Which one is better between analogue and digital signal can be measured by three factors. These are:
- the qualitative standard of the sipial,
- the elements to maintain the process and
- cost or expense.
Digital signal is the best to send a signal to a long distance. If the distance is long, the power of analogue signal decreases gradually. Then to sustain the analogue signal, amplification has to be done. As a result noise increases, and the quality of the signal is reduced or distorted and it can be fully lost.
But the digital signal is amplified on the way. As a result the signal remains unchanged. Digital signal is used to transmit a signal through an optical fiber, since the qualitative standard of the last signal remains unchanged. Besides many signal can be sent in every second. Though the digital device is more expensive than the analogue device, the total cost is less in digital system than that of the analogue system. Cross connection may be occurred in analogue device but it cannot be happened in digital system.
A thorough understanding of analog and digital technologies is developed through analysis of the advantages and disadvantages of each. The technologies are used throughout the world and the infrastructure varies, so a varied approach to applying the technology, will depend on that infrastructure and the standards that apply to the region for which the systems are being installed.