What do you mean by data communication? What are its components?


It is the exchange of data between two devices through some transmission medium.
Types:
1.     Local
2.     Remote
1. Local:
If the devices are restricted in a geographical area.
2. Remote:
If the devices are farther away without any geographical restriction.
Fundamental Characteristics:
1.     Delivery
2.     Accuracy
3.     Timeliness
Components:
Data communication systems are made up of five components.
1.     Message
2.     sender
3.     Receiver
4.     Medium
5.     Protocol
 
Components of data Communication

1. Message:
This is the information to be communicated. It can consist of text, numbers, pictures, sound or video or any combination of these.

2. Sender:
It is the device that sends the data message. It may be a computer, workstation, telephone handset, video camera…
3. Receiver:
It is the device that receives the message. It may be a computer, workstation, telephone handset, television…
4. Medium:
It is the physical path which a message travels from sender to receiver. It may consist of twisted pair wire, coaxial cable, fiber optic cable, laser or radio waves.
5. Protocol:
            It is a set of rules that governs data communication. It is a agreement between the communication devices.

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