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US 7,020,135 B2Granted
Rearrangeable switch having a non-power of two number of physical center stages
AssigneeCiena Corporation
InventorsDaniel E. Klausmeier, Jeffrey T. Gullicksen
Life of this patent
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Abstract
A switch is provided that includes three stages. The first stages has a plurality of switch circuits. The second stage has a plurality of switch circuits equal to N, where N is any integer other than a power of 2 and where the switch circuits can be logically configured into a logical configuration of a power of 2. The third stages includes a plurality of switch circuits.
Claims10
A rearrangeable, non-blocking switch, comprising:
- a first stage including a plurality of first switch circuits, each of said plurality of first switch circuits including a plurality of inputs and a plurality of outputs;
- a second stage including a plurality of second switch circuits, each of said plurality of second switch circuits including a plurality of inputs, each of which being respectively coupled to one of said plurality of outputs of each of said plurality of first switch circuits, and a plurality of outputs, a number of said plurality of second switch circuits equaling N, where N is an integer other than a power of 2;
- and
- a third stage including a plurality of third switch circuits, each of said plurality of third switch circuits including a plurality of inputs and a plurality of outputs, each of said plurality of inputs of each of said plurality of third switch circuits being coupled to a respective one of said plurality of outputs of each of said plurality of second switch circuits,
- wherein at least some of said plurality of second switch circuits are each configured as a plurality of logical switch circuits, wherein a Looping Algorithm is used as a control algorithm for the switch.
2 more elements
A rearrangeable, non-blocking, three-stage switch configured as a Clos network, said switch comprising:
- a plurality of physical center stage switch circuits, a number of said plurality of physical center stage switch circuits equaling N, where N is an integer other than a power of 2;
- a plurality of logical center stage switch circuits equaling N*f, where f is a number of logical center stage switch circuits per physical center stage switch circuit, wherein the plurality of physical center stage switch circuits are configured into the plurality of logical center stage switch circuits;
- and
- a subset of the plurality of logical center stage switch circuits equaling n, where n is less than N*f and n is a power of 2.
1 more element
Dependencies are inferred from the claim text.