SMC Networks SMC7500A/VCP - Manual (Page 28)

T
ROUBLESHOOTING
16
connected straight through to pins 1, 2, 3, and 6 at the other end of the
cable.
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 two pairs of wires must be
straight-through.
Pin MDI-X Signal
Name
MDI Signal Name
1 Receive Data plus
(RD+)
Transmit Data plus (TD+)
2 Receive Data minus
(RD-)
Transmit Data minus (TD-)
3 Transmit Data plus
(TD+)
Receive Data plus (RD+)
6 Transmit Data
minus (TD-)
Receive Data minus (RD-)
4,5,7,8 Not used Not used
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-)