RJ-45 Connector pin assignment

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MDI

 

MDI-X

 

Media Dependant

 

Media Dependant

 

Interface

 

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

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: