Data Communication, Transmission Modes

Communication
Communication means sending and receiving information between two or more persons.

Telecommunication
Telecommunication is a system of transmission of sounds, images, texts or data in the form of electronic signals.

Data communication

A data communication system is the collection of hardware, software and other devices that allows to exchange data, information and voice between two or more devices through a wire or radio waves.

The components of data communication are data, sender, medium, receiver and protocol.

Any two examples of data communication are e-mail and chat

Data transmission mode

Data transmission mode is the way of transmitting data from one device to another.

The modes of data transmission are simplex mode, half duplex mode, full duplex mode

Simplex mode

The mode of transmission where transmission can take place in only one direction is called simplex mode.

Examples of simplex mode are TV Broadcasting, Radio transmission and Newspaper.

Half-duplex mode

The mode of transmission where data can be transmitted to both directions, but only to one direction at a time is called half-duplex mode.

Examples of half-duplex mode are Wireless handset and Walky-talky

Full-duplex mode

The mode of transmission which allows simultaneous transmission of data to both directions is called full-duplex mode.
Example of full-duplex mode is telephone

Bandwidth
Bandwidth can be defined as the maximum volume of data that can be transmitted through the communication medium.

We can measure bandwidth in digital devices by bits per second and in analogue devices by cycles per second or Hertz (Hz).