Method of expanding a three-stage regular switching array
Patent 5103220 Issued on April 7, 1992. Estimated Expiration Date: 
May 21, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 21, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3593295 3674938 PCM Switching network with surplus capacity Method of adding additional subscribers and signals to existing connection Substantially non-blocking space switching arrangement Replacement switch Patent #: 4964105 InventorAssigneeApplicationNo. 526005 filed on 05/21/1990US Classes:340/2.22, Clos type340/2.23, Alternate routing370/218, Packet switching system or element379/271, Having multistage switching714/4, Of network714/43Bus, I/O channel, or network path component faultExaminersPrimary: Yusko, Donald J.Assistant: Zimmerman, Brian Attorney, Agent or FirmForeign Patent References
International ClassesH04Q 001/00H04Q 003/00 H04M 003/00 H04M 005/00 Foreign Application Priority Data1989-05-23 DEAbstractA method of expanding a regular three-stage switching array. Original switching blocks of the first and third stages having a smaller number of crosspoints are enlarged to switching blocks having a larger number of crosspoints, by combining the original switching blocks. In addition, the three stages are expanded by adding additional switching blocks. After the enlarged blocks are formed, at least one additional block is added to the second stage, and some of the connection paths between the enlarged blocks and the blocks of the second stage are rerouted to the additional blocks. The rerouting is performed for the original blocks of the second stage one at a time. In order to avoid disruption of operations during the expansion, while the rerouting is being performed for any particular original block of the second stage, the connections between that original block and the enlarged blocks which would otherwise be established, are switched through redundant connection paths in the second stage. When the rerouting for the original block is complete, these connections are switched back to the connection paths of the original and added blocks of the second stage. After repeating the above for all original blocks of the second stage, the outputs of additional blocks of the first stage and the inputs of additional blocks of the third stage are respectively connected with the inputs and outputs that are still free in the now existing original and additional blocks of the second stage.Other References
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