1. Chapter 4 Data Communication Applications

2. Agenda Application Category Evolution Applications Internet, Intranet, & Extranet Considerations

3. Application Category Human-machine interaction –Person-to-person –Person-to-machine or machine-to-person –Machine-to-machine Type of information –Voice or data –Structured or unstructured –Static image or dynamic image Timeliness –On-line –Real-time –Store-and forward –Batch

4. Evolution Telegraph Administrative message switching Computers

5. Telegraph Morse Code Dots and dashes Slow No error correction

6. Message Switching Systems Equipment: teletypewriters Types: torn tape message system –Point-to-point –Multipoint line –Collision, polling, address, and protocol –Control or master station and subordinate or slave station

7. Computers Benefits –Inquiry –File updating –Timesharing –Other applications (TPS, MIS, DSS, EX, EC) Types –Centralized –Distributed –Client-server

8. Applications - I Airline reservation system –American airline: Sabre system –United airline: Apollo reservation system Automatic teller machine –Swift: Society for Worldwide Interbank Financial Telecommunication Sales order entry –Point of sale –Universal product code

9. Applications - II Unstructured data application –Electronic mail –Ownership of content –Simple mail transfer protocol (SMTP) No foreign characters No executable files Limited size –Multipurpose Internet mail extensions (MIME)

10. Applications - III Image application –Facsimile (FAX) Simple for printed documentation –Television Purpose –Security –Information –Conference Types –Freeze-frame & full-motion –One-way & two-way

11. Internet, Intranet, Extranet Internet –Browser program Netscape’s Navigator Microsoft’s Internet Explorer –Uniform Resource Locator (URL) –World Wide Web (WWW) –Hypertext transfer protocol (http) –Internet service provider (ISP): tier 1, tier 2, tier 3 Intranet Extranet

12. Consideration Response time –User expectation –consistency Security Planning for failures –Do nothing –Manual system –Back up computer & lines –Hot standby system Disaster Recovery –Mutual aid pact –Commercial service: Comdisco Disaster Recovery Services –Planning & testing regularly

13. Points to Remember Application Category Evolution Applications Internet, Intranet, & Extranet Considerations

14. Discussion What are the telecommunication systems design considerations for a bank?