Efficient strictly non-blocking multicast switch architecture for time division multiplexed traffic
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United States of America Patent
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Dec 23, 2008
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app pub date -
Sep 22, 2004
filing date -
Sep 22, 2003
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Abstract
A Forward Propagation Architecture is a novel switch architecture based on well-known unicast switching architectures, and provides two desirable properties: (1) no rearrangement of established calls is ever required and (2) the architecture is strictly non-blocking for multicast, even when multicast destinations are dynamically added to existing calls. These properties (excluding dynamic multicast destination addition) can be provided by standard architectures or Time:Space:Time architectures with speedup proportional to the width of the widest multicast to be supported. The speedup required by the FPA is constant and practical (approximately 4.times. speedup) and at significantly less hardware cost than n.sup.2 architectures. The key to the FPA's capability is a sequentially doubled fabric with a feedback loop. The FPA requires a routing algorithm for connection setting. The connection-setting algorithm is sufficiently simple to be implemented in hardware.
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