Duplex communication
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A duplex communication system is one where signal can flow in both directions between connected parties.
These systems are employed in nearly all communications networks, either to allow for a "two-way street" between connected parties or to provide a "reverse path" for the monitoring and remote adjustment of equipment in the field.
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Sub-categories of duplex
Half-duplex
A half-duplex system allows communications in both directions, but only one direction at a time (not simultaneously). Any radio system where you must use "Over" to indicate the end of transmission, or any other procedure to ensure that only one party broadcasts at a time would be a half-duplex system.
A good analogy for a half-duplex system would be a one lane road with traffic controllers at each end. Traffic can flow in both directions, but only one direction at a time with this being regulated by the controllers.
Full-duplex
A full-duplex system allows communication in both directions, and unlike half-duplex allows this to happen simultaneously. Most telephone networks are full duplex as they allow both callers to speak at the same time.
A good analogy for a full-duplex system would be a two lane road with one lane for each direction.
Examples
- Telephone networks
- Mobile phone networks
- CB radio