SMC Networks SMC9462TX - Manual (Page 46)

C
ABLES
B-2
Caution: Each wire pair must be attached to the RJ-45 connectors
in a specific orientation.
Figure B-1 illustrates how the pins on the RJ-45 connector are
numbered. Be sure to hold the connectors in the same orientation
when attaching the wires to the pins.
Figure B-1. RJ-45 Connector Pin Numbers