PoE Power Mode Switching to Prevent Camera Reboot Loops
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Solution Overview
Problem
Surveillance cameras using Power over Ethernet (PoE) face issues with endless rebooting when switched to PoE++ mode if connected to a PoE+ switch, necessitating manual web page access and physical reconnection to resolve, which is inconvenient and time-consuming.
Innovation Solution
A powered device with a processor that automatically switches to a lower PoE mode (PoE+) if the connected Power Sourcing Equipment (PSE) cannot supply the required power, identified through a test power phase during booting, preventing reboot loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the powered device operates in PoE++ mode (second power mode), then the power consumption capability is improved, but the device enters endless rebooting when connected to PoE+ switch
Solution Approach 1:
The system performs a test power supply phase during the booting process to preliminarily verify whether the PSE can provide sufficient power before fully entering the second power mode. This preliminary action prevents the device from entering endless rebooting by detecting power insufficiency early in the boot sequence, allowing automatic mode switching before full operation begins.
Solution Approach 2:
The system implements feedback by monitoring whether the device successfully completes the booting process in the second power mode. If the device reboots during the test power phase, the system detects this failure signal and automatically switches to the first power mode, using the reboot event as feedback to adjust power mode selection.
2Ease of operation
If manual web page access is used to switch power mode, then the power mode can be changed, but physical disconnection and reinstallation is required
Solution Approach 1:
The system performs automatic power mode switching without requiring user intervention. During the booting process, the device autonomously tests power supply capability, detects insufficient power conditions, and automatically switches from the second power mode to the first power mode, eliminating the need for manual web page access and physical reconnection operations.
Solution Approach 2:
The power mode switching action is performed preliminarily during the booting process itself, before the device fully operates. This preliminary automatic switching eliminates the need for post-installation manual configuration and physical disconnection, saving installation time.
3Ease of operation
If a PoE++ switch is temporarily connected to resolve the issue, then the device can boot and access web page, but expensive equipment and physical disconnection is required
Solution Approach 1:
The device autonomously handles power mode adaptation without requiring external PoE++ switch equipment or user intervention. The automatic detection and switching mechanism during booting eliminates the need for temporary expensive equipment connections and complex physical disconnection/reinstallation procedures.
Solution Approach 2:
The system performs preliminary power capability verification during the booting process itself, automatically adapting to the actual PSE power supply capability. This preliminary action eliminates the need for temporary PoE++ switch connections and complex installation procedures by resolving the power mode mismatch in-situ during initial device startup.
Data Source
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AI summary
A powered device (100) configured for Power-over-Ethernet (PoE) includes a port (170) configured to be connected to an Ethernet cable (180) through which the PoE is supplied; and a processor (160) configured to control a power mode including a first power mode and a second power mode such that the powered device (100) operates in one of the first power mode having a first power range supplied via the PoE, and the second power mode having a second power range supplied via the PoE and greater than the first power range, wherein the processor (160) is further configured to switch the power mode to the first power mode and reboot the powered device based on the powered device being booted in the second power mode and being rebooted in response to a test power being supplied during a selected period of time.