UNINTERRUPTIBLE RING NETWORK, UNINTERRUPTIBLE TRANSMISSION SYSTEM, NODE DEVICE FOR UNINTERRUPTIBLE RING NETWORK AND METHOD FOR UNINTERRUPTIBLE TRANSMITTING AT THE TIME OF GENERATING FAULT IN RING NETWORK

摘要

PROBLEM TO BE SOLVED: To eliminate interruption of data at the time of a fault by sending a switch request in a direction reverse to the generation path of the fault when the fault is generated at a transmission line and hourly phase-adjusting a signal before the generation of the fault sent from an add station to be a signal after the generation of the fault to output. ;SOLUTION: When a node station 10-C detects generation of the fault at the transmission line between with a node station 10-B, the switch request is sent in the direction of a node station 10-D by a switch byte, and a D station receiving this transfers the switch request to a node station 10-A when its own station is a through station. At the time of judging its own station to be an add station, an A station bridge-processes the switch node, inserts a path signal before the generation of the fault read from a memory into a transmission line in a direction reverse to the fault generating transmission line and information showing a bridge state to a switch byte by a space channel to output. A C-station adjusts the phases of the path signal sent from the A-station and the path signal of an active channel and outputs the path signal of a stand-by channel from the A station received after the generation of the fault to a low-speed transmission line.;COPYRIGHT: (C)2000,JPO