Theory of Signal Transmission (TST) is the science of signal transmission in time and space through technical systems. The study course is intended to deepen knowledge of signal discretization and approximation issues, linear systems theory, based on the theory of whole analytical functions, as well as other theoretical issues of communication techniques. The theory of integer analytic functions is a valuable tool in communication theory and practice because integer analytic functions in the complex plane on the real axis correspond to functions with a limited spectrum. These are the functions that correspond to signals that are transmitted over a limited frequency band. TST is also a cyber industry. The mathematical basis of TST is Fourier analysis, probability theory, random process theory, and mathematical set theory. TST consists of three parts - signal theory, interference immunity theory, and information theory, which also contains quantum informatics and quantum transmission.