Multi-stage switch
First Claim
Patent Images
1. A switching unit comprising:
- input means for receiving a plurality of information signals wherein the input means includes circuit boards having multiple layers to receive analog and digital information signals and multiple input switches;
output means for distributing a plurality of the information signals wherein the output means includes multiple output switches;
crosspoint means for establishing a plurality of paths between the input means and the output means wherein the crosspoint means includes multiple crosspoint switches; and
routing means for selecting a path between the input means and the output means through the crosspoint means, the routing means including means for reallocating existing paths by examining paths previously selected by the routing means and a new paths for the reallocation of paths from the input means, through the crosspoint means and to the output means to thereby overcome blocking of the new path between the input means and the output means and optimize the paths through the crosspoint means wherein the reallocation means partitions the existing paths and the new path into at least a first and second matching wherein first matching contains connections between the input switches and the output switches not common to connections between the input switches and the output switches in the second matching and deallocates the existing paths and reallocates the connections of the first matching to paths through one crosspoint switch and the connection of the second matching to paths through another crosspoint switch.
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Abstract
The present invention provides a multi-stage switch. An input or first stage receives a plurality of information signals. An output or third stage distributes a plurality of information signals. A middle or second stage establishes a plurality of signal paths between the input stage and output stage. The switch includes a routing function which selects the path between the input stage and the output stage. The routing function includes a reallocation function which reallocates existing paths to free paths to avoid signal blocking.
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Citations
16 Claims
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1. A switching unit comprising:
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input means for receiving a plurality of information signals wherein the input means includes circuit boards having multiple layers to receive analog and digital information signals and multiple input switches; output means for distributing a plurality of the information signals wherein the output means includes multiple output switches; crosspoint means for establishing a plurality of paths between the input means and the output means wherein the crosspoint means includes multiple crosspoint switches; and routing means for selecting a path between the input means and the output means through the crosspoint means, the routing means including means for reallocating existing paths by examining paths previously selected by the routing means and a new paths for the reallocation of paths from the input means, through the crosspoint means and to the output means to thereby overcome blocking of the new path between the input means and the output means and optimize the paths through the crosspoint means wherein the reallocation means partitions the existing paths and the new path into at least a first and second matching wherein first matching contains connections between the input switches and the output switches not common to connections between the input switches and the output switches in the second matching and deallocates the existing paths and reallocates the connections of the first matching to paths through one crosspoint switch and the connection of the second matching to paths through another crosspoint switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A switching unit comprising:
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input means for receiving a plurality of information signals wherein the input means includes circuit boards having layers to receive analog and digital signals and a differential receiver circuit to convert information signals into single ended signals for distribution through the switching unit, output means for distributing a plurality of the information signals; crosspoint means for establishing a plurality of paths between the input means and the output means, and routing means for selecting a path between the input means and the output means through the crosspoint mean, the routing means including means for reallocating existing paths by examining paths previously selected by the routing means and a new path for reallocation of paths from the input means, through the crosspoint means and to the output means to thereby overcome blocking of the new path.
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Specification