PLC data transmition (on top of Wi-Fi to optimize audio signal)

[Zlatko]

Hi,

I have a two silver Phantoms and dialog which is connected on apple last generation time capsule.

After the last update I found out in the Spark app that one from the Phantoms it is connected to the 
Dialog through PLC and the other phantom on wifi 2,4 GHz? There is no difference in the sound quality .

How to change this future? What is exactly PLC???