DATA FLOW IN COMMUNICATION

DATA COMMUNICATION 

"The process of exchanging data between devices through a transmission medium in a network is called data communication"
    However some component of data communication make us able to perform data communication and this process has some characteristic that take as characteristic of data communication . 

DATA FLOW IN COMMUNICATION

data flow communication in a network

Data flow or communication mode means the movement of data between the nodes or devices over a network on the directional flow the data flow in communication is divided into three modes which are
       i) Simplex Mode      ii) Half-Duplex Mode      iii) Full-Duplex Mode
  All these modes are used in different field of life as per its requirement and these are differ from one another according to the direction of data flow, simplex is unidirectional but the other two are bidirectional. Further explanations are,

Simplex Mode

In the first mode the data flow is unidirectional only. The data can flow from one side to another second one, the second can response but can’t send the data to first one. Graphically it is represented by one sided arrow see the figure. We can take Remote to TV data flow as the simplex mode example, in which the data flow always remote toward TV, TV just response but can’t send data to remote.  Some other example of simplex data mode includes keyboard and mouse to CPU connection, CPU to printer, scanner and sound system

Half-duplex Mode

   In half-duplex data flow mode the data flow bidirectional between nodes or device but here is a
condition apply the data can flow bidirectional but both can’t be sender or receiver at a same time. Both the side can be sender and receiver but not simultaneously.  If one half first can send data and second will be receiver and in another half second can send data and first will be receiver.  The most famous example of half- duplex data flow mode is Walki-Talki communication, both side can be receiver and sender but not same time. 

Full-duplex mode 

  In full-duplex data flow mode the data flow bidirectional like in half-duplex but here both communicating nodes can be sender and receiver simultaneously.  Now a day the most used communication mode is full-duplex mode.  Some example of full-duplex communication mode is telephone/mobile network and computer internet etc. 

data flow in data communication and networking

Difference between Simplex, Half-Duplex and Full-Duplex Mode

Simplex	Half-duplex	Full-duplex
The simplest mode of data communication, in which data flow unidirectional.	In Half-duplex the data flow bidirectional.	The data flow between nodes is bidirectional also.
Data can send from one side to another side only. One node can sender another will be receiver.	Nodes in this mode can send data and receive also but not simultaneously. At a time only one can be sender.	The data can be flow both direction simultaneously. At a time both nodes can be sender and receiver.
The less recommended data communication mode.	It works better then simplex mode but not then full-duplex.	The most preferred data communication mode.
Data send by CPU to monitor and printer are simplex mode. Monitor and printer can’t send back data.	The communication between Walki-Talki is half-duplex mode. Both side are sender and receiver at its own turn.	The communication between computers over internet and mobile over network is full-duplex mode.