DSLAM Line Length and Diameter Measurement
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Solution Overview
Problem
Existing line measurement technologies, such as Dual-ended Line Testing (DELT), struggle to accurately measure line diameter and length, especially when the line diameter is unknown, leading to imprecise measurements and a lack of methods for calculating diameter.
Innovation Solution
A method and apparatus that obtain data on the relation between line length and insertion loss phase radian and loop attenuation parameter values, using this data to define length ranges and determine the midpoint-based line length and diameter, thereby improving measurement precision and enabling simultaneous measurement of line diameter and length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simple attenuation and frequency/phase tests are used to measure line length, then the measurement process is simple and quick, but the measurement precision deteriorates when the line diameter is unknown
Solution Approach 1:
The patent changes the measurement parameters from simple attenuation/frequency tests to include insertion loss phase radian and loop attenuation parameter value, which are more precise parameters that enable simultaneous determination of both line length and diameter, resolving the contradiction between measurement speed and precision
Solution Approach 2:
The patent adds the dimension of line diameter measurement to the traditional one-dimensional line length measurement, using multiple parameters (insertion loss phase radian, loop attenuation parameter value) to achieve two-dimensional characterization of the line, thereby improving precision without significantly increasing measurement time
2Ease of operation
If traditional DELT technology is used for line testing, then the test process is straightforward, but the ability to calculate line diameter deteriorates (no method provided)
Solution Approach 1:
The patent makes the DELT test system multi-functional by enabling it to simultaneously measure both line length and line diameter using the same test apparatus and parameters, thereby improving versatility while maintaining operational simplicity
Solution Approach 2:
The patent introduces insertion loss phase radian and loop attenuation parameter value as intermediary parameters that bridge the gap between simple attenuation tests and complex diameter calculations, enabling diameter determination without complicating the overall test process
3Measurement precision
If multiple parameters are collected and processed to determine line length and diameter, then measurement precision improves, but device complexity and processing requirements increase
Solution Approach 1:
The patent performs preliminary actions by pre-establishing the relationship data between line length and insertion loss phase radian, and between line length and loop attenuation parameter value, so that during actual measurement, the system only needs to query this pre-established data rather than performing complex real-time calculations, thereby reducing processing complexity while maintaining high precision
Data Source
AI summary
A line measurement method is provided. The method includes obtaining data of relation between a line length and an insertion loss phase radian, and obtaining data of relation between the line length and a loop attenuation parameter value; obtaining four length values from the data of relation between the line length and the insertion loss phase radian, and defining a length range to obtain the first and the second length range; and determining the boundary of the second length range close to a midpoint of the first length range, using a line length value corresponding to the boundary close to the midpoint as a measured line length, and using a line diameter corresponding to the line length value as a measured line diameter.