It's a good question. Do you figure it out? Could you share your experience to us when I also prepare to use this function?

Are your EAP and Controller in the same subnet? Error "time out" also could be incorrect username and password. You can try to login in the EAP without using Controller to make sure you hava the...

48 volts is too high for it. 24V is also not a good choice. 12V is better that all of that.

We can see the External Power Supply is 9VDC/0.85A from TP-LINK official website. So the highest voltage I think is 12V. If you are afraid about it, just use 9V.

Which mean that after you shut off the Controller then the configuration of the EAP will be different from the Controller? And after you restart the Controller then the configuration will be same?...

Topology: Internet---AV500(upstair)---(powerline)---AV500(downstair)---TL-WA901ND)))) The configuration of AV500, it is easy and you can also see from the website. If the AV500 is working well, then...