Network with a Fast-Switching Optical Core
First Claim
1. A communications network comprising:
- a set of switch units arranged in switch planes, each switch plane comprising a subset of said switch units interconnected in a full-mesh structure;
a plurality of source nodes, each source node connecting to a switch unit in each switch plane through at least one upstream channel wherein a first set of source nodes connecting to any switch unit and a second set of source nodes connecting to any other switch unit have a number of common source nodes not exceeding a predefined upper bound; and
a plurality of sink nodes, each sink node connecting to each of selected switch units, one selected switch unit in each switch plane, through at least one downstream channel.
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Abstract
A high capacity network comprises a plurality of edge nodes with asymmetrical connections to a plurality of switch planes, each switch plane comprising fully meshed fast-switching optical switch units. Upstream wavelength channels from each source edge node connect to different switch planes in a manner which ensures that upstream wavelength channels from any two edge nodes connect to a common switch unit in at most a predefined number, preferably one, of switch planes. Thus, switch units in different switch planes connect to upstream channels from orthogonal subsets of source edge nodes. In contrast, downstream wavelength channels from a switch unit in each switch plane connect to one set of sink edge nodes. In an alternate arrangement, the upstream and downstream asymmetry may be reversed.
73 Citations
25 Claims
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1. A communications network comprising:
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a set of switch units arranged in switch planes, each switch plane comprising a subset of said switch units interconnected in a full-mesh structure; a plurality of source nodes, each source node connecting to a switch unit in each switch plane through at least one upstream channel wherein a first set of source nodes connecting to any switch unit and a second set of source nodes connecting to any other switch unit have a number of common source nodes not exceeding a predefined upper bound; and a plurality of sink nodes, each sink node connecting to each of selected switch units, one selected switch unit in each switch plane, through at least one downstream channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A communications network comprising:
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a set of switch units arranged in switch planes, each switch plane comprising a subset of said switch units interconnected in a full-mesh structure; a plurality of source nodes, each source node connecting to a switch unit in each switch plane through at least one upstream channel; a plurality of sink nodes, each sink node connecting to a switch unit in each switch plane through at least one downstream channel; wherein a first set of sink nodes connecting to any switch unit and a second set of sink nodes connecting to any other switch unit have a number of common sink nodes not exceeding a predefined upper bound.
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18. A communications network comprising:
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a set of switch units arranged in switch planes, each switch plane comprising a subset of said switch units interconnected in a full-mesh structure; a plurality of source nodes; a plurality of sink nodes; a plurality of upstream wavelength routers each connecting a first number of source nodes selected from among said plurality of source nodes to a second number of wavelength demultiplexers each wavelength demultiplexer connecting to one of said switch planes; and a plurality of downstream wavelength routers each connecting a third number of wavelength multiplexers to a fourth number of sink nodes selected from among said plurality of sink nodes, each wavelength multiplexer connecting to one of said switch planes; wherein each source node connects to a switch unit in each switch plane through at least one upstream channel routed through one of said upstream wavelength routers wherein a first set of source nodes connecting to any switch unit and a second set of source nodes connecting to any other switch unit have a number of common source nodes not exceeding a predefined upper bound. - View Dependent Claims (19, 20, 21)
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22. A communications network comprising:
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a set of switch units arranged in Π
>
1 switch planes indexed as 0 to (Π
−
1), each switch plane comprising a subset of G>
1 switch units interconnected in a full-mesh structure, G being a prime number, and switch units of each switch plane are indexed as 0 to (G−
1); anda plurality of edge nodes arranged into G edge-node groups each edge-node group comprising at most Q>
1 edge nodes, and an edge node within an edge-node group γ
, 0≦
γ
<
G, is indexed as (j, γ
), 0≦
j<
Q<
G;wherein a switch unit of index k, 0≦
k<
G, in switch plane p, 0≦
p<
Π
, has at least one upstream channel from each of at most Q edge nodes of indices j and γ
=(k+p+j×
p)modulo G, 0≦
j<
Q, and at least one downstream channel to each of at most Q edge nodes of indices j and γ
=k, 0≦
j<
Q;thereby a subset of source nodes connecting to each switch unit is orthogonal to a subset of source nodes connecting to each other switch unit in said set of switch units and a subset of sink nodes connecting to each switch unit in each switch plane connects to a single switch unit in each other switch plane.
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23. A communications network comprising:
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a plurality of edge nodes grouped into G>
1 edge-node groups, G being a prime number, each edge-node group comprising at most Q>
1 edge nodes, and edge nodes within an edge-node group γ
, 0≦
γ
<
G, are indexed as (j, γ
), 0≦
j<
Q; anda set of switch units arranged in Π
>
1 switch planes indexed as 0 to (Π
−
1), each switch plane comprising a subset of G switch units interconnected in a full-mesh structure and switch units of each switch plane are indexed as 0 to (G−
1);wherein an edge node of index (j, γ
), 0≦
j<
Q<
G, 0≦
γ
<
G, has at least one upstream channel to a switch unit of index ((G−
1−
j)p+γ
)modulo G, in each switch plane p, 0≦
p<
Π
, and at least one downstream channel from a switch unit of index γ
in each switch plane p, 0≦
p<
Π
,thereby a subset of source nodes connecting to each switch unit is orthogonal to a subset of source nodes connecting to each other switch unit in said set of switch units and a subset of sink nodes connecting to each switch unit in each switch plane connects to a single switch unit in each other switch plane. - View Dependent Claims (24, 25)
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Specification