Patent ID: 6985482
Filing Date: 2006-01-10
Classification: H04L

Abstract:
1. A cross-bar switch system with redundancy having a cross-bar switch set of a redundant structure, comprising: a plurality of crossbar switches for effecting connections between nodes of a plurality of nodes; and at least one additional redundant cross-bar switch, wherein: (a) a first cross-bar switch of said cross-bar switch set receives at input terminals thereof, first outputs among multiple N outputs of each of the plurality of nodes, and said one redundant cross-bar switch receives Nth outputs among N outputs of each of said plurality of nodes applied to input terminals thereof N, being an integer of 2 or more; (b) each of remaining cross-bar switches includes M selection circuits, each of which receives two consecutive outputs of an order corresponding to that of the cross-bar switch, among N outputs of each of said plurality of nodes, the outputs of these M selection circuits being input to the cross-bar switch, M being an integer of 2 or more; (c) each node of said plurality of nodes includes N selection switches, which are provided at input terminals thereof, each of said selection switches receives two consecutive outputs of an output order corresponding to that of the node, among outputs of two mutually adjacent cross-bar switches, two by two, of said cross-bar switch set; and (d) in response to a selection control signal output from a failure processing circuit that executes cross-bar switch failure processing, each of said selection circuits selects and outputs one of its two inputs and, when one cross-bar switch fails, takes the failed cross-bar switch out of service.