The phenomena of transmitting information which includes a formalized form by symbols or Analog signals is predominantly known as Data transmission or Data communications which deals with the branch of telecommunications; the information either is intended for machine processing (for example, by computers) or has already undergone machine processing. The term “data transmission” is also applied to the actual process of transmitting the information. Such information is called data. Data transmission frequently requires greater reliability, rate, and accuracy of transmission because of the greater importance of the information being transmitted and the impossibility of logical monitoring by human beings during the transmitting and receiving processes. Together with computer technology, data transmission serves as the technical base for information and computing systems, including automatic control systems of various levels of complexity. The use of data transmission facilities speeds up the collection and dissemination of information and permits subscribers with inexpensive terminal equipment to enjoy the services of large computer centres.
