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Appendix B: Pin Assignments
RJ-45 Port
Hub
Figure B.1
RJ-45 Connector
(on the Hub Side)
Cable
RJ-45 station ports (MDI-X) can be attached to any devices that
use a standard network interface (e.g., a workstation or server).
RJ-45 cascade ports (MDI) can be cascaded to a station port on
similar networking devices (e.g., another switch or router). Use
unshielded twisted-pair (UTP) or shielded twisted-pair (STP)
cable for RJ-45 connections: 100W Category 3, 4 or 5 cable for
10 Mbit/s connections or 100W Category 5 cable for 100
Mbit/s connections. Also be sure that the length of any twistedpair connection does not exceed 100 meters.
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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
2
3
6
1
2
3
6
1
2
3
6
1
2
3
6
Pin Assignments
B-1