“Transferring of data from one point to other is called data communication”.
BASIC ELEMENTS OF DATA COMMUNICATION:
Three basic elements are
1) Transmitter or Sender:
Who sends data called a Sender.
Which carries information called a Medium. Such as cables, air (etc)
Which receives the information, called a Receiver.
DATA COMMUNICATION MODES:
There are three modes of data communication
1) Simplex Mode:
Data can send only in one direction/side (from sender to
Radio, Television (etc)
2) Half-Duplex Mode:
Data can send both directions/sides but only in one direction/side at a time (from sender to receiver or from receiver to sender).
Wireless set, Computers in a Network (etc)
3) Full-Duplex Mode:
Data can send both directions/sides at a time (from sender to receiver and from receiver to sender).
Examples: Telephone Lines (etc)
TYPES OF DATA:
There are two types of data are
1) Digital Signals:
- Computer use digital signals.
- Data in the form of “0” and “1”.
- Discrete data.
- Examples: Data stored in memory (etc)
2) Analog Signals:
- Telephone lines use digital signals.
- Data in the form waves.
- Continue data.
- Examples: Human Voice (etc)