SMSC SMC6516TF - Manual (Page 103)

Straight-Through Wiring
If the twisted-pair link segment is to join two ports and only
one of the ports has an internal crossover, the two pairs of
wires must be straight-through.
Crossover Wiring
If the twisted-pair link segment is to join two ports and either
both ports are labeled with an “x” or neither port is labeled
with an “x,” a crossover must be implemented in the wiring.
A-4
C
ABLES
End 1 End 2
1 (Tx+) 1 (Tx+)
2 (Tx-) 2 (Tx-)
3 (Rx+) 3 (Rx+)
6 (Rx-) 6 (Rx-)
End 1 End 2
1 (Tx+) 3 (Rx+)
2 (Tx-) 6 (Rx-)
3 (Rx+) 1 (Tx+)
6 (Rx-) 2 (Tx-)
Crossover RJ-45 Pin Assignments
Straight-Through RJ-45 Pin Assignments