dc

Easy to manipulate
Flexible
Compatibility with other digital systems
Only digitized information can be transported through a noisy channel without degradation
Integrated networks
Disadvantages of Digital -
Sampling Error
Digital communications require greater bandwidth than analogue to transmit the same
information.
The detection of digital signals requires the communications system to be synchronized,
whereas generally speaking this is not the case with analogue systems.
Some more explanation of advantages and disadvantages of analog vs digital
communication.
1.The first advantage of digital communication against analog is it’s noise immunity. In any
transmission path some unwanted voltage or noise is always present which cannot be
eliminated fully. When signal is transmitted this noise gets added to the original signal
causing the distortion of the signal. However in a digital communication at the receiving end
this additive noise can be eliminated to great extent easily resulting in better recovery of
actual signal. In case of analog communication it’s difficult to remove the noise once added
to the signal.
2.Security is another priority of messaging services in modern days. Digital communication
provides better security to messages than the analog communication. It can be achieved
through various coding techniques available in digital communication.
3. In a digital communication the signal is digitized to a stream of 0s and 1s. So at the
receiver side a simple decision has to me made whether received signal is a 0 or a
1.Accordingly the receiver circuit becomes simpler as compared to the analog receiver
circuit.
4. Signal when travelling through it’s transmission path gets faded gradually. So on it’s path
it needs to be reconstructed to it’s actual form and re-transmitted many times. For that reason
AMPLIFIERS are used for analog communication and REPEATERS are used in digital
communication. Amplifiers are needed every 2 to 3 Kms apart where as repeaters are needed
every 5 to 6 Kms apart. So definitely digital communication is cheaper. Amplifiers also often
add non-linearity that distort the actual signal.