yes, remember the etherdongles output is like a lynx combiner, it is sending out 4 data streams, on 4 pairs of wires.
Your hub jumpers will tell that hub what data pair to listen to. The input has all 4 pairs, and the chaining output has all 4 pairs going out as well.
so a etherdongle can handle 4 hubs without duplicating channels.
Myk