User guide

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B-1

Compaq Netelligent 1009B 10Base-T Hub User Guide

Writer:

Chris Seiter

Project:

Appendix B: Port and Cable Pin Assignments

Comments:

File Name:

1009B_B.DOC

Last Saved On:

6/26/97 2:21 PM

Appendix B

Port and Cable Pin Assignments

Figure B-1

. RJ-45 Connector (hub side)

Pin MDI-X Assignment

(Port 1 ~ 8)

MDI Assignment

(UPLINK Port)

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-