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United States Patent | 4,095,055 |
Gotoh , et al. | June 13, 1978 |
A multi-stage switching network in a telecommunication switching system includes a virtual link frame having fixedly closed virtual switches which are inserted according to the switching system size required by the application range of telephone traffic into a specified intermediate stage of the multi-stage switching network to permit the switching network of large or upper size to be degenerated to a switching network with smaller numbers of stages by degeneratively inducing a partial path structure from the path structure of the upper sized switching network having a great traffic capacity. The switching network with smaller numbers of stages can be incremented to a switching network of larger or upper size according to the switching system size. In either case, the multi-stage switching network can be controlled by the same control circuit and the same control program.
Inventors: | Gotoh; Kazuhiko (Fuchu, JA), Kawashima; Hiroshi (Kodaira, JA), Katayama; Tsuyoshi (Hachioji, JA) |
Assignee: |
Nippon Telegraph and Telephone Public Corporation
(Tokyo,
JA)
|
Appl. No.: | 05/740,822 |
Filed: | November 11, 1976 |
Nov 17, 1975 [JA] | 50-137952 | |||
Current U.S. Class: | 379/274 |
Current International Class: | H04Q 3/68 (20060101); H04Q 3/64 (20060101); H04Q 11/04 (20060101); H04Q 003/42 (); H04Q 003/52 () |
Field of Search: | 179/18G,18E,18EA,18J 325/4 |
3867583 | February 1975 | Dorazio, Jr. et al. |
3963872 | June 1976 | Hagstrom et al. |
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