first lecture is about the Data and Data Communication and concepts. Which are very useful for students.So lets start with the concept of data and data communication and its history, so lets start with defininition of data communication.

DEFINITION OF DATA COMMUNICATION
“Data Communication is the exchange of Information from one entity to the other using a Transmission Medium”.

As you can clearly notice, the definition of Data Communication although Simple leaves many questions unanswered:
􀂾 Exchange??????
􀂾 Information?????
􀂾 Entities???????
􀂾 Transmission????
􀂾 Medium????

We will try to answer all these Questions in this Course

History of Data Communication
Data communications history represents a blend of histories, including:
􀂾 The history of the telecommunications industry
􀂾 The history of data communications, and
􀂾 The history of the Internet

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Telegraph 1837 Samuel Morse
Modern telecommunication industry began in 1837 with the invention of the telegraph by Samuel Morse This led to building a telecommunications infrastructure of poles and wires as well as to the development of communication hardware and protocols
Telephone 1876 Alexander Graham Bell
Invention of telephone by Alexander Graham Bell in 1876 and the development of wireless communication technology by Guglielmo Marconi in the 1890s set the stage for today’s communication industry
By 1950’s
By 1950s, telephone and telegraph companies had developed a network of communication facilities throughout the industrialized world
1970’S
Although development of databases, languages, operating systems, and hardware was strong from 1950s to 1970s, large-scale data communication systems did not emerge until the 1970s.
This was stimulated by 3 major developments:
􀂾 Large-scale integration of circuits reduced cost and size of terminals and communication equipment
􀂾 New software systems that facilitated the development of data communication networks
􀂾 Competition among providers of transmission facilities reduced the cost of data circuits