SMC Networks SMC8011CM - Manual (Page 32)

P
ORT AND
C
ABLE
A
SSIGNMENTS
24
Straight-Through Cable
If the twisted-pair cable is to join two ports and only one of the ports has
an internal crossover (MDI-X), the cable used must be straight-through.
Crossover Cable
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 Assignments
End 1 End 2
1 (RD+) 1 (TD+)
2 (RD-) 2 (TD-)
3 (TD+) 3 (RD+)
6 (TD-) 6 (RD-)
Crossover RJ-45 Pin Assignments
End 1 End 2
1 (TD+) 3 (RD+)
2 (TD-) 6 (RD-)
3 (RD+) 1 (TD+)
6 (RD-) 2 (TD-)