What is Data Communication? fully information..
Data communication is the transfer of digital or analog data between two or more centers, which are connected to each other through a communication channel.
Data communication has the following benefits:
- Saving time spent physically sending data and preparing data.
- Full use of processing power and storage capacity of modern computers.
- Fast receipt of information from file.
- Prevention and Accuracy of Copying Files
- Low cost data exchange.
There are mainly three types of communication channels:
In this the flow of data is always in one direction. For example, the radio signal from the radio station reaches the listener, but the listener cannot transfer them back to the radio station. The signal goes in the same direction ie ‘A’ to ‘B’.
Half Duplex Channel:
In this channel, data flows in both directions. But at one time, data flows in one direction, ie from ‘A’ to ‘B’ or ‘B’ to ‘A’. Such as a telephone line.
Full Duplex Channel:
The flow of data in this channel can occur simultaneously in both directions. At the same time, data can be moved from ‘A’ to ‘B’ and from ‘B’ to ‘A’.
The flow of data from a computer to a terminal or a terminal to a computer requires a medium called a communication line or data link.
They are of the following types:
- Coaxial Cable
- Optical Fiber
- Microwave Transmission
- Standard Telephone
- Satellite communication