Wire-Pair Pulse Power Timing With FEC for Reliable Data Transmission
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Solution Overview
Problem
Conventional Ethernet cabling faces challenges in transmitting data and pulse power over a single wire pair, as the edges of high voltage pulses can corrupt Ethernet packets, leading to data corruption and interference.
Innovation Solution
The implementation of a system that uses pulse power transition edges to control data transmission, suspending data transmission during power transitions and employing Forward Error Correction (FEC) to minimize data corruption, while also modulating pulse power for control plane data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage pulse power is transmitted over a wire pair, then power delivery capability is improved, but data transmission reliability deteriorates due to pulse edges corrupting Ethernet packets
Solution Approach 1:
The transmission medium is segmented into dedicated power transmission periods and dedicated data transmission periods. During power periods, pulse power is transmitted; during data periods, Ethernet packets are transmitted. This temporal segmentation prevents pulse edges from corrupting data packets while maintaining high power delivery capability.
Solution Approach 2:
The system employs periodic alternation between power transmission mode and data transmission mode. The pulse power source periodically switches between delivering high voltage pulses and delivering data signals, creating a time-division multiplexed system that eliminates interference between power and data transmissions.
2Reliability
If data transmission is suspended during power transitions, then data corruption is reduced, but data transmission efficiency deteriorates due to increased idle time
Solution Approach 1:
The system dynamically adjusts the duration of data transmission windows based on the pulse power transition timing. By optimizing the data transmission window to maximize useful transmission time while avoiding corruption periods, the system achieves high reliability without excessive idle time. The dynamic allocation of transmission windows ensures efficient use of available bandwidth.
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.