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?