Data may be transferred from one device to another by means of some communication media. The electromagnetic or light waves that transfer data from, one device to another device in encoded form are called signals. Data transmissions across the network can occur in two forms i.e. 1. Analog Signal & 2. Digital Signal.
The transfer of data in the form of electrical signals or continuous waves is called analog signal or analog data transmission. An analog signal is measured in volts and its frequency in hertz (Hz).
Advantages of Analog Signal:
a. It allows for multiple transmission across the cable.
b. Suffers less from attenuation.
Disadvantages of Analog Signal:
a. Suffers from EMI. Electromagnetic interference ( or EMI, also called radio-frequency interference or RFI) is a disturbance which affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source.
b. Can only be transmitted in one direction without sophisticated equipment.
The transfer of data in the form of digit is called digital signal or digital data transmission. Digital signals consist of binary digits 0 & 1. Electrical pulses are used to represent binary digits. Data transmission between computers is in the form of digital signals.
Advantages of Digital Signal:
a. Equipment is cheaper and simpler than analog equipment.
b. Signals can be transmitted on a cable bidirectional.
c. Digital signals suffer less from EMI.
Disadvantages of Digital Signal:
a. Only one signal can be sent at a time.
b. Digital Signals suffer from attenuation.
What is Data Communication?
Data Communication refers to the electronic transfer of information between computers. Data Communication have become a major focus of the computer industry. It is the transmission of electronic data over some media. The media may be cables, microwaves. The four basic elements are needed for any communication system.
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