processors
Makes connections between telecomm circuits so a message can reach its intended destination
Interconnects networks based on different rules or protocols
37. 37 Hub
Port switching communications processor
A processor that interconnects networks that use different communications architecture
38. 38 Telecommunications Software Provides a variety of communications support services including connecting & disconnecting communications links & establishing communications parameters such as transmission speed, mode, and direction.
39. 39 Telecommunications Software (continued) Network Management
40. 40 Network Topologies Star
Ties end 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
41. 41 Network Topologies (continued) Bus
Local processors share the same bus, or communications channel
Tree is a variation which ties several bus networks together
43. 43 Network Architectures & Protocols Protocols
A standard set of rules & procedures for the control of communications in a network
Standards for the physical characteristics of cables and connectors
Goal is to promote an open, simple, flexible, efficient telecommunications environment
44. 44 Network Architectures and Protocols (continued) OSI Model
Transmission Control Protocol/Internet Protocol
Used by the Internet and all intranets and extranets
45. 45 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
46. 46 Switching Alternatives Circuit switching
47. 47 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?
48. 48 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?
49. 49 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?
50. 50 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?
51. 51 References James A. O'Brien; George M. Marakas. Management Information Systems: Managing Information Technology in the Business Enterprise 6th Ed., Boston: McGraw-Hill/ Irwin,2004