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I'm talking about the LED supply. 20mA at 3V is the max any indicator LED will be powered at (a lot less these days). LEDs are current limited, so you don't get to draw more. That's 60mW. So no, not possible. Not going to draw any significant power off of the Ethernet pins either
*Maybe* if the LEDs are low side switched *and* the current limiting resistor is on the low side and you wire up yourself between anode and the connector shield you could steal more power, but that's a lot of maybes and assumptions about the board design.
Fine. I am not claiming it was done. I am saying there is a possible approach and that you forgot that the part pinout is not the same as the jack pinout.
Ethernet jacks still don't have power pins. LEDs pins are not power pins. You're not the first to bring up this idea of powering an implant off of the LED supply. It's not practical, I already considered it before your tweet.
Also, multiple jack parts have access to more led pins, so more power.
16 LEDs are still not enough to run dual 1000BASE-T PHYs + a CPU capable of using them.
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