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?
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