Wire-Pair Pulse Power Transmission With FEC for Data Integrity
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Solution Overview
Problem
Conventional Ethernet cabling systems face data corruption due to high voltage pulse power transitions, limiting the effective transmission of data and power over Single Pair Ethernet (SPE) cables, especially when higher power delivery is required for devices like workgroup routers and IoT devices.
Innovation Solution
Implementing a system that suspends data transmission during pulse power transitions, uses Forward Error Correction (FEC) to correct errors, and modulates pulse power for control plane data, thereby mitigating data corruption and enhancing data integrity over SPE cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage pulse power is transmitted over SPE cables to deliver higher power (up to 2000 W), then power delivery capability is improved, but data corruption occurs due to interference from pulse power transitions
Solution Approach 1:
The transmission medium is segmented into dedicated power delivery phases and data transmission phases. During pulse power transitions, data transmission is suspended to prevent corruption. This temporal segmentation allows high voltage pulse power to be transmitted without interfering with data integrity, resolving the contradiction between high power delivery and data reliability
Solution Approach 2:
Forward Error Correction (FEC) codes are applied to data packets before transmission during a preliminary encoding stage. This preliminary action prepares the data with error correction capability, allowing the receiver to detect and correct corruption caused by pulse power transitions, thereby maintaining data integrity while enabling high power delivery
2Reliability
If data transmission is suspended during pulse power transitions to prevent data corruption, then data integrity is improved, but transmission efficiency decreases due to idle time
Solution Approach 1:
The system employs periodic alternating phases between power delivery and data transmission. Data transmission occurs during intervals between pulse power transitions when the line is stable. This periodic action pattern ensures data integrity by avoiding transmission during disruptive power transitions while maximizing transmission efficiency by utilizing all available stable intervals
Solution Approach 2:
The receiver uses FEC decoding to detect errors caused by pulse power transitions and provides feedback about transmission quality. This feedback mechanism allows the system to identify corrupted packets and request retransmission only when necessary, optimizing the balance between data integrity and transmission efficiency
3Reliability
If Forward Error Correction is applied to correct errors from pulse power transitions, then data integrity is improved, but device complexity increases due to additional encoding/decoding requirements
Solution Approach 1:
The system changes the parameter of error correction by selecting FEC codes with different redundancy levels based on the severity of pulse power interference and data priority. This parameter adjustment allows optimization between data integrity and device complexity, applying stronger error correction only when necessary while maintaining simpler operations for less critical data
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.