RJ-45 Connector pin assignment
Contact
MDI
Media Dependant
Interface
MDI-X
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
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:
