The authors examine the issues concerning the scalability ofBatcher/banyan networks to architectures suitable for large broadbandcentral offices. Their intent is to provide a first-round objectivecomparison of alternative switch architectures based on Batcher/banyantechnologies which can provide 1 Tb/s of raw bandwidth. Scaling issuesassociated with large central office switching fabrics are examined.Device count is used as a measure to compare the complexity of eacharchitecture. This provides a relative measure of the physical size andthe power requirements that can be expected from each approach. Allconfigurations assume the use of compact three-dimensional packaging andcustom VLSI circuits to minimize size and connectivity constraints
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