Power Over Ethernet Interface Power Management During PSU Faults
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Solution Overview
Problem
In industrial network deployments, network devices face challenges in maintaining reliable Power over Ethernet (PoE) power and data transmissions during power fault events, as existing techniques for PSU redundancy and rapid power down do not effectively manage multi-fault conditions, leading to potential downtime and inefficient power utilization.
Innovation Solution
A method is introduced to determine the total available power by accounting for power losses and reserved power for support components, allowing for accurate and efficient powering down of PoE interfaces without software-based communication between PSU and PoE management systems, enabling efficient power utilization and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing techniques for PSU redundancy and rapid power down are used, then power transmission reliability is improved, but the system cannot effectively manage multi-fault conditions leading to potential downtime
Solution Approach 1:
The system dynamically adjusts power distribution by continuously monitoring PSU status and recalculating available power capacity. When multi-fault conditions occur, the system adapts its power allocation strategy in real-time, transitioning from static redundancy configurations to dynamic power management that responds to changing fault conditions.
Solution Approach 2:
The invention implements feedback mechanisms where the PoE management system receives status information from PSUs and uses this feedback to determine current available power capacity. This feedback loop enables the system to detect multi-fault conditions and adjust power distribution accordingly, ensuring reliable operation despite complex fault scenarios.
2Reliability
If rapid power down techniques are implemented, then power transmission reliability is improved, but power utilization efficiency deteriorates due to inability to selectively power down interfaces
Solution Approach 1:
The system applies local quality by treating different PoE interfaces differently based on their criticality and power requirements. Instead of uniform power down, the invention identifies which interfaces can maintain operation with reduced power capacity and which must be powered down completely, applying selective power management to optimize overall power utilization while maintaining reliability.
Solution Approach 2:
The invention implements partial action by powering down only the necessary portion of power capacity rather than complete shutdown. When PSUs fail, the system calculates the exact amount of power capacity that can be reduced and applies partial power down to non-critical interfaces, avoiding excessive action that would disrupt essential services.
3Ease of operation
If software-based communication between PSU and PoE management systems is used, then system control is improved, but latency increases and efficiency decreases
Solution Approach 1:
The PoE management system performs self-service by independently determining available power capacity using locally stored information about PSU capabilities and current fault conditions. The system uses pre-configured data structures and local calculations rather than requiring real-time software communication with PSU management, enabling autonomous power capacity determination with minimal latency.
4Reliability
If all PoE interfaces are powered down during fault events, then power safety is improved, but productivity deteriorates due to complete service disruption
Solution Approach 1:
The system segments PoE interfaces into different groups based on their power requirements and criticality levels. During fault conditions, the invention applies differentiated power management to each segment, allowing some interfaces to continue operating with reduced power capacity while others are powered down, thus maintaining service continuity for essential services.
Solution Approach 2:
The invention changes operational parameters by adjusting power capacity allocation rather than simply on/off switching. The system modifies power delivery parameters dynamically, reducing power capacity for non-critical interfaces while maintaining sufficient power for essential services, thereby preserving productivity while ensuring power safety.
Data Source
AI summary
Examples described herein relate to improved powering down of PoE interfaces in a network device. In response to detecting a fault that interrupts a flow of power from the PSUs to one or more of the PoE interfaces, the examples determine a total operational power value based on an operational power value of each operational PSU of the PSUs and determine a total available power value based on the total operational power value and a reserved power value. For each of the PoE interfaces, the examples determine whether a threshold power value for the PoE interface exceeds the total available power value and power down the PoE interface in response to determining that the threshold power value for the PoE interface exceeds the total available power value.