CAN OPERATED ON AN OPTICAL DOUBLE-RING AT IMPROVED FAULT-TOLERANCE

The use of a fibre optic ring with a multiple access protocol designed to work on an electrical bus is investigated in this study. An algori thm is presented for interfacing the existing network controller with an optical double ring in such a way that the ring appears to be the e quivalent of an electrical bus. The trade-off between cost and perform ance for a double ring in this application is acceptable and the inher ent redundancy in the topology gives good fault tolerance at the expen se of an extra hardware and software in each network node.