@woozle Thanks for the great reply. I have measured the voltage at the end of the cable at 11.5 on the stock adapter and 11.9 on another but I suppose it drops to what you suggest when drawing...

I was planning to extend my network to the shed using 50m of Cat5e cable with a pair of Lindy Passive Power over Ethernet adapters for power but the AX23 is not powering up, seemingly because the...