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Communication and Information Systems

A telecommunications system exists to transmit information. It consists of five essential elements:

  1. Computers for processing data
  2. Terminals or other input/output devices (Micro computers often act as terminals and sensors may be appropriate in some applications)
  3. Communication channels which link sender and receiver. The communication channel may be:
  4. Wire for signals carried electrically
  5. Fibre optic for signals carried optically
  6. Satellite (direct or via booster station) for signals carried by radio
  7. Communications hardware - such as modems and multiplexors which are responsible for supporting the data transmission
  8. Communications software to control the movement of data through the network.

A communication network may be a wide area network (WAN) or a local area network (LAN) or a mixture of both. Some networks are public in which case anyone can use them - usually for a fee or it may be private as would be the case with a company WAN linking branch offices with a central computer.
   

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