Patent ID: 6160648
Filing Date: 2000-12-12
Classification: H04B

Abstract:
An arrangement for detecting faults in an optical fibre network comprising:at least two nodes; andat least two optical fibres coacting with the nodes to form a bus, wherein the bus end-nodes are coupled to a pair of spare fibres, wherein each node has a central module which includes at least one central processor, at least one logic unit, at least one protection signal transmitter, at least one protection signal monitor, at least two protection switches, and optical amplifiers, and wherein the protection signal transmitter is adapted for transmission of a node specific protection signal in at least one of the two directions of the bus; the nodes are adapted for detection of losses of all optical signals; and the bus end-nodes are adapted for detecting their own node specific protection signal and also the node specific protection signal of the other end-node in at least one of the two directions of said bus.