Chapter 4 Data Communication Applications

Chapter 4 Data Communication Applications

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

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

Evolution Telegraph Administrative message switching Computers

Telegraph Morse Code Dots and dashes Slow No error correction

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

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

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

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)

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

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

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

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

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