Browse Prior Art Database

Crosspoint Switch

IP.com Disclosure Number: IPCOM000072878D
Original Publication Date: 1970-Oct-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Duke, KA: AUTHOR [+2]

Abstract

This crosspoint switch tolerates failures of component switches. Since the basic configuration more readily tolerates open-circuit failure of the component switches than short-circuit failure, the present design uses switches which will more readily fail to the open-circuit mode than to short circuit mode. With this crosspoint switch it will not be possible for two units to be permanently connected or disconnected. Only a small amount of additional hardware over that required for a conventional crosspoint switch is necessary.

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Crosspoint Switch

This crosspoint switch tolerates failures of component switches. Since the basic configuration more readily tolerates open-circuit failure of the component switches than short-circuit failure, the present design uses switches which will more readily fail to the open-circuit mode than to short circuit mode. With this crosspoint switch it will not be possible for two units to be permanently connected or disconnected. Only a small amount of additional hardware over that required for a conventional crosspoint switch is necessary.

There is illustrated at 1 the actual crosspoint configuration. It is desired to connect any of the Ai blocks to any of the Bj blocks (i, j=1,2,3). A conventional crosspoint switch does not have to have the same number of A and B blocks. Any single A box may be connected as the sole input to a B box. An extra row (for the Ai) and column (for the Bj) of crosspoints is furnished. Further, every A block can be switched between two columns of crosspoint switches. Every B block can be switched between two rows of crosspoint switches. Thus, there are four routes by which a given A block can be connected to a given B block. Upon the failure of a single switch connecting an A and B block, one of the other three routes is selected. In the case of an open-circuit failure, any of the other three routes may be chosen. In the case of a short-circuit failure, this may disable the row and/or column lines associated with the failures crossp...