Definition

half-duplex

Half-duplex data transmission means that data can be transmitted in both directions on a signal carrier, but not at the same time. For example, on a local area network using a technology that has half-duplex transmission, one workstation can send data on the line and then immediately receive data on the line from the same direction in which data was just transmitted. Like full-duplex transmission, half-duplex transmission implies a bidirectional line (one that can carry data in both directions).

This was last updated in April 2005

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Having worked on half duplex systems I can tell you your definition is totally incorrect. A single channel two way system which relies on time division sharing is a simplex system. A half duplex system utilizes two channels at different frequencies. A reapeater(radio) performs a frequency translation of the uplink channel/frequency to the downlink/frequency. Half duplex systems are high power, wide area systems mainly used in PMRS.
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