Crossover Cable Pinouts

This appendix provides the pinouts for creating a crossover cable. You must use a crossover cable to connect the bridge directly to the Ethernet port on a computer.

Table C-1 below lists the signals and pins on each end of the cable. The wire on the pin 1 location on cable end A must be connected to the pin 3 location on cable end B, and so on. Figure C-1 below shows the pin numbering on an RJ-45 connector.

Cable End A	Cable End B
Signal	Pin	Pin	Signal
Tx+	1	3	Rx+
Tx-	2	6	Rx-
Rx+	3	1	Tx+
-	4	4	-
-	5	5	-
Rx-	6	2	Tx-
-	7	7	-
-	8	8	-

Table C-1:

Cable End A Cable End B

Signal Pin Pin Signal

Tx+

1

3

Rx+

Tx-

2

6

Rx-

Rx+

3

1

Tx+

-

4

4

-

-

5

5

-

Rx-

6

2

Tx-

-

7

7

-

-

8

8

-

Pinouts for a Crossover Cable

Note Pins 3 and 6 at cable end A must be a twisted pair wired through to pins 1 and 2, respectively, at B.
Pins 1 and 2 at cable end B must be a twisted pair wired through to pins 3 and 6, respectively, at cable end A.
Pins 4, 5, 7, and 8 are not used in this application, although they may be wired in the cable.

Figure C-1: Pin Numbering on an RJ-45 Connector

Table of Contents

Crossover Cable Pinouts

Crossover Cable Pinouts