Straight Through
Cable

RJ-45
PIN

1 Tx+

1 Rc+

2 Tx-

2 Rc-

3 Rc+

3 Tx+

6 Rc-

6 Tx-

Crossover
Cable

RJ-45
PIN

1 Rx+

3 Tx+

2 Rc-

6 Tx-

3 Tx+

1 Rc+

6 Tx-

2 Rc-

Pin #

Signal

EIA/TIA 568A

AT&T 258A, or EIA/TIA 568B

Ethernet 10BASE-T
100BASE-T

1

Transmit+

White/Green

White/Orange

X

2

Transmit-

Green/White
or Green

Orange/White
or Orange

X

3

Receive+

White/Orange

White/Green

X

4

N/A

Blue/White
or Blue

Blue/White
or Blue

Not used *

5

N/A

White/Blue

White/Blue

Not used *

6

Receive-

Orange/White
or Orange

Green/White
or Green

X

7

N/A

White/Brown

White/Brown

Not used *

8

N/A

Brown/White
or Brown

Brown/White
or Brown

Not used *