PCM Full Form is Pulse Code Modulation which is a technique to convert signal analog to digital in digital communication. PCM is one of the most preferable noise-resistant transmission methods. For transmission, PCM require high transmitter bandwidth. Pulse code modulation has an important advantage which is that the message in PCM is a train of pulses of equal height, means it can be regenerated almost perfectly any number of times along the propagation path because the data is not dependent on the precise height and shape of the pulses. This type of modulation generally used in both the telephone network, public and private.