Powered Communications Interface Pre-Operating Mode Signaling
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Solution Overview
Problem
Traditional Power over Ethernet (POE) systems cannot facilitate communications between a powered device (PD) and power sourcing equipment (PSE) when normal operating power is not supplied to the PD, limiting signaling capabilities and hindering functions that require power conservation or emergency overrides.
Innovation Solution
The system employs extended use of low voltages and currents for detection and classification to enable information signaling between PD and PSE, allowing PDs to present additional signatures or identity networks to convey information even when power is withheld, using existing POE infrastructure and circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full power (48V) is supplied to the PD for normal operation, then the PD can operate communications circuitry and perform high-speed data communications, but power consumption increases and power conservation cannot be achieved
Solution Approach 1:
The system performs detection and classification operations at low voltages (less than 15V) before applying full 48V power. This preliminary action allows the PSE to identify the PD's power requirements and establish communications capability without immediately consuming full power, enabling power conservation while maintaining the ability to communicate when needed.
Solution Approach 2:
The system applies only the necessary portion of full power (48V) rather than continuous full power. By using low voltages for detection and classification, and only applying full power when actually needed for operations, the system achieves partial action that conserves power while maintaining communications capability when required.
2Use of energy by moving object
If power is withheld from the PD for power conservation, then power consumption decreases, but the PD cannot present signatures or convey information to the PSE
Solution Approach 1:
The PSE performs preliminary detection and classification operations at low voltages before withholding power. This preliminary action establishes the PD's identity and power requirements without requiring continuous power supply, enabling the system to conserve power while maintaining the ability to detect and classify the PD when needed.
Solution Approach 2:
The low voltage detection and classification operations serve as an intermediary mechanism that enables information transfer between PSE and PD without requiring full power. This intermediary action allows the PD to present signatures and convey information during low-power states, bridging the gap between power conservation and communications capability.
3Use of energy by moving object
If low voltages are used for detection and classification, then power consumption decreases, but the ability to operate communications circuitry and perform high-speed data communications is limited
Solution Approach 1:
The system uses low voltages for preliminary detection and classification operations, then transitions to full 48V power when high-speed data communications are required. This preliminary action at low power consumption enables the system to identify when communications are needed and prepare accordingly, achieving low power consumption during idle periods while maintaining high productivity when operations are required.
Data Source
AI summary
A powered device can provide information to another device (such as a power sourcing equipment) via a powered communications interface when operating power is not being provided to the powered device via the powered communications interface, enabling a variety of functions and applications. Relatively low voltages and currents of the type used for detection and classification of the powered device are used in an extended way to achieve the communications. The power sourcing equipment performs additional detections and/or classifications, and the powered device responds by presenting corresponding signatures or identity networks that convey additional information beyond the presence and power requirements of the powered device. As an example, a powered device can present a sequence of signatures signifying that power should be applied to the powered device notwithstanding an active policy of withholding power in furtherance of a power conservation scheme. Many other kinds of information can be signaled for a variety of system-level purposes and using a variety of signal forms using the relatively low signaling voltages and currents.