| Summary: | 碩士 === 國立臺灣海洋大學 === 電機工程學系 === 104 === Broadband line quality test the extension of the metal character of speech (4KHZ) within the applications. Such as disconnection, bad insulation, mixed lines, and the introduction of the average type of broadband transmission characteristics such as the amount of attenuation, siganl to noise ratio, the cyclic redundancy check (CRC) and the like. But in ADSL2 + (2.2MHZ) cable quality interpretation dilemma has occurred; when entering VDSL2 (17.6MHZ), the more problems surfaced. In order to solve the broadband copper as the transmission medium quality interpretation dilemma. The direct use of the equipment itself for data quality assessment cable can achieve a more accurate and there is economic demand. In order to achieve the convenience of interpretation, the first obstacle to review the type, classification, simplify and link with the past experience in the use of inductive inference method. When the VDSL2 DSLAM and VTUR connection must first make an assessment of the link quality (Dual-End Loop Test, called DELT). Only through reliable testing tool to analyze and effectively able to detect where the problem points. Use inductive inference method and related research method retained data graphical features and obstacles link type, to provide line maintenance personnel to assess the quality of the line as Chaxiu index basis.
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