Hello, I have seen in several layout guidelines that the Ethernet transformer should be placed as close to the RJ-45 connector as possible, while the close placement of a PHY to the transformer is not as critical. Why is that? It seems counter-intuitive: I would think that the PHY should as close to the transformer as possible, while the lines between the transformer and the RJ-45 are just differential pairs and, thus, are not much different from the CAT5 cable. So, why is the close placement of the transformer to the RJ-45 is more critical than the close placement of the PHY to the transformer?
Thank you, Eric.