Recirculation routes in switching networks used with scalable co

Details Recirculation routes in switching networks used with scalable co Recirculation routes in switching networks used with scalable co

1996-05-13

1998-08-25

Hsu, Alpus H.

Multiplex communications

Pathfinding or routing

Through a circuit switch

370405, H04L 1256

Patent

active

057990158

ABSTRACT:
The Scalable Coherent Interface (SCI) standard of the Institute of Electrical and Electronics Engineers is intended for fast, high throughput, point-to-point, unidirectional links to high-performance multiprocessor systems. A system is provided for routing packets with a plurality of data bits and target identity code bits through a packet routing switching network. The packets are transmitted from source nodes through the switching network to target nodes that are designated by the target identity code bits. Operational rings are used to link output ports of switches of the output stages to input ports of switches of the input stage wherein each operational ring is identified by ring identity code bits associated with the input stage switches of the operational rings and has at least one node which is capable of performing a function with the data. Recirculation rings are used to link output ports of switches of the output stage to input ports of switches of the input stage. The recirculation rings have no functional nodes in them. Each output port of the output stage switches is coupled to either an operational ring or to a recirculation ring, and the packets are transmitted from source nodes through the operational rings. In the event any of said packets are misrouted, then the packets are transmitted through the recirculation rings or through the operating rings that do not contain the designated target nodes until the packets reach their respective designated target nodes.

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