Half-duplex is a type of communication in which data flows easily back and forth between two devices, but does not simultaneously (continuously). Each device sends and receives data in a half-duplex system, but only one device can transmit at a time.

An example of a half-duplex device is a CB (citizens band) radio. It is the same CB protocol used by truckers, police officers, and other mobile personnel, while it allows users to communicate back and forth in a specific radio frequency.

Since the CB protocol only supports half-duplex communication, only one person can talk at a time. This is why people who communicate in two-way radios often say ” over ” after a statement.

This is an easy way to tell the recipient that they can now respond.

Most communication protocols are designed for full-duplex, not half duplex.

Full-duplex communication allows computers and other devices to communicate back and forth at the same time. Where some computer networks are set up in half-duplex mode to limit bandwidth , full-duplex communication is more common.

Half-duplex is abbreviated to ” HDX “.

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