Powered Device Cable-Length Detection for Maximum PoE Power
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Solution Overview
Problem
Powered devices (PDs) often operate inefficiently due to assuming a standardized cabling length, which results in underestimating the actual power available from power supply equipment (PSE), leading to reduced performance despite PSE being rated for higher power outputs.
Innovation Solution
A powered device determines the actual length of the cable connecting it to the PSE by measuring cable resistance and calculates the maximum available power, allowing it to adjust its operation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a powered device assumes a standardized cabling length, then compatibility among different devices is ensured, but the actual power available is underestimated leading to reduced performance
Solution Approach 1:
The patent changes the parameter assumption from fixed standardized cable length to dynamically determined cable length based on resistance measurements. The powered device measures cable resistance and calculates actual cable length, then uses this information to determine maximum available power, allowing the device to adapt its performance level to match actual power availability rather than operating conservatively based on standardized assumptions.
2Adaptability or versatility
If a powered device operates based on standardized power assumptions, then device compatibility is maintained, but power efficiency is reduced due to operating at lower power levels
Solution Approach 1:
The patent implements a feedback mechanism where the powered device continuously monitors cable resistance to determine actual cable length and power availability. Based on this feedback information, the device adjusts its power consumption and operational performance dynamically, operating at higher power levels when cable conditions permit rather than being constrained by standardized assumptions.
3Measurement precision
If cable resistance is measured to determine actual cable length, then accurate power availability determination is achieved, but device complexity increases
Solution Approach 1:
The patent enables the powered device to perform self-diagnosis by measuring cable resistance and calculating its own power availability. The device uses existing electrical characteristics and simple resistance measurements to determine cable length and adjust its operation, eliminating the need for external measurement equipment or complex infrastructure while achieving precise power availability determination.
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 enables powered devices to operate at higher power levels, enhancing efficiency and performance by accurately determining the available power based on cable characteristics.
Implementation Method 1
The powered device may determine the length of a cable connecting the powered device to power supply equipment based, at least in part, on a resistance of the cable
Implementation Method 2
The processing device may determine, based on the length of the cable, a maximum power available to the powered device from the power supply equipment
Data Source
AI summary
In some implementations, a method is provided. The method may allow a powered device to determine the maximum power available from power supply equipment. The method includes determining the length of a cable connecting the powered device to the power supply equipment based on the resistance of the cable. The method further includes determining the maximum power available to the powered device based on the length of the cable. The powered device may then be operated based on the maximum power available.