Thursday, December 2, 2021

Transmission Modes in Computer Network | Simplex | Half Duplex | Full Duplex



Transmission means transferring of data between two devices. The way in which data is transmitted from one device to another device is known as transmission modes. It is also known as communication mode. 

Types of Transmission Modes

There are three types of transmission modes:


In Simplex mode, the communication is unidirectional, like as one-way street. Only one of the two devices on a link can transmit, the other can only receive. The simplex mode can use the entire capacity of the channel to send data in one direction.

Example: FM Radio, TV Broadcasting, Keyboard, Monitors.

Figure: Simplex Mode

Half Duplex

In half-duplex mode, each station can both transmit and receive, but not at the same time. When one device is sending, the other can only receive, and vice versa. The half-duplex mode is used in cases where there is no need for communication in both direction at the same time. The entire capacity of the channel can be utilized for each direction.

Example: Walkie- talkie.

Figure: Half Duplex Mode

Full Duplex

In full-duplex mode, both stations can transmit and receive simultaneously. In full duplex mode, sharing can occur in two ways: Either the link must contain two physically separate transmission paths, one for sending and other for receiving. Or the capacity is divided between signals travelling in both directions. Full-duplex mode is used when communication in both direction is required all the time.

Example: Telephone, Mobile Phones.

Figure: Full Duplex Mode

Which Transmission Mode is best for communication?

Full Duplex is best transmission mode for communication. Because User can send and receive data simultaneously. In half Duplex, when user cannot receive data while data sending process is going on.

Summary of Transmission Modes

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