Single-Pair Pulse Power Transmission With FEC at Power Transitions
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Solution Overview
Problem
Conventional Power over Ethernet (PoE) systems are limited in power capacity and range, often requiring additional power sources for devices needing more than 100 W, and face data corruption issues due to high voltage pulse power transitions in Single Pair Ethernet (SPE) cables.
Innovation Solution
Implementing a system that uses pulse power transitions to control data transmission, applying Forward Error Correction (FEC) and modulating pulses to avoid data corruption, allowing for higher power delivery up to 2000 W over a single wire pair while maintaining data integrity through buffering and error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If pulse power transitions are used to deliver high power over a wire pair, then power delivery capacity is improved, but data corruption occurs during power transitions
Solution Approach 1:
The system segments the transmission medium into separate channels: one for power delivery and another for data communication. The power signal and data signal are transmitted on different wire pairs within the cable, allowing high power delivery without interfering with data integrity. This spatial segmentation resolves the contradiction by isolating the harmful power transitions from the data transmission path.
Solution Approach 2:
The system performs preliminary actions by detecting power transitions before they occur and proactively suspending data transmission during these transitions. The receiver monitors the power signal, identifies upcoming power transitions, and sends control signals to the transmitter to pause data transmission. This preemptive measure prevents data corruption before it can occur, resolving the reliability issue while maintaining high power delivery capability.
2Reliability
If data transmission is suspended during power transitions, then data integrity is improved, but transmission time is increased
Solution Approach 1:
The system implements periodic data transmission interrupted only by necessary power transition periods. By suspending data transmission only during brief power transitions and resuming immediately afterward, the system maintains high overall transmission efficiency. The periodic resumption of data transmission minimizes time loss while ensuring data integrity during power transitions.
Solution Approach 2:
The system skips data transmission only during the brief moments when power transitions occur, rushing through the essential power delivery function quickly. By minimizing the duration of suspension and immediately resuming data transmission, the system rushes through the necessary interruptions with minimal impact on overall transmission time, thus resolving the contradiction between reliability and time loss.
3Reliability
If Forward Error Correction is applied to protect data during power transitions, then data integrity is improved, but processing complexity is increased
Solution Approach 1:
The system extracts and removes data from the transmission pipeline during power transitions, holding it in buffers until the power transition completes. This extraction approach eliminates the need for complex error correction processing during transitions, as data is simply paused and resumed. The buffering mechanism provides protection without requiring sophisticated FEC algorithms, thus improving data integrity while minimizing processing complexity.
Data Source
AI summary
In one embodiment, a method includes applying Forward Error Correction (FEC) to data at power sourcing equipment, transmitting the data and pulse power over a wire pair to a powered device, identifying data transmitted during power transitions between a pulse power on time and a pulse power off time in the pulse power at the powered device, and applying FEC decoding to at least a portion of the data based on said identified power transitions.