Sunday, November 21, 2010

Data and Computer Communication

A Communications Model

  • Source 
    • generates data to be transmitted 
  • Transmitter 
    • Converts data into transmittable signals 
  • Transmission System 
    • Carries data 
  • Receiver 
    • Converts received signal into data 
  • Destination 
    • Takes incoming data

Simplified Communications Model - Diagram



Key Communications Tasks

  • Transmission System Utilization 
  • Interfacing 
  • Signal Generation 
  • Synchronization 
  • Exchange Management 
  • Error detection and correction 
  • Addressing and routing 
  • Recovery 
  • Message formatting 
  • Security 
  • Network Management

Simplified Data Communications Model

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