The connector J6 is pinned out as below - VCC3V3 2 1 nc VCC3V3 4 3 nc VCC3V3 6 5 nc VCC3V3 8 7 nc VCC5V0 10 9 TXP VCC5V0 12 11 TXN VCC5V0 14 13 nc nc 16 15 nc VSS 18 17 RXP VSS 20 19 RXN nc = not connected. Pin 1 is indicated by the 45 degree chamfer on the silkscreen of J6. Note the 'odd' layout of this connector. Pin 1 is at the top RHS, not the top LHS as is more usual. I don't know why! One thing to perhaps note is that the signals TXP,TXN,RXP,RXN are straight from the Ethernet PHY and not via any magnetics. These are not the same signals that appear on the output of the Ethernet RJ45 connector, J9 which go through magnetics contained within the RJ45.