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private automatic branch exchange (PABX)

Definition

private automatic branch exchange (PABX)

A private automatic branch exchange (PABX) is an automatic telephone switching system within a private enterprise. Originally, such systems - called private branch exchanges (PBX) - required the use of a live operator. Since almost all private branch exchanges today are automatic, the abbreviation "PBX" usually implies a "PABX."

Some manufacturers of PABX (PBX) systems distinguish their products from others by creating new kinds of private branch exchanges. Rolm offers a Computerized Branch Exchange (CABX) and Usha Informatics offers an Electronic Private Automatic Branch Exchange (EPABX).

For additional information, see private branch exchange.

Related glossary terms: gigapop (gigabit point-of-presence), NBMA (non-broadcast multiple access), ATU-R (ADSL Terminal Unit - Remote), ring, passive FTP, dark fiber, Router, satellite news gathering (SNG), plane (in networking), bus network

Contributor(s): Mario Grullon Damian

This was last updated in April 2005

Posted by: Margaret Rouse

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