Data Communication is the exchange of data between two devices using some form of transmission media.
The Transmission of data is done between a centralized computer and remote terminals or between two or more computer centres over established communication links.
Data is transferred from one place to another in the form of signals
There are three types of signals as follows:
- Digital Signal – In digital signal, data is transmitted in the electronic form of data, i.e. binary digits ( 0 or 1)
- Analog Signal –In analog signal, data is transmitted in the form of radio waves like in telephone line.
- Hybrid Signal – Hybrid signals have properties of both analog signal and digital signal.
The communication channel refers to the directions of signal flow between two linked devices. There are mainly tree types of transmission of data as follows :
In this channel, the flow of data is always in one direction, with no capability to support response in other direction. This communication is unidirectional. Only one of the communicating devices transmits information and the other can only receive.
Example Like – Radio, Television, Keyboard etc.
Half Duplex Channel
In this channel, the data can flow in both directions, but not at a same time. When one device transmits information, then other can only receive at that point of time.
Example Like – Walkie-Talkie
Full Duplex Channel
In this channel, the flow of data is in both directions at a time, i.e both stations can transmit and receive information simultaneously.
Example – Wireless Handset (Mobile Phone)
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