Datacommunication

5
Data Communication and
Networking
5.1 Introduction
Today information processing system is available in many offices and homes and therefore there is a
need to share selective information and programs among various computers. With the advancement
of data dialogue facilities the confabulation between computers has
change magnitude and thus it has extended the power of computer beyond the computer
room. instantaneously a wasting diseaser sitting at single can can communicate with computers of any
remote site through talk channel. The aim of this lesson is to
introduce you the various aspects of computer network.
5.2 Objectives
After divergence through this lesson, you will be in a coiffe to
l learn the basic elements of data communication system
l describe communication protocols and data transmission modes
l explicate the use of computer network
l describe different components of computer network
l identify different types of network
l understand what is net and e-mail and its uses in modern
communication
l appreciate the use of air communication
5.3 Data Communication
We all are acquainted with some sorts of communication in our day to day life.
For communication of information and messages we use telephone and postal
communication systems.



Similarly data and information from one computer
system can be transmitted to other systems crossways geographical areas. then data
transmission is the movement of information development some standard methods.
These methods include electrical signals carried along a conductor, optical
signals along an optical fibers and electromagnetic areas.
Suppose a director has to write several letters to various clients. First he has to
use his PC and Word Processing package to make water the letter, if the PC is
connected to all the clients PC through networking, he can send the letters to
all the clients within minutes. Thus irrespective of geographical areas, if PCs
are connected through communication channel, the data and information,
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