A data communication system has five components:
1. Message: the message is the information (data) to be communicated.
2. Sender: The sender is the device that data message. It can be a computer, cell phone, camera and so on.
3. Receiver: the receiver is the device that receives the message. It can be a computer, cell phone, television and so on.
4. Transmission medium: the Transmission medium is the physical path by which a message travels from sender to receiver. Example twisted-pair wire, coaxial cable, fiber-optic cable, radio waves …
5. Protocol: a protocol is a set of rules govern data communications.
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