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Digital PBX With Integrated Local Area Network

IP.com Disclosure Number: IPCOM000042709D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Norstedt, BE: AUTHOR [+2]

Abstract

A digital PBX (Private Branch Exchange) for combined voice and data can be constructed to support both normal point-to-point circuit switched traffic as well as any-to-any packet switched traffic at the same time. A PBX is normally used for establishing point-to-point connections to allow for the subscribers to communicate with one another in pairs. Using a combined voice and data PBX, one can, in addition to establishing normal telephone calls, also set up point-to-point connections for data equipment. For many types of data equipment, such as display terminals, the traffic pattern is not point-to-point. Instead a large number of terminals may want to communicate with only one or very few main computers of a corporation, containing large data bases.

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Digital PBX With Integrated Local Area Network

A digital PBX (Private Branch Exchange) for combined voice and data can be constructed to support both normal point-to-point circuit switched traffic as well as any-to-any packet switched traffic at the same time. A PBX is normally used for establishing point-to-point connections to allow for the subscribers to communicate with one another in pairs. Using a combined voice and data PBX, one can, in addition to establishing normal telephone calls, also set up point-to- point connections for data equipment. For many types of data equipment, such as display terminals, the traffic pattern is not point-to-point. Instead a large number of terminals may want to communicate with only one or very few main computers of a corporation, containing large data bases. Furthermore data communication is often more dynamic than voice communication, thus requiring packet-switched operation instead of circuit-switched operation, provided with the normal PBX. For instance, one terminal may want to communicate with several other systems at the same time. This kind of requirement is met with a Local Area Network (LAN), consisting of a high speed link, which is wired to all units of data equipment on the premises. The use of the link is shared among the data equipment units. A drawback with this approach is that one must maintain two separate sets of wires in the building: one for telephone and one for data traffic. One could otherwise get by...