Apparatus for remotely determining fault of subscriber terminals and method thereof

• US 7,386,234 B2
• Filed: 04/05/2005
• Issued: 06/10/2008
• Est. Priority Date: 09/02/2004
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Koh, Jai Sang, Kang, Hyun Seo, Lee, Byung Tak, Lee, Mun Seob
• Primary Examiner(s): SINGH, DALZID E
• Application Number:
  US11/098,701
• Publication Number:
  US 20060051088A1
• Time in Patent Office: 1,162 Days
• Field of Search: 398 13- 16, 398/9, 398/10, 398/17, 398/20, 398/31, 398/33, 398 66- 69, 398/71, 398/72
• US Class Current: 398/67
• CPC Class Codes: H04B 10/00 Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements

Abstract

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.

Claims

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.