Accurately set the parameters of the OTDR, select the appropriate test range file, apply the amplification function of the instrument, and accurately place the cursor on the corresponding inflection point, such as the inflection point of the fault point, the start point of the. Accurately set the parameters of the OTDR, select the appropriate test range file, apply the amplification function of the instrument, and accurately place the cursor on the corresponding inflection point, such as the inflection point of the fault point, the start point of the. This paper provides a detailed overview of the fault detection techniques in optical fiber network with a background examining the types of faults as perceived by local monitoring centers known as Network Operations Centers. It emphasizes the need for the fault detection and fault classification. Positioning and identifying failures in an optical fiber cable line is crucial for maintaining the integrity and efficiency of the network. The following are key methods and techniques used for optical fiber cable line failure positioning: Visual Inspection: Perform a visual inspection of the. Unlike the old traditional methods, the advantages of wavelet transform in singular signal detection and signal filtering are used to analyze the Optical Time Domain Reflec-tometer curve signal and the fault detection method of fiber communication links with no relay and a large span in a high. Unlike the old traditional methods, the advantages of wavelet transform in singular signal detection and signal filtering are used to analyze the Optical Time Domain Reflectometer curve signal and the fault detection method of fiber communication links with no relay and a large span in a high. This document describes the guideline for locating the fault in optical fiber cable after installation or during maintenance of the cable. Optical fiber cables. For optical cables, there will also be various faults, so what are the methods for locating faults in optical cable lines? While understanding these methods, we also need to improve the accuracy of optical cable fault location. Correct and proficient in the use of the.