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December 18, 2023

Active PoE power adapter VS Passive PoE power adapter

Devices that comply with PoE industry standards (IEEE802.3af, IEEE802.3at, IEEE802.3bt standards) are PoE power adapter and if you want to use the product,the negotiation can only be successful when the devices at both ends comply with the same standard mode.In addition,Active PoE power adapter strictly requires that the power supply equipment (PSE) must have the functions of the PSE intelligent detection chip to detect terminals, classify equipment, and evaluate power loss. PoE power supply equipment (PSE) and powered equipment (PD) Negotiation will be automatically performed when connecting. Only after the negotiation between the devices at both ends is successful, the power supply equipment (PSE) will provide power to the powered device (PD). In the working mode of this standard PoE technology, the security of PoE equipment can be effectively guaranteed.


Industrial Fiber optic PoE power injector


Passive PoE power adapter usually refers to equipment that does not comply with PoE industry standards (IEEE802.3af, IEEE802.3at, IEEE802.3bt power supply standards). Non-standard products do not detect and judge the powered device (PD). Direct power supply, no handshake protocol process, simple and crude use of the power in the network cable, no matter whether the powered device (PD) supports PoE or not, it will be powered. The harm of Passive PoE power adapter is that the voltage is unstable and operates under under-voltage or over-voltage conditions, resulting in shortened working life of the powered device (PD), equipment burnout, electric shock, aging lines, water leakage, short circuits and other safety hazards.


PoE injector diagram

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