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SQID RJ-45 Connector and Pinouts

  


Pin
In
Out
Color
Standard pinout
(NIC=MDI)
Crossover pinout
(HUB=MDI-X)
100BaseT
Cable
1
Transmit + Receive + orange/white
2
Transmit - Receive - orange
3
Receive + Transmit + green/white
4
UUP1 + UUP1 + blue
5
UUP1 - UUP1 - blue/white
6
Receive - Transmit - green
7
UUP2 + UUP2 + brown/white
8
UUP2 - UUP2 - brown
-
SHLD SHLD  

UUP1 and UUP2 are "unused pair" 1 and 2. When using a standard CAT5 cable, these pairs are connected to the two unused pairs in the 4 pair (8 wire) cable.

NOTE: Standard CAT5 design practice is to terminate these pairs on the PCB to reduce noise. When using a 2 pair cable, these pins are left unconnected in the cable.

 

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