Endpoint Mapping via Serial AC Signal Sensing
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Solution Overview
Problem
Existing communication systems face challenges in accurately detecting and mapping endpoint connectivity in cable-based networks, particularly in distinguishing connected and disconnected endpoints without causing interference or requiring endpoints to be turned on.
Innovation Solution
The method involves injecting Alternating Current (AC) test signals into cable channels with resonant circuits that match the test signal frequency, allowing for serial measurements to determine which endpoints are connected, using a scanner and test circuitry to sense the signals and decide endpoint connectivity without interfering with communication or power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage or current level monitoring is used to detect endpoint connectivity, then connectivity status can be determined, but the system cannot distinguish whether the endpoint is connected or simply powered off
Solution Approach 1:
The patent introduces a resonant circuit as an intermediary component inserted in series with the cable channel. This resonant circuit acts as a mediator between the test signal and the endpoint device, enabling the system to detect endpoint connectivity independently of the endpoint's power state. The resonant circuit's frequency-selective properties allow it to respond to AC test signals while blocking DC components, creating a distinct detection mechanism that resolves the ambiguity between disconnected and powered-off states.
Solution Approach 2:
The patent changes the detection parameter from DC voltage/current levels to AC test signal frequency response. By using AC test signals and measuring the resonant circuit's frequency-selective response, the system can distinguish connected endpoints (which affect the AC signal transmission) from disconnected or powered-off endpoints (which do not). This parameter change from DC to AC domain enables reliable endpoint detection regardless of endpoint power state.
2Measurement precision
If test signals are injected to detect endpoint connectivity, then connection status can be determined, but electrical power transfer systems like Power over Ethernet may be interfered with
Solution Approach 1:
The patent uses electrical resonance (analogous to mechanical vibration) at specific frequencies to detect endpoint connectivity. The resonant circuit is designed to resonate at frequencies that do not conflict with Power over Ethernet power transfer frequencies. By operating at distinct frequency bands and using frequency-selective detection, the system can perform endpoint detection without interfering with PoE power delivery, as the resonant circuit naturally filters out frequencies outside its resonant band.
Solution Approach 2:
The patent employs periodic AC test signals at specific frequencies to probe endpoint connectivity. These periodic signals are injected through the resonant circuit, which selectively responds only to its resonant frequency. The periodic nature of the test signals allows the system to distinguish between power transfer (DC or low-frequency AC) and detection signals (high-frequency AC at resonant frequency), preventing interference with Power over Ethernet operations while maintaining accurate endpoint detection.
3Measurement precision
If serial measurements with resonant circuits are used, then accurate endpoint detection is achieved, but device complexity increases
Solution Approach 1:
The resonant circuit is designed to perform multiple functions simultaneously: it acts as a frequency-selective filter, an impedance element for signal injection, and a sensing element for endpoint detection. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in overall device complexity while maintaining high measurement precision for endpoint detection.
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
This approach provides accurate and efficient endpoint detection and mapping, enabling reliable system management and fault detection, even when endpoints are turned off or communication is inactive, without causing interference with electrical power transfer systems like Power over Ethernet (PoE).
Implementation Method 1
sensing the AC test signal over a resonant circuit, which is inserted in series with the cable and which has a resonance frequency that matches a frequency of the AC test signal
Data Source
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AI summary
A method in a communication system (20) including endpoints (24) that connect to one another using cable channels, includes injecting one or more test signals to a cable channel, which has first and second ends and is potentially connected to a first endpoint at the first end and to a second endpoint at the second end. One or more serial measurements are performed on the cable channel so as to sense the test signals. Based on the serial measurements, a decision is made as to which of the first and second endpoints are indeed connected to the cable channel.