Simplex, half duplex , full duplex
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Simplex data transfer only supports data transfer in one direction;
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Half-duplex data transmission allows data to be transmitted in both directions, but, at a certain moment, only allows data to be transmitted in one direction, it is actually a simplex communication that switches directions;
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Full-duplex data communication allows data to be transmitted in both directions at the same time. Therefore, full-duplex communication is a combination of two simplex communication methods, which requires that both the sending device and the receiving device have independent receiving and sending capabilities.
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The full duplex of the network card means that the network card can also receive data while sending data, and the two are synchronized. Current network cards generally support full duplex.
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When it comes to full- duplex, it is necessary to mention another concept that closely corresponds to it, that is, " Half Duplex". The so-called half-duplex means that only one action occurs in a period of time. To give a simple example , On a narrow road, only one car can pass at the same time. When there are two cars facing each other, in this case, only one car can pass first, and the other car can drive after the first one. This example is the image It illustrates the principle of half-duplex. Early walkie-talkies, as well as early hubs and other devices were based on half-duplex products. With the continuous advancement of technology, the half-duplex union has gradually withdrawn from the stage of history.