I am adding a optional LED SMD indication for signals. Which is a SMD LED behind the jack on the backside of the PCB.  I got the idea from benjiaomodular Mini DIV. Benjiaomodular Project The LEDs will tell the user what channels are being used when unplugged. I think it is a very good idea. The module will still be passive getting lit by the sent voltages over Rj45 connector. When Plugged into the jack it will disconnect the LED So there wont be any voltage drop with the LED.