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B-1
Appendix B:
Port and Cable Assignments
RJ-45 Port
Figure B-1 RJ-45 Connector (on the Hub Side)
Pin
MDI-X Assignment
Station Port 1 ~ 2
MDI Assignment
Cascade Port 1 ~ 2
1 Input Receive Data + Output Transmit Data +
2 Input Receive Data - Output Transmit Data -
3 Output Transmit Data + Input Receive Data +
6 Output Transmit Data - Input 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+ 1 IRD+ 1 IRD+
2 IRD- 2 OTD- 2 IRD- 2 IRD-
3 OTD+ 3 IRD+ 3 OTD+ 3 OTD+
6 OTD- 6 IRD- 6 OTD- 6 OTD-