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What does PoE power supply mean? Why does a surveillance camera need just one network cable without a power outlet? I measured it with a multimeter, and the non-standard PoE pitfall really burned the network card
PoE means you can transmit both data and power through a network cable, so you can pull a camera cable over without leaving a socket. I measured the PoE port of my switch with a multimeter and finally figured it out: standard PoE doesn't output power without a handshake, and the air port only fluctuates a few volts; A non-standard PoE port on Taobao costs just a few dozen yuan, and the port is always 48V. Plugging in a regular device burns the network card. A sixfold difference in standard power for the third generation, how to calculate the total budget, and where the red line is located—all explained in detail....
