Alternate self-routing packet switching node having fault detect

Details Alternate self-routing packet switching node having fault detect Alternate self-routing packet switching node having fault detect

1984-09-26

1987-07-07

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 16, H04J 116, H04J 314

Patent

active

046791868

ABSTRACT:
A self-routing switching network interconnecting a plurality of interface controllers for communicating packets and circuit switched information via multiple paths with provision for diagnostic testing by allowing only single paths between any given set of input and output ports. The network comprises stages of switching nodes that are grouped in pairs. The stages are interconnected by links and each pair of switching nodes shares the same set of input links from the preceding stage. In normal operation, a pair of nodes determines one of a multiple of paths through the switching network by one of the pair responding to address information communicated via a link from an interface controller. After establishing a path through a particular node, that node transmits the address information to the next sequential stage. In order to perform maintenance operations, all pairs of nodes within a given stage are controlled by a single input signal which, when present, cause the nodes to cease to operate in pairs and to commence singular operation. This results in only one path existing through the stage for a given set of input ports and output ports.

REFERENCES:
patent: 4347498 (1982-08-01), Lee et al.
patent: 4380063 (1983-04-01), Janson et al.
patent: 4491945 (1985-01-01), Turner
patent: 4512011 (1985-04-01), Turner
patent: 4577311 (1986-03-01), Duquesne et al.
IEEE Transactions on Computers, vol. C-31, No. 5, May, 1982, New York (US) G. B. Adams, III, et al., "The Extra Stage Cube: A Fault-Tolerant Interconnection Network for Supersystems", pp. 443-454.

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