CONTROL METHOD FOR DOUBLE-RING NETWORK, INITIALIZATION METHOD FOR DOUBLE-RING NETWORK, TRANSMISSION STATION OF DOUBLE-RING NETWORK, AND RECONSTRUCTION METHOD FOR DOUBLE-RING NETWORK IN ABNORMALITY OCCURRENCE, AND NETWORK SYSTEM, CONTROL METHOD FOR NETWORK SYSTEM, TRANSMISSION STATION, AND PROGRAM OF TRANSMISSION STATION

摘要

PROBLEM TO BE SOLVED: To perform initialization, later operation, and return from a one-place fault while requiring a short time to the return by a generic system which is independent of a transmission path control system of an upper layer.;SOLUTION: A double-ring network is constituted so that mutual communication can be performed among transmission stations where any two adjacent transmission stations can be terminal stations among two or more transmission stations having two communication ports communicable bidirectionally, any transmission station can be a base point, and each of the stations connects mutually in a ring shape by the two communication ports through a transmission path, in which each of the transmission stations determines whether or not a frame signal is received from the adjacent transmission station, transmits a route confirmation frame signal for route confirmation to the adjacent transmission station when the frame signal is not received, and sets the own station as the terminal station instead of the present terminal station to make ring-shaped connections so that the signal is not delivered to following transmission stations when any reply to the route confirmation frame is given from the adjacent station.;COPYRIGHT: (C)2012,JPO&INPIT