What is Data Communication ?


The way we live, data communication and networking changes day by day. Nowadays human life relay on computer networks and inter-networks. We need to know how the network is operate and what type of technologies are available. When we communicate we sharing the information. This sharing can be of two types: local or remote. When we communicate face to face we share the information through local while remote communication takes place over distance. For remote communication we refer the word telecommunication. It includes telephony, telegraphy television means communication at distance. The word data refer to any information presented in whatever form such as text, audio, video etc.



Data communication is the exchange of data between two devices through some form of medium. This medium can be a wire cable. For data communication, communicating devices must be part of a communication system made up of combination of physical equipment i.e. hardware and programs i.e software. Data communication’s effectiveness is depend on four fundamental characteristics: delivery, accuracy, timeliness and jitter.

Delivery
The system must send the data to correct destination with correct order.

Accuracy
the system must deliver the data accurately. Uncorrected data and alter data are not usable for data transmission.

 Timeliness
The system must deliver the data in timely manner. If data is delivered late then it is useless. For example in case of audio and video data, timely means delivering data as they are produced, in the same order as they are produced, without significant delay. This is known as real-time transmission.


Jitter
It refers the variation in packet arrival time. For example in case of video streaming, let us assume the rate of video packet arrival is 30ms. If some of the packets arrive at 30ms and some of the arrive at 40ms then uneven quality of video will show.

 


 



 


 






 

 

 

 


 



 


 

 




















 

 


 

 

 
















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