Patent ID: 7468958

Claim:
An optical line terminal (OLT) to be connected to a plurality of optical network terminals (ONTs) via a fiber, each ONT to have a timeslot during which data can be transmitted to the OLT, the OLT comprising: an interface unit to be connected to the fiber; an optical transmitter to generate and output downstream data packets to the ONTs via the interface unit; an optical receiver to receive upstream data packets from the ONTs via the interface unit, the upstream data packets having power levels; an optical power meter connected to the optical receiver to detect the power levels of the upstream data packets that are received during a sequence of transmission time slots, the optical power meter to output a plurality of measured power levels in response to detecting the power levels of the upstream data packets; and a processor connected to the optical transmitter, the optical receiver, and the optical power meter, the processor to: receive the plurality of measured power levels from the optical power meter; output downstream data to the optical transmitter, and receive upstream data from the optical receiver; form a database of measured power levels for all of the ONTs that are connected to the OLT via the fiber so that an expected power level can be determined for each ONT that is connected to the OLT via the fiber; detect a rogue ONT if a rogue is present; and identify the rogue ONT after the rogue ONT has been detected, to identify the rogue ONT, the processor to: command all of the ONTs to turn off; and measure a power level during each timeslot after the ONTs have been commanded to turn off.