H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/1
H04Q 1/20 (2006.01) H04L 12/56 (2006.01)
Patent
CA 1234206
- 24 - AN ALTERNATE SELF-ROUTING PACKET SWITCHING NODE HAVING FAULT DIXON CAPABILITIES 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.
491633
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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