The powerline ethernet adapter I am talking about is this one
https://www.amazon.com/TP-Link-Powerline-ethernet-Adapter-TL-PA4010KIT/dp/B00AWRUICG/ref=sr_1_3?s=electronics&ie=UTF8&qid=1530739096&sr=1-3&keywords=powerline%2Bethernet%2Badapter&th=1
What I don't understand is how this adapter...