DATA COMMUNICATION

The exchange of data between two devices via some form of transmission medium such as wire cable etc.

TELE COMMUNICATION

Tele is a Greek word for “Far”, so the Communication at a distance is known as Tele communication.

It includes telephony, telegraphy and television.

Types of communication:

Communication between two devices can be simplex, half duplex and full duplex.

SIMPLEX:

The communication is unidirectional (One way communication).

In this type only one of the two devices on a link can transmit, the other can only receive.

Keyboard is an example, as it can only input the data.

Radio, TV are also example of Simplex Mode.

HALF DUPLEX:

Two way communication but one at a time.

In this type of communication when one device is sending the other can only receive and vice versa.

Walkie- talkies are example of Half Duplex.

FULL DUPLEX:

Two way communication simultaneously.

In this type of communication devices can send and receive the data at the same time.

Telephone is one common example of full duplex.