SMC Networks 10/100 Mbps - Manual (Page 50)

C
ABLE
S
PECIFICATIONS
40
The figure below illustrates how the pins on the RJ-45 connector are
numbered. Be sure to hold the connectors in the same orientation when
attaching the wires to the pins.
With 10BASE-T/100BASE-TX cable, pins 1 and 2 are used for
transmitting data, and pins 3 and 6 for receiving data. The “+” and “-”
signs in the tables below are used to represent the polarity of the wires that
make up each wire pair.
RJ-45 Pin Assignments
Pin
Assignment
1 Tx+
2 Tx-
3 Rx+
6 Rx-