Appendix A: RJ-45 Pin Assignment

10/100Mbps, 10/100Base-TX

When connecting your 10/100Mbps Ethernet Switch to another switch, a bridge or a hub, a straight or crossover cable is necessary. Each port of the Switch supports auto-MDI/MDI-X detection. That means you can directly connect the Switch to any Ethernet devices without making a crossover cable. The following table and diagram show the standard RJ-45 receptacle/ connector and their pin assignments:

RJ-45 Connector pin assignment

 

Contact

MDI

MDI-X

 

 

 

Media Dependant Interface

Media Dependant Interface-Cross

 

 

1

Tx + (transmit)

Rx + (receive)

 

 

 

 

 

 

 

2

Tx - (transmit)

Rx - (receive)

 

 

 

 

 

 

 

3

Rx + (receive)

Tx + (transmit)

 

 

 

 

 

 

 

4, 5

Not used

 

 

 

 

 

 

 

 

6

Rx - (receive)

Tx - (transmit)

 

 

 

 

 

 

 

7, 8

Not used

 

 

 

 

 

 

 

The standard cable, RJ-45 pin assignment

1 2 3 4 5 6 7 8

8 7 6 5 4 3 2 1

The standard RJ-45 receptacle/connector

There are 8 wires on a standard UTP/STP cable and each wire is color-coded. The following shows the pin allocation and color of straight cable and crossover cable connection:

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GE-DS-82 and 82-PoE Ethernet Managed Switch User Manual

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GE GE-DS-82, 82-POE user manual 10/100Mbps, 10/100Base-TX, Standard cable, RJ-45 pin assignment