PoE Power Priority Adjustment Using Alternative Power Status
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Solution Overview
Problem
In Power-over-Ethernet (PoE) systems, Power Sourcing Equipment (PSE) often faces challenges in efficiently allocating power among Powered Devices (PDs) during power faults, as PDs with alternative power sources may not necessarily require high priority, leading to inefficient power distribution.
Innovation Solution
The PSE adjusts the power priority of PDs with alternative power sources by reducing their priority, allowing more PDs to remain powered during a power fault by reallocating PoE power to those without alternative sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power priority is assigned to all PDs based on default criteria, then power allocation is simple and fast, but PDs with alternative power sources occupy unnecessary priority, reducing the number of PDs that can remain powered during power faults
Solution Approach 1:
The PSE monitors the power availability status of each PD and adjusts power priorities dynamically based on real-time conditions. When a PD reports having an alternative power source, the PSE reduces that PD's power priority, allowing power to be reallocated to PDs that actually need it during power faults.
Solution Approach 2:
Power priorities are not static but dynamically adjusted based on the operational status of PDs. The system transitions from a static priority assignment to a dynamic one where priorities change in response to power availability conditions, enabling optimal power distribution during both normal and fault conditions.
2Reliability
If the PSE reduces power supply to meet aggregate power limits, then available power is preserved for critical devices, but individual PDs may experience unexpected power loss
Solution Approach 1:
The PSE performs preliminary power priority assignments and monitors power availability conditions before power faults occur. By pre-configuring priority levels and monitoring alternative power source status, the system prepares for potential power shortages, ensuring that when power reduction is necessary, it follows predetermined rules that favor critical devices.
Solution Approach 2:
The system continuously monitors power consumption and availability, providing feedback to the power allocation algorithm. This enables the PSE to make informed decisions about which PDs to maintain power for, based on real-time conditions rather than static configurations.
Data Source
AI summary
Power-over-Ethernet (PoE) powered devices (PD) may be coupled to a PoE power sourcing equipment (PSE). The PDs may send to the PSE a link-layer protocol communication that comprises an alternative-power field indicating whether the sending PD has an alternative power source (e.g., a battery, a local power supply). The PSE may listen for and receive the communications and read the alternative-power fields thereof. The PSE may set respective power priorities for the PDs based at least in part on whether the PDs have respective alternative power sources, as indicated by the respective alternative-power fields of their communications. The PSE may reduce the power priority of those PDs that have alternative power sources, relative to the priority the PD would otherwise have been given.