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Managing Telecommunications

Managing Telecommunications. Chapter 6 Emily Gehm Jessica Paul Melanie Wall. The Evolving Telecommunications Scene. A New Telecommunications Infrastructure Is Being Built “Infrastructure of old” is the telephone network, Public Switched Telephone Network (PSTN)

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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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