A:Answer Not 100% sure on the meaning of the question. I am guessing that you are asking if simply by putting an ethernet device into one of these that the speed drops? The short answer is "no." One has to think a bit on how this works. All this is doing, with two of these, is creating the equivelant of ONE WIRE from point A to B.
My hookup is using 3 of these. One plugs into a cable modem/router. 2nd plugs into a SWITCH (think "router" but slightly different), the third Plugs into a ROUTER. Thus at the SWITCH I can plug in up to 24 different devices. At the 2nd router I can plug in another 4 devices, plus the second router acts like a WiFi hotspot for the media room, which is completely across the house from the main house. Thus, I have effectively about a dozen devices plugged into three of these. If only 1 is active, I am going to get the full cable/modem speed. But of course if two computers are using the internet at the same time, the "speed" for each them HAS TO drop. The total coming from you cable modem is always a total and the devices all share that total.
These devices are simply converting your cable wire into an ethernet wire (effectively).
