SMC Networks 7904WBRA-N User Manual page 124

Pin Assignments
With 100BASE-TX/10BASE-T cable, pins 1 and 2 are used for
transmitting data, and pins 3 and 6 for receiving data.
Pin Number
1
2
3
6
1: The "+" and "-" signs represent the polarity of the wires
that make up each wire pair.
Straight-Through Wiring
If the port on the attached device has internal crossover wiring (MDI-X),
then use straight-through cable.
Straight-Through Cable Pin Assignments
End 1
1 (Tx+)
2 (Tx-)
3 (Rx+)
6 (Rx-)
RJ-45 Pin Assignments
Assignment
Tx+
Tx-
Rx+
Rx-
End 2
1 (Tx+)
2 (Tx-)
3 (Rx+)
6 (Rx-)
1
B-3
E C
THERNET ABLE