Data Communication Concept | 2020

Data Communication Concept.

Data communication is the transmission of coded data between terminals and a centralized computer installation, or between two or more computer centers over established communication links.

Data Communication Concept Image.

The exchange of data between a source and a receiver via form of transmission media such as a wire cable.

Data communication is said to be local if communicating devices are in the same building or a similarly restricted geographical area.

The meaning of source and receiver are very simple. The device that transmits the data is known as source and the device that receives the transmitted data is known as receiver.

Data communication aims at the transfer of data and maintenance of the data during the process but not the actual generation of the information at the source and receiver. 

Advantages of Data Communication System

1. Time is saved in data preparation and physical transportation of prepared data.

2. Utilization of Computer’s processing power and storage capacity.

3. Quick update and retrieval of information from files.

4. Reduction in cost of data transmission.

Transmission Channel

In simple terms data communication can be defined as exchange of digital data from sender to receiver and vise versa. Data can be transmit from sender to reciever or can have back & forth exchange.

Types of Transmission Channel

There are mainly three types of transmission channel –

  1. Simplex Channel :
Data is transmitted in one direction, one can only send and the other can only receive.

In this channel transmission of data is happening in one direction, example can be radio to radio communication in which data flows from A to B.

A (Sender) -------------------------------------------------> B (Receiver)

2. Half Duplex Channel :

Data is transmitted in both directions, but at one instant at a time.

In this channel transmission of data is in both directions, but at any one instant of time it is only in one direction. That means flow of data can be from A to B or from B to A but one at a time.

A (Sender) --------------------------------------------------> B (Receiver)
B (Sender) <-------------------------------------------------- A (Receiver)

3. Full Duplex Channel :

Data is transmitted in both directions, simultaneously.

In this channel transmission of data is in both direction simultaneously. Flow of data is from A to B and from B to A at any one instant of time.

Data Transfer Rate

Information transfered speed is the speed at which data is transferred from one point to another. Information transfer speed is measured by bit and baud rate.

Bit rate indicates the speed of bits transmitted within one second.

Baud rate counts the number of times of a transmission change state.

Bit rate and Baud rate are related using below formula.

Bit Rate = Baud rate x the number of bit per baud

That’s all we are learning in this blogpost but later on we will learn the following topics here.

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