1. Telecommunication and Networks
Chapter 5
Telecommunication and Networks

2. Telecommunication Principles and Applications
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
Possible Values
Distance
Face-to-face
Building or campus
Metropolitan area
Wide area
Organizational Context
Organizational members only
Organizational members and partners
Public
Human/Computer Context
Human/Human
Human/Computer (Input/Output)
Computer/Computer
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 Domain Name
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. Ensuring Telecommunication 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. Ensuring Telecommunication Security
Figure 5-9 Public Key Cryptography
Chapter 5

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

27. Ensuring Telecommunication 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. Telecommunication and Networks
End of
Chapter 5
Telecommunication and Networks