The Duplex reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Duplex

Often, duplex is the having of two principal elements or parts.

In communications, duplex means "two-way" when referring to communications channels.

• A simplex channel is a one-way channel.
• A half-duplex channel is one that can carry information in both directions, but cannot carry it in both directions at the same time.
• A full-duplex channel is a channel which can carry information in both directions at once.

These terms apply also to early PC sound cards. Most are now full-duplex.

Where channel access methods are used for dividing forward and reverse communication channels on the same physical communications medium, they are known as duplexing methods, such as:

• Time division duplex (TDD) is the application of Time division multiple access to separate outward and return signals
• Frequency division duplex (FDD) is the application of Frequency division multiple access to separate outward and return signals

---

A duplex home is a type of housing.

This is the "Duplex" reference article from the English Wikipedia. All text is available under the terms of the GNU Free Documentation License. See also our Disclaimer.