COMPUTER NETWORKING

Detailed explanation-1: -PCM is the standard method used in PSTN (Public Switched Telephone Network) to convert analog data into digital data and with PCM it is easy to combine digitized voice and digital data into a single, high speed digital signal and propagate it over a metallic and optical fiber cable.

Detailed explanation-2: -Pulse code modulation (PCM) is a form of digital-to-analog conversion in which the information contained in the samples of an analog signal can be represented or shown in the form of digital words in a serial bit stream of words.

Detailed explanation-3: -An analog signal is a continuous wave, and the PCM signal is a wave with a series of digits. Thus, we can define PCM as the modulation method that transmits the pulses in the form of binary digits representing a code number.