Introduction to Data Communications

Definition of Data Communications

• Sharing of information between two parties.
• Can be local or remote.

Key Terms

• Telecommunication:
  • "Tele" means far (from Greek).
  • Refers to remote sharing of information (e.g., telephony, telegraphy, video broadcast like television).

Forms of Data

• Data can take multiple forms:
  • Text
  • Audio
  • Video

Simple Communication Model

Components of the Model

1. Source:

   • Originator of the information.
   • Can be a machine, system, or workstation that produces the data.

2. Transmitter:

   • Converts originated data into a transmittable form.
   • Works in conjunction with the source to form a source system.

3. Transmission System/Medium:

   • Connects the source system to the destination system.
   • Examples:
     • Public telephone network.
     • Mobile network (3G, 4G).
     • Wired (copper wire) or wireless.

4. Receiver:

   • Receives information from the transmission medium.
   • Converts data into a format understood by the destination.

5. Destination:

   • Ultimate point where data is sent.

Example of Communication Model

• Workstation to Server Example:
  • Workstation (e.g., laptop) produces data (e.g., an email).
  • Modem converts data for transmission over a network.
  • On the receiving end, the modem converts the data back for the server to understand.

Conclusion

• Overall, the communication model provides a simplified view of how data is communicated between systems.
• It encompasses complexities and details within each component.