METHOD FOR STORING BUS TYPE LAN INTO HIGH SPEED OPTICAL LOOP LAN AND HIGH SPEED OPTICAL LOOP LAN SYSTEM

摘要

PURPOSE: To obtain high reliability for data transmission by maintaining a communication of a demarcation point with a bus type LAN even at the time when a fault is generated. ;CONSTITUTION: In the case generation of a fault of a high speed optical loop LAN of a '0' system is detected, a center node device 20 reports a fact that a high speed optical loop LAN of the own '1' system becomes an operating system from a standby system to local node devices 22a, 22b and 22c, and based on a control signal sent out to control lines 24b, 26b and 28b therefrom, switch devices 24a, 24b and 24c decide which of high speed optical loop LANs of the '0' system and the '1' system is the operating system. The respective switch devices 24a, 24b and 24c select data from local node devices 12a, 12b and 12c of the high speed optical loop LAN which becomes the operating system from the standby system and send them out to demarcation points 30a, 30b and 30c.;COPYRIGHT: (C)1993,JPO&Japio