(1) Simplex data transmission only supports data transmission in one direction; at the same time only one party can receive or send information, and two-way communication cannot be achieved, for example: TV, radio.
(2) Half-duplex data transmission allows data to be transmitted in two directions, but at a certain moment, data is only allowed to be transmitted in one direction, which is actually a simplex communication that switches directions; at the same time only One party can receive or send information, and two-way communication can be achieved. Example: Intercom.
(3) 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. It requires that the sending device and the receiving device have independent receiving and sending capabilities; You can receive and send information at the same time to achieve two-way communication, for example: telephone communication.
Extended information:
The full duplex of the network card means that the network card can receive data while sending data, and the two are synchronized. This is like we usually make a call, and we can hear the other party's voice while speaking. The current network card is generally Both support full duplex.
Simplex, half-duplex and full-duplex are the three communication channels in telecommunication computer networks. These communication channels can provide a way to convey information. The communication channel may be a physical transmission medium or a logical connection through a multiplexing medium. The physical transmission medium refers to a material substance capable of propagating energy waves, such as a wire in data communication. And logical connection usually refers to circuit switched connection or packet mode virtual circuit connection, such as wireless telecommunication channel. Thanks to the help of the communication channel, information can be transmitted without obstacles.
Simplex mode is generally used when data is transmitted in only one direction. For example, the communication between the computer and the printer is in simplex mode, because only the computer transmits data to the printer, and there is no data transmission in the opposite direction. There are also some communication channels, such as simplex wireless transmission.
