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United States Patent | 4,985,892 |
Camarata | January 15, 1991 |
A Local Area Network (LAN) is disclosed which enables a generalized data communication facility to be established over ordinary telephone wiring. The disclosed technique provides a completely general LAN architecture with any access protocol and is well suited to CSMA/CD (carrier sense, multiple access with collision detection). The invention consists of architectural and circuit techniques which enable the construction of a local area network(s) (LAN) over ordinary wiring within a building or between buildings within a short distance of each other (often called a campus). The LAN is implemented without disturbing the normal voice function of the telephone circuits and without the need to string addirional wiring. Implementing a LAN in accordance with this invention only requires three types of hardware functional elements (in the appropriate quantities for the application): (a) a Node Unit (NU), (b) Repeater Unit (RU), and (c) depending on the size of the network, possibly a Pulse Regenerator Unit (PRU).
Inventors: | Camarata; Joseph M. (Palos Verdes Peninsula, CA) |
Assignee: |
Xerox Corporation
(Stamford,
CT)
|
Appl. No.: | 06/616,348 |
Filed: | June 1, 1984 |
Current U.S. Class: | 370/490 ; 370/492; 370/493; 370/497 |
Current International Class: | H04L 12/46 (20060101); H04L 12/44 (20060101); H04M 11/06 (20060101); H04J 001/02 () |
Field of Search: | 370/85,76,94,123,124 179/18AD |
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55-23668 | Feb., 1980 | JP | |||
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