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9. Switch Fabrics - Cross Bar Switch N x N Switch 0 1 2 3...

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Cross Bar Switch 0 1 2 3 0 1 2 3 N x N Switch N2 Cross points
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8 X 8 Delta Switch 0 1 2 3 4 5 6 7
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N X N Delta Switch . . . N/2 X N/ 2 Delta Switch N/2 X N/ 2 Delta Switch . . . . . . N x N Delta Switch lg N stages N/2 lg N 2 x 2 sub-switches
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16 X 16 Delta Switch 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 8x8 Delta 4x4 Delta
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16 X 16 Delta Switch 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Dest 7 0111
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16 X 16 Delta Switch 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Dest 8 1000
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16 X 16 Delta Switch 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Dest 7 0111 Dest 7
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4x4 Sub-Switches 0 1 2 3 0 1 2 3 4 5 6 7 4 5 6 7 8 9 10 11 8 9 10 11 12 13 14 15 12 13 14 15
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4x4 Sub-Switches 0 1 2 3 0 1 2 3 4 5 6 7 4 5 6 7 8 9 10 11 8 9 10 11 12 13 14 15 12 13 14 15 Dest 7 13 Dest 9 21
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Complexity of NXN Delta Switches Number of stages log c N, CXC sub-switches (lg N for 2 x 2) Number of sub-switches (N/C) log c N Number of cross points CN log c N Example N = 1,024 For C = 2, 10 stages - 5,120 sub-switches - 20,480 cross points For C = 4,
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9. Switch Fabrics - Cross Bar Switch N x N Switch 0 1 2 3...

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