Patent ID: 6108112
Filing Date: 2000-08-22
Classification: H04B,H04L

Abstract:
In a passive optical network in which a plurality of subscriber equipment are connected to central office equipment via an optical coupler, a method of recovering non-faulty subscriber equipments from a communication failure caused by a faulty subscriber equipment, comprising the steps of:automatically locating the faulty subscriber equipment; anddeactivating only the thus located subscriber equipment, wherein the step of locating the faulty subscriber equipment includes the substeps of:selectively deactivating the subscriber equipments by sending from the central office equipment to each subscriber equipment a deactivation signal at a second wavelength different from a first wavelength, which is the wavelength of signal light where the communication failure has occurred, by wavelength-division multiplexing the deactivation signal with the signal light; andlocating the faulty subscriber unit, based on the state of the communication failure when the subscriber equipments are selectively deactivated.