I have a question regarding magnetics topology on an ethernet 1000base t channel. I'm working on a project where I have a board (board 1) with MAC, PHY, and magnetics.
I have another board that mates to this (board 2) through a board-to-board connector. On "board 2" i'm taking the ethernet channels (4 differential pairs per channel) and routing them to RJ-45's with built-in magnetics. Then from the RJ-45's with built-in magnetics, the ethernet goes through standard cabling to an ethernet port on a PC (with built-in magnetics). So, if we follow the ethernet channel it goes
board 1 -> magnetics -> board 2 -> magnetics -> CABLE -> magnetics -> PC
Will 3 magnetics cause noise/oscillation or disturb ideal impedance matching?
A typical LAN has 2 magnetics per ethernet channel. I haven't found any resources on multiple (more than 2) magnetics circuits on a given ethernet channel.