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Managing Telecommunications

This chapter explores the transformative journey of telecommunications infrastructure from traditional voice-oriented systems to modern data-centric networks. It discusses the shift from Public Switched Telephone Network (PSTN) built on copper wiring and circuit-switching technology to a new fiber-optic-based model utilizing packet-switching. Addressing the advancements in intelligent user devices and the rise of voice over IP, the chapter outlines the challenges and innovations shaping the telecom industry, including mobile computing, wireless services, and the growing importance of m-commerce.

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Managing Telecommunications

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  1. Managing Telecommunications Chapter 6 Emily Gehm Jessica Paul Melanie Wall

  2. The Evolving Telecommunications Scene A New Telecommunications Infrastructure Is Being Built • “Infrastructure of old” is the telephone network, Public Switched Telephone Network (PSTN) • Built on twisted-pair copper wires and was intended for voice communications • Uses analog technology and circuit switching • Based on “dumb voice telephones”

  3. The Evolving Telecommunications Scene (con’t) • “Infrastructure of New” aimed at transmitting data using fiber optic links sending digital signals • Uses Packet Switching • No circuit created • Each packet can take a different route through the network • Use of more intelligent user devices that provide addressing information • Internet can handle new kinds of intelligent user devices • Global telecom infrastructure is changing from a focus on voice to a focus on data

  4. The Evolving Telecommunications Scene (con’t) • The Telecom Industry Is Being Transformed • Originally provided by monopolies • Becoming like the computing industry • Internet Is the Network of Choice • Extranets • Voice Over IP

  5. Voice Over IP

  6. The OSI Reference Model • Open Systems Interconnection • Created by the ISO • Underlying Framework of Internet • Why Is It Called A Reference Model?

  7. OSI’s Upper Layers 7.Application Layer • Interface to application 6.Presentation Layer • Translates data to and from language in Layer 7 5.Session Layer • Controls dialog, acts as moderator for a session

  8. OSI’s Lower Layers 4.Transport Layer • Controls flows, ensures reliable packet delivery 3.Network Layer • Addresses and routes packets 2.Logical Link Layer • Error correction & data synchronization 1. Physical Layer • Defines physical connection to network

  9. OSI Model Diagram Example

  10. Wireless…The Next Frontier • The Next Big Thing • Mobile Computing • Wireless Computing

  11. Wireless Areas Discussed • Personal Area Networks (PANs): To connect a laptop computer to a cell phone • LANs: In an office building or warehouse as a wireless LAN • WLL: To handle “the last mile” • Long Distance: To provide voice services to mobile people via their cell phones • M-commerce: To transact business wirelessly via PDAs, smart phones, or other information appliances communicating through the Internet.

  12. Wireless PANs • Personal Area Network • Main Technologies: infrared and Bluetooth

  13. Wireless LANs • Local Area Network • Two Technologies: infrared and microwave • Two Topologies: peer to peer and client server

  14. Wireless Local Loops • The Goal • “Fixed Wireless” • “Last Mile Problem”

  15. Wireless Long Distance • Only two wireless technologies in the microwave range • Cell Phones • GSM (Global System for Mobile Communications) • TDMA (Time Division Multiple Access) • CDMA (Code Division Multiple Access) • CDPD (Cellular Digital Packet Data) • SMS (Short Messaging Services)

  16. M-Commerce • Mobile Commerce • The Vision • Ways to Send E-mail

  17. Is Wireless Safe? • Damage To DNA!! • (EMR) Electro-magnetic radiation • Spikes=dead cells

  18. Role of the IS Department • Interoperability • Connectivity • Operate the Network • Many companies outsource • Stay Current with Technology • Continually “peering” into the future

  19. The End

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