Data communication is little bit different field compared to telecommunication. Tele is a Greek word, means far and communication means exchange of words. So telecommunication means exchange of words between two parties far apart.
There is slight difference between telecommunication and data communication. So there is no need to be confused between the concepts of these two words. Data communication is a subset of telecommunication. The information that are transferring or exchanging between two devices mainly consists of binary data or digital data.“Data communication is the exchange of information from one entity to the other using a transmission medium”. As you can clearly notice, this definition leaves many questions in our mind.
There are number of factors that need to be elaborated. In this definition we will explain “exchange of information” in detail. What is meant of exchange of information in this definition, whether the exchange should be in one direction or both the parties should be allowed to exchange with each other.
The second word is information; information can be of many different types. Information can be text, alpha-numeric character, and photograph, so it can be explained in detail what type of information we use in data communication.
The third word, we use here is entity. The fourth word, we mention here is transmission medium. How should be the transmission medium, what are the specific things about transmission medium?We look back to the history of data communication, how data communication evolved. Data communication is a mixture of blend of history. So here we will discuss the history of telecommunication, history of data communication and history of internet.
The history of data communication dated back to 1837 with the invention of telegraph by Samuel Morse. Telegraph was the first entity used as a source of communication. The second invention was telephone system in 1876 by Alexander Graham Bell. Telephone was second huge step in today busy telecommunication world. By 1950’s, telegraph and telephone companies had already developed a network of communication facilities throughout this industrialized world. By 1970’s, we had all the invention of databases, languages, operating systems, hardware and software. The merger of computer science field and data communication field took place in 1970. That was the time when we people started thinking about the transferring of data. The merger of these two fields was initiated and stimulated by three developments.
The first development was the integration of large scale of electronic components, the components not only reduced in size but also became cheap, and this actually initiated the availability of terminals, communication equipments.
The second development was the evolution of new software. The new software became available which initiated the development of data communication network. The third development was the competition of companies, due to the availability of hardware, software.Today in ever changing and busy world the role of data communication is even more important than ever. Today we are in need of better, secure and fast way of communication. Gone was a day when we used to wait for a couple of week to receive a letter. New we receive same letter from anywhere in a split of second. Now we require three aspect of data communication in today busy world, speed, accuracy and security.