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There are three ways of data communication: (1) simplex communication, which only supports data transmission in one direction; (2) half-duplex communication, which allows data to be transmitted in both directions; (3) full-duplex communication, which allows data to be transmitted in both directions at the same time.

There are three ways of data communication:

The information transmitted in the computer network is all digital data, the communication between computers is the way of data communication, and data communication is the communication mode of the combination of computer and communication line.

According to the allowed transmission direction, the data communication mode can be divided into three modes: simplex communication, half-duplex communication and duplex communication.

According to the direction of data transmission on the line, the communication mode can be divided into simplex communication, half-duplex communication and full-duplex communication.

Simplex communication only supports data transmission in one direction, also known as one-way communication. For example, radio and television broadcasting are simplex communications.

Half-duplex communication allows data to be transmitted in both directions, but only in one direction at the same time. It is actually a simplex communication with switchable directions. That is, both sides of the communication can send a message, but not both at the same time (of course, it cannot be accepted at the same time). This method is generally used in non-backbone lines of computer networks.

Full-duplex communication allows data to be transmitted in both directions at the same time, also known as two-way simultaneous communication, that is, both parties of communication can send and receive data at the same time. For example, modern telephone communications provide full-duplex transmission. This kind of communication is mainly used for the communication between computer and computer.

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