Students, in this lecture, we will talk a little bit about the very basic, very introduction part of the data communications. What is data communications? Students, we will start with communication. Communication is the sharing of information between two parties. This information sharing, it can be local, it can be remote.
We will go into the details of... what happens when you communicate locally and what are the means and what are the ways that we can use to communicate with somebody at a distance. That is all that we are going to be covering in this course.
But in the start, for the sake of understanding what communication is all about, you should know that it's all about the sharing of information between two parties, local or remote. Absurdance telecommunication, we hear that word a lot, a buzzword. that we've got all around us.
Telecommunication. What is telecommunication? Tele in Greek means far, remote.
Communication, as I've just told you, means the sharing of information. To students, remote sharing of information, be it using telephony, be it using telegraphy, or be it using broadcast, video broadcast, such as television. What we mean by telecommunication...
we are trying to now share the information we are trying to now communicate with a party or multiple parties remotely since data communication is actually the exchange of data between two parties data as I've told you earlier it can be in the form of text it can be in the form of audio it can be video it can take multiple different forms but when you exchange this data between two parties, between yourself, for example, and another party, which is remote or local, we say that this is the process of data communications. Now students, we will move to the next slide and we will talk about a simple communication model. This is the simplest of the forms that we can use to explain to you what a communication model is all about.
Students, look at the top. you have got on the left hand side you've got a source. Students source is the originator of the information whether we are talking about the text as a form of data or we are talking about audio or we're talking about video our source is the actual machine it's the actual system it's the actual workstation in this particular example that produces the information or the data that needs to go to the destination.
Students after that we have got the transmitter transmitter is nothing but a machine a system that takes the originated data and converts it into a form that can be transmitted over the transmission system so students this source or transmitter combined together they make up a source system then we have got the transmission system so whatever connects the source system to the destination system is called a transmission system or a transmission medium now this can be as you can see in this example this can be a public telephone network it can be your mobile network it can be wired or wireless it can be copper wire it can be you know a 3g or a 4g wireless system it can be anything basically the medium that we're going to use to send our data from the source system to the destination system that transmission system or transmission medium is what we are going to be using to do that then students you've got your receiver so receiver receives the information and then as part of the destination system it converts that data into a format that can be understood by the destination and then you have your destination which is your ultimate destined point where the data is going to end Students, a simple communication model that shows you how this whole thing works. Of course, there are complexities. There is a lot of detail that's available and present inside each one of these boxes and arrows that you're looking at. But in its simplest form, this is what a communication model looks like.
Now, students, as an example, I've given you an example of a workstation that is trying to talk to a server. Don't worry right now if you don't understand what a workstation is. Don't worry if you... don't understand what a server is modem you must be familiar with the modem every single one of you who has got internet at your homes, there is some sort of modem that you would have at your house.
So your workstation is your laptop or your computer at home, which produces, for example, an email. And we'll look into that example a bit further. Your modem converts that into the format that can actually be transported over the public telephone network. On the receiving end, the modem receives this information and converts it back into the format that can be understood by the server.