Apparatus for remotely determining fault of subscriber terminals and method thereof
View Patent ↗An apparatus for remotely determining a fault of subscriber terminals and a method thereof, and more specifically, an apparatus by which in a passive optical network (PON) system, a central office determines a remote fault of subscriber terminals, and a method thereof are provided. The apparatus for determining a remote fault of subscriber terminals includes: a frequency analysis unit recognizing a fault occurrence of a subscriber terminal from an upstream signal and analyzing the frequency spectrum of the upstream signal; and a fault determination unit selecting a specific frequency corresponding to the shape of the spectrum, determining a diagnosis signal corresponding to the specific frequency, transmitting a message requesting to upward transmit the diagnosis signal to each ONT, finding a peak frequency from the frequency spectrum of the diagnosis signal transmitted by the ONT, determining a fault of the subscriber terminal by comparing the peak frequency with the selected specific frequency.
1. An apparatus for determining a remote fault of an optical network terminal (ONT) comprising:
a frequency analysis unit configured to recognize a fault occurrence of an ONT based upon frequency spectrum analysis of a signal upwardly transmitted by the ONT; and
a fault determination unit configured to:
select a specific frequency corresponding to the shape of the frequency spectrum of the signal upwardly transmitted by the ONT,
determine a diagnosis signal corresponding to the specific frequency,
transmit to each ONT a message requesting the ONT to upward transmit the diagnosis signal,
find a peak frequency from the frequency spectrum of the diagnosis signal transmitted by the ONT, and
determine a fault of the ONT by comparing the peak frequency with the selected specific frequency.
2. The apparatus of claim 1 , wherein the specific frequency and the diagnosis signal are set as time constant or time varying.
3. A method for determining a remote fault of an optical network terminal (ONT) comprising:
recognizing a fault occurrence of an ONT from an upstream signal;
analyzing the frequency spectrum of the upstream signal;
selecting a specific frequency corresponding to the shape of the spectrum;
determining a diagnosis signal corresponding to the specific frequency;
transmitting a message requesting each ONT to upward transmit the diagnosis signal periodically;
finding a peak frequency from the frequency spectrum of the diagnosis signal transmitted periodically by the ONT; and
determining a fault of the subscriber terminal by comparing the peak frequency with the selected specific frequency.
4. The method of claim 3 , wherein the specific frequency and the diagnosis signal are set as time constant or time varying.