Patent ID: 9692505
Date: 2017-06-27
CPC Classifications: H04B,H04J,H04L,H04Q

Claim:
1. A method of rogue network interface device detection, the method comprising: receiving a first optical signal, from a first network interface device of a plurality of network interface devices, during a timeslot allocated to the first network interface device, wherein the first optical signal includes data from one or more subscriber devices; receiving a second optical signal from the first network interface device during a quiet timeslot, wherein the second optical signal includes data that is embedded with a unique identifier, wherein the second optical signal is different than the first optical signal, wherein the unique identifier identifies the first network interface device, and wherein the quiet timeslot comprises a timeslot that is not allocated to any of the plurality of network interface devices for upstream transmission; determining whether to identify the first network interface device from the plurality of network interface devices as a rogue network interface device based on the unique identifier being the same as a unique identifier that identifies the first network interface device; determining that no rogue network interface device was identified using the unique identifier; instructing controllers of the plurality of network interface devices to transmit a first data pattern during timeslots to which the plurality of network interface devices are not assigned; determining a data transition density of a third optical signal received during the quiet timeslot; instructing a controller of a second network interface device to transmit a second data pattern different than the first data pattern during timeslots to which the second network interface device is not assigned, wherein a data transition density of the second data pattern is different than a data transition density of the first data pattern; determining a data transition density of a fourth optical signal received during the quiet timeslot when the second network interface device is transmitting the second data pattern during timeslots to which the second network interface device is not assigned; and determining that the second network interface device is the rogue network interface device based on the data transition density of the third optical signal being different than the data transition density of the fourth optical signal.