History of Communication system

In the communication fields, the history starts with the   Samuel Morse’s telegraph communication. It gave the revaluation in the communication field.  He transmitted  the “What hath God wrought,”  word in electric telegraph between Washington, D.C., and Baltimore, Maryland, in 1844, a completely revolutionary means of real-time, long-distance communications was triggered. It was formulated by manual form in variable length code. Specifically, the Morse code is a variable-length code using an alphabet of four symbols: a dot, a dash, a letter space, and a word space; short sequences represent frequent letters, whereas long sequences represent infrequent letters.

more about  click the below link 

Communication System - Introduction- look at communication in history