Network Diagnostic Method Using TDR Signal Analysis
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Solution Overview
Problem
Existing network diagnostic methods face challenges in accurately and efficiently locating and identifying cabling issues such as cable opens, shorts, and impedance mismatches in Gigabit Ethernet networks, as they require physical inspections and may not effectively distinguish between different types of faults.
Innovation Solution
A method utilizing Time Domain Reflectometry (TDR) with a transmitter, receiver, canceller, and hybrid to transmit and receive test signals, extracting coefficients, and determining indices and polarities to identify cabling issues by analyzing reflections, allowing for remote and non-invasive diagnosis of network faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional network diagnostic methods are used, then physical inspection is required, but the diagnostic efficiency and accuracy are reduced
Solution Approach 1:
The patent replaces manual physical inspection with automated electronic signal analysis. TDR signals are transmitted through the cable and reflections are electronically captured and processed to automatically identify fault locations and types, eliminating the need for technicians to physically trace and test cable segments manually.
Solution Approach 2:
The patent introduces TDR signal reflections as an intermediary to indirectly detect cable faults. Instead of directly examining the cable physically, the system transmits test signals and analyzes the reflected waves, which carry information about impedance changes caused by faults, enabling remote fault identification.
2Reliability
If traditional diagnostic methods are used, then multiple inspection steps are required, but the diagnostic process becomes complex and time-consuming
Solution Approach 1:
The patent combines multiple diagnostic functions into a single integrated system. The same TDR-based apparatus performs both fault location and fault type identification by analyzing reflection characteristics, eliminating the need for separate inspection procedures and reducing overall diagnostic complexity.
Solution Approach 2:
The patent analyzes different parameters of the reflected TDR signal (amplitude, polarity, waveform shape) to distinguish between different fault types. By monitoring these signal parameters, the system can automatically identify whether a fault is an open circuit, short circuit, or impedance mismatch without requiring separate diagnostic procedures.
3Ease of operation
If TDR signal analysis is performed without hybrid mode switching, then the signal reception is limited, but the fault detection capability is reduced
Solution Approach 1:
The patent dynamically switches the hybrid between different modes (receive mode and transmit mode) to optimize signal reception and transmission. This dynamic switching enables the system to first receive reflected TDR signals for fault detection, then transmit new test signals for further analysis, improving both operational flexibility and measurement precision.
Solution Approach 2:
The patent employs periodic switching between hybrid modes to systematically perform different diagnostic functions. The hybrid alternates between receiving reflected signals and transmitting new test signals in periodic cycles, enabling comprehensive fault analysis through repeated measurement cycles with different signal configurations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and efficient remote diagnosis of cabling issues by determining the location and type of faults, reducing the need for physical inspections and improving fault detection accuracy in Gigabit Ethernet networks.
Implementation Method 1
Time Domain Reflectometry (TDR), similar to the principle of the radar, is the analysis of a conductor (wire, cable, or optical fiber) by sending a pulsed signal into the conductor, and then examining the reflection of the pulsed signal
Data Source
AI summary
A method for network diagnosis between a source end and a destination end coupled by a transmission line is provided. The method includes the following steps. First, a first test signal is transmitted from the transmitter to the receiver when the hybrid is set to a first mode. Next, a plurality of first coefficients are extracted from the first test signal received by the canceller during a first period, wherein each one of the first coefficients has an index corresponding to a received order. And then, the hybrid is switched to a second mode to generate a second test signal by sending an original signal to the receiver and the destination. Sequentially, a plurality of second coefficients are extracted from the second test signal received by the canceller during a second period, wherein each one of the second coefficients has an index corresponding to a received order. Therefore, a first index is determined when an absolute value of one of the first coefficients substantially exceeds a first threshold value. A second index and a polarity of a peak are determined according to a referenced signal that is obtained by subtracting the first coefficients from the second coefficients. At last, a location with a cabling issue is determined according to the first index and the second index.