Dual-loop bus-based network switch using distance-value or bit-mask
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United States of America Patent
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May 10, 2005
Grant Date -
Sep 12, 2002
app pub date -
Mar 12, 2001
filing date -
Mar 12, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A network switch routes switch packets among nodes with input and output ports. The nodes are connected together in a loop by two buses. One bus sends packets in a clockwise direction around the loop of nodes, while the other bus sends packets in a counter-clockwise direction around the loop. Each bus is divided into links between adjacent nodes, which examine and forward the packets to the next node in the loop. A packet is duplicated and injected onto both buses from a source node, reaching half of the nodes in one direction, and the other nodes in the opposite direction. A distance value in the packet header is set to half of the number of nodes so that the packet is removed after traveling half-way around the loop. A bit-mask in the header indicates nodes to receive the packet, or source-monitoring can remove packets half-way around the loop.
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