Modes of Data Communication

When we talk about the data communications. It involves the communication of data between two devices, mostly between the computers and sometimes other devices like cell phones, radio and T.V etc. the data travels in some particular direction or in other words, I can explain that when any data communication activity performed, there involves sending devices and receiving devices and the data, which, is being communicated, travels from sender to receiver. So, the direction in which the data travels is called “Data Communication Mode”. This data communication mode has following types.
Simplex Mode
In simplex mode type, the data travels in only one direction and there is no possibility to change the direction of data. In other words, we can say that the direction of data will always be same between the two communicating devices. The device which is receiving the data (Receiver) cannot send the data in reply, were as on the other hand the sender will always send the data and cannot receive the data in reply. So, we can say that in simplex mode of data, the data always travels in only one direction and that direction is from sender to receiver.
Half-Duplex Mode
The second type of data communication mode is “Half-Duplex Mode”. In this type the direction of data could be towards the both sides. I mean to say that data travels from sender to receiver and the receiver, in response can also send the data to sender. We can understand this Half-Duplex Mode further by the example of a server and client communication. We have a database on server and on the other hand we have a client computer. Now from the client side we send a query to server where we ask for all the records employs having the grade three. So, when we write the query on the client computer and send it to the server, the direction of data is from client to server, in response of this query, server sends all the records (data according to query) to client computer. Now, the direction of data is from server to client. So, the data direction of data is in both directions, first from client to server, then from server to client. The further important point of Half-duplex Mode is it, that though, the data ravels in both directions but at a time data can travel in only one direction, when the activity is completed in one direction, then second activity will start in other direction. In short, we can say that data cannot travel in both directions simultaneously. Though, the direction of data could be change. Half-Duplex mode is better than the Simplex Mode, but it is not a quick communication mode because the device will have to wait to change the direction until the communication in one direction is completed.
Full-Duplex Mode
The third and the speediest type of data communication mode is the Full-Duplex Mode. In this type data can be travel in both directions at a time. The sender can be receiver as at a time and the two devices send and receive data simultaneously. So, the Full-Duplex mode is the faster mode as for as the data communication modes are concerned.