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B-3
Compaq HB1004 10Base-T Ethernet Hub
Writer:
Weldon W. Rowan
Project:
Troubleshooting
Comments:
File Name:
SAB_B.DOC
Last Saved On:
7/2/98 2:37 PM
Table B-2
RJ-45 Port Pin Assignments
Pin Assignment
(Hub Ports 1 – 4)
Assignment
(MDI/MDI-X Port, other Device)
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
Twisted Pair Cable
Figure B-1 shows the wiring for Straight-Through and Crossover twisted-pair
cable.
Straight-Through
1 IRD+
2 IRD-
3 OTD+
6 OTD-
1 OTD+
2 OTD-
3 IRD+
6 IRD-
(Hub)
(Adapter)
Crossover
1 IRD+
2 IRD-
3 OTD+
6 OTD-
(Hub)
(Hub)
1 IRD+
2 IRD-
3 OTD+
6 OTD-
Figure B-1 Straight-through and Crossover UTP cables