Patent Number: 7,103,274

Title: Cross-connect apparatus

Abstract: An apparatus having n-number of working cross-connects for cross-connecting an n-bit input signals arriving from a plurality of input paths on a per-bit basis; n-number of first logic circuits for calculating the exclusive-ORs of each said n-bit and applying outputs to a standby cross-connect for providing outputs; n-number of second logic circuits for calculating the exclusive-ORs of said output signals from each of said working cross-connects and from the single standby cross-connect; and third logic circuits for selecting output signals of said working cross-connects and outputs of the second logic circuits. The apparatus detects the occurrence of an abnormality in working cross-connects by monitoring the outputs of the second logic circuits, identifies the faulty cross-connect by successively turning off one of the n-inputs to the first and second logic circuits, and select outputs from the second logic circuits instead of from the faulty cross-connect by using the third logic circuits.

Inventors: Kunimatsu; Kazuhiro (Kawasaki, JP), Egoshi; Hiroya (Kawasaki, JP), Takayasu; Akio (Kawasaki, JP), Miyazaki; Yukiko (Kawasaki, JP)

Assignee: Fujitsu Limited

International Classification: G02F 1/00 (20060101); H04B 10/08 (20060101); H04B 17/02 (20060101); H04B 3/46 (20060101); H03K 17/76 (20060101)

Expiration Date: 9/05/02018