SMC Networks SMC8011CM manual Straight-Through Cable, Crossover Cable

PORT AND CABLE ASSIGNMENTS

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.

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 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.

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-)

24