Introduction to data communications
- 2. What is data communication? Not to be confused with telecommunication— – Any process that permits the passage from a sender to one or more receivers of information of any nature, delivered in any easy to use form by any electromagnetic system. Data communication– Defined as a subset of telecommunication involving the transmission of data to and from computers and components of computer systems. • More specifically data communication is transmitted via mediums such as wires, coaxial cables, fiber optics, or radiated electromagnetic waves such as broadcast radio, infrared light, microwaves, and satellites.
- 3. History of Telecommunications Invention of telegraph Samuel Morse – 1837 Invention of telephone- Alexander Graham Bell – 1876 Development of wireless By ??? – 1896 Concept of universal access and growth of AT&T Divestiture of AT&T—what year??
- 4. History of Telecommunications Continued…. Telecommunications Act of 1996 Three main developments that led to the growth of data communications systems: – Large-scale integration of circuits reduced the cost and size of terminals and comm equipment – Developments of software systems made establishment of communication networks easy – Competition among providers of transmission facilities reduced the cost of data circuits
- 5. History of Data Communication Transistor developed by Bell Labs (which is now ???) 1947 Hush-a-Phone Case Carterphone case MCI and Long Distance Creation of networks (LAN’s and WAN’s) Data Link Protocols Microcomputers
- 6. History of the Internet See web page link– http://carl.sandiego.edu/itmg360/internet_history.htm
- 7. Framework for Global Electronic Commerce A Framework for Global Electronic Commerce was released in 1997 It’s release underscores the importance of Internet-based commerce in the global economy It outlines several guiding principles for e-commerce planners and strategists
- 8. Table 1-3
- 9. Table 1-4
- 10. Features of Communication Four things required – Sender, receiver, medium, and message Types of messages – – – – – – File Request Response Status Control Correspondence Understandability Error Detection
- 12. Network Applications The network applications environment consists of several important components: – Application programs – Operating systems – Data communication systems – Database management systems The application environment is illustrated in Figure 1-10
- 13. Figure 1-10
- 14. Online System Requirements Response Time Throughput Consistency Flexibility
- 15. Online Systems Requirements Continued Availability Reliability – Mean time between failure (MTBF) – Mean time to repair (MTTR) – Fault Tolerance Recovery Security
- 16. Business Data Communication Applications Major data communication applications include: – E-mail – Groupware – Knowledge management systems – E-commerce and e-business applications – Wireless applications
- 17. Groupware Applications Group calendar systems Electronic filing cabinets Project management software Group support systems Electronic meeting and videoconferencing systems Document management systems (image processing systems)
- 18. Other Data Communication Applications Batch applications Data entry applications Distributed applications Inquiry/response applications Interactive applications Sensor-based applications Combined applications
- 19. Application Service Providers Many businesses have turned to third-party services for some or all of their business and data communications applications Application service providers (ASPs) are third-party organizations that manage and distribute software and services to other companies over the Web Many ASPs specialize in integrated ecommerce and e-business applications
- 20. Business Data Communications Issues Major data communications issues include: – Cost-effectiveness – The Internet – Bandwidth – Evolving technologies – Convergence – Standards – Privacy and security
- 22. Business Data Communication Careers There are numerous job opportunities and career paths for individuals interested in data communications and networking Table 1-6 includes examples of data communication job titles Table 1-7 summarizes some of the major professional certifications for networking and data communications specialists
- 23. Table 1-6
- 24. Table 1-7