it only works well if the plugs you’re connecting are on the same electrical network, as transversing coils isn’t exactly great for high frequency signals.
What does “electrical network” mean? Panel? Circuit?
If two plugs are connected to different circuit breakers, then they’re in different “electrical networks” in this sense: basically for a signal to go from one such plug to the other one it has to transverse both circuit breakers and that means going through coils.
Coils are inductors, which are electrical elements which have have frequency dependent resistance (in simple terms), with the higher the frequency of a signal the more the resistance they offer to the passing of a signal, and the higher the bandwidth of your data connection the higher the frequency of the signal(s) necessary to transport that data.
What does “electrical network” mean? Panel? Circuit?
If two plugs are connected to different circuit breakers, then they’re in different “electrical networks” in this sense: basically for a signal to go from one such plug to the other one it has to transverse both circuit breakers and that means going through coils.
Coils are inductors, which are electrical elements which have have frequency dependent resistance (in simple terms), with the higher the frequency of a signal the more the resistance they offer to the passing of a signal, and the higher the bandwidth of your data connection the higher the frequency of the signal(s) necessary to transport that data.