Ethernet RJ45 Pinouts
Page last updated 30 Jan 2011, by 
Bruce D Lightner.
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Bruce D Lightner.
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replies
Appendix B: Port Assignments
RJ-45 Port
Figure B.1 RJ-45 Connector (on the Hub Side)
Pin
MDI-X Assignment (Port 1-8)
MDI Assignment (Cascade Port 8)
1
Receive Data +
Transmit Data +
2
Receive data Transmit
Data 3
Transmit Data +
Receive Data +
6
Transmit Data Receive
data 4,5,7,8
Not Used
Not Used
Table B.1 RJ-45 Pin Assignments
Schematics for both straight and crossover twisted-pair cable are shown below.
Straight-Through Crossover
(Hub) (Adapter) (Hub) (Hub) 1 IRD+ 1 OTD+ 2 IRD1
OTD+ 1 IRD+
2 OTD-
3 OTD+
2 OTD-2 IRD3
IRD+
6 OTD-
3 IRD+ 3 OTD+
6 IRD- 6 OTD- 6 IRD-
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