Multiplex communications – Wide area network – Packet switching
Patent
1990-12-27
1992-12-29
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 60, 370 54, H04J 324
Patent
active
051757338
ABSTRACT:
An adaptive routing means and method useful for transferring messages on a number of multi-dimensional network topologies that connect distributed multi-processing systems. A plurality of processing nodes comprising processing means for processing information and router means for routing messages are connected in a multi-dimensional network (A) with an identical or redundant message passing multi-dimensional network (B) of routers being connected to network A. Each router comprises four types of channels for message passing: 1) a channel to transfer information between a router and a processor coupled to the router, 2) a channel to transfer information in an X direction, 3) a channel for the Y direction, and 4) a channel for the Z direction. This connectivity allows messages to pass between nodes within network A, between routers within network B, or between network A and network B by passing through a router. Messages are routed in networks A and B by routing first in the X dimension and then in the Y dimension. The present invention transitions between A and B networks when contention is encountered in the X or Y direction, if the appropriate Z channel is available. If an X or Y channel is not immediately granted, a request is made for the Z channel. Both the request for an X or Y channel and the request for the Z channel are maintained until one request is granted. The message is then routed on the granted channel and the other request is withdrawn. The router does not commit to routing on a particular channel until one channel is available.
REFERENCES:
patent: 4598400 (1986-07-01), Hillis
patent: 4731825 (1988-03-01), Wojcinski et al.
patent: 5040173 (1991-08-01), Richards
Hom Shick
Intel Corporation
Olms Douglas W.
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