METHOD FOR DETERMINING CONNECTION OF OPTICAL NETWORK TERMINALS, APPARATUS AND SYSTEM

This application provides a method for determining an optical network terminal ONT connection, a device, and a system. A device receives intensity information that is sent by a second ONT and that is of a backward optical signal generated, in a fiber-optic network, by a first upstream optical signal sent by a first ONT. The second ONT is all ONTs in a passive optical network PON system or another ONT other than the first ONT in a PON system. The device determines, based on the intensity information of the backward optical signal that is sent by the second ONT, a third ONT connected to a same optical splitter as the first ONT. An optical splitter connected to each ONT may be determined by using this method, so that when the PON system runs, a point of fault can be quickly and correctly determined based on a connection relationship determined by using this method, and the point of fault can be quickly rectified.