Simplex and Duplex Transmission.

•  Simplex.

–  One-way transmission.
–  Only one wire is needed to connect the two devices
–  Like communication from computer to a printer.

•  Half-Duplex.

–  Two-way transmission but one way at a time.
–  One wire is sufficient.

•  Full-Duplex.

–  Data flows both ways at the same time.
–  Two wires are needed.
–  Like transmission between two computers.

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