A full-duplex system allows communication in both directions, and unlike half-duplex, allows this to happen simultaneously. Land-line telephone networks are full-duplex since they allow both callers to speak and be heard 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, Mobile Phone, etc.

Two way radios can be, for instance, designed as full-duplex systems, which transmit on one frequency and receive on a different frequency. This is also called frequency-division duplex. Frequency-division-duplex systems can be extended to farther distances using pairs of simple repeater stations, owing to the fact the communications transmitted on any one frequency always travels in the same direction.



Citation:
Duplex (telecommunications). (2006, November 3). In Wikipedia, The Free Encyclopedia. Retrieved 07:45, November 12, 2006, from http://en.wikipedia.org/w/index.php?title=Duplex_%28telecommunications%29&oldid=85399120