Telecommunication and Networks

1. Chapter 5 Telecommunication and Networks

2. Telecommunication Principles and Applications • Communication • The exchange of information between two parties • Telecommunication • Communication at a distance Chapter 5

3. Telecommunication Principles and Applications • Dimensions of Telecommunication • Distance significantly affects options for communication • Organizational context establishes the nature of the relationships between the communicating parties Chapter 5

4. Dimensions of Telecommunication Chapter 5

5. Telecommunication Principles and Applications • Telecommunication Process • Sender initiates message communication • Device puts sender’s message onto a telecommunication medium • Telecommunication medium transfers message to receiver’s location Chapter 5

6. Telecommunication Principles and Applications • Telecommunication Process • Device takes message off the communication medium • Recipient receives the message Chapter 5

7. Telecommunication Principles and Applications • Types of Business Applications • Coordination of business activities • Group decision making • Electronic commerce Chapter 5

8. Telecommunication Infrastructure • Communication Carriers • Telephone Carriers • Local Exchange Carriers (LECs) • Long Distance Carriers • Cellular Services • Cable Providers • Value Added Networks (VANs) • Resells transmission capacity with additional services Chapter 5

9. Telecommunication Infrastructure • International Issues • Monopoly government providers in many countries • Decreasing regulation worldwide • Cross-border data flow regulations • Differences in privacy rules Chapter 5

10. Telecommunication Technology • Standards • Characteristics of telecommunications media, hardware, and software • Open Systems Interconnection (OSI) Model • Provides a framework for thinking about communication standards Chapter 5

11. Telecommunication Technology • The Computer/Medium Interface • Modem • Converts digital computer output to signal needed for transmission and vice versa • Adaptor/NIC • Interface between computer and a network Chapter 5

12. Telecommunication Technology • Transmission Media • Twisted pair wire • Coaxial cable • Fiber optic cable • Microwave signals • Infrared signals • Radio signals Chapter 5

13. Telecommunication Technology • Switching and Routing Technologies • Devices • Hub • Switch • Router • Gateway • Protocol • Standard for how a message is packaged, secured, sent routed, received, and acknowledged by the receiver within a network Chapter 5

14. Telecommunication Technology • LAN Protocols • Ethernet • Token ring • Wi-Fi • Bluetooth Chapter 5

15. Telecommunication Technology Figure 5-9 Chapter 5

16. Telecommunication Technology • WAN Services • Leased lines • Switched circuit data services • Packet switched services • Cellular services Chapter 5

17. Internet Concepts • Who Manages The Internet? • Companies, individuals, and governments own pieces of the Internet, but the Internet as a whole has no owners or operators Chapter 5

18. Internet Concepts • Network Addressing • IP Number • Consists of two parts—a network number and a device number • Domain Name • Translated to IP number by Domain Name Servers (DNSs) Chapter 5

19. Network Management • Simple Network Management Protocol • Defines how network devices maintain and communicate information about their own activity and performance Chapter 5

20. Network Management • Network Analyzer • Plugs into a network and analyzes the traffic that passes by or through it Chapter 5

21. Network Management • Network Management Software • Device management • Recognizes the devices, including computers and printers, that are connected to the network • Security services • Provide entry into the network and establish a relationship between a user and a client station Chapter 5

22. Network Management • Network Management Software • File services • Provide access to shared files • Print services • Provide central access to a common printer • Fax services • Allow network users to send or receive a facsimile electronically Chapter 5

23. Network Management • Network Management Software • Directory services • Provide an enterprise-wide telephone book that identifies and connects network users to each other and to software Chapter 5

24. EnsuringTelecommunication Security • Key: A secret code that can scramble or unscramble a message • Public Key Cryptography • Uses a pair of keys • Message scrambled by one key can only be unscrambled by the other Chapter 5

25. EnsuringTelecommunication Security Figure 5-9 Public Key Cryptography Chapter 5

26. EnsuringTelecommunication Security • Public key cryptography ensures • Security • Non-repudiation • Authentication • Requires certificate authority • Non-repudiation • Via digital signature • Integrity Chapter 5

27. EnsuringTelecommunication Security • Firewall • Hardware and/or software intended to separate an organization’s intranet, and the data on it, from its extranet and the Internet • Virtual Private Network (VPN) • Simulates a private network by using a public network, such as Internet, and security protocols Chapter 5

28. End of Chapter 5 Telecommunication and Networks