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B-4 © 2003 Foundry Networks, Inc. February 2003
Straight-Through Wiring
If the twisted-pair cable is to join two ports and only one of the
ports has an internal crossover (MDI-X), the two pairs of wires
must be straight-through.
Crossover Wiring
If the twisted-pair cable is to join two ports and either both ports
are labeled with an “X” (MDI-X) or neither port is labeled with an
“X” (MDI), a crossover must be implemented in the wiring.
Straight-Through RJ-45 Pin As-
signments
End 1 End 2
1 (RD+) 1 (TD+)
2 (RD-) 2 (TD-)
3 (TD+) 3 (RD+)
6 (TD-) 6 (RD-)
Crossover RJ-45 Pin Assign-
ments
End 1 End 2
1 (TD+) 3 (RD+)
2 (TD-) 6 (RD-)
3 (RD+) 1 (TD+)
6 (RD-) 2 (TD-)