HP NC3122 Fast Ethernet Server Adapter - Manual (Page 19)

Specifications C-3
Figure C-1 shows straight-through connector wiring to be used when the crossover function is
implemented within the hub/switch.
Figure C-1. 10/100 straight-through wiring for RJ-45 connector
10/100 Crossover Pinouts
When the crossover function is not provided within the hub/switch, you must implement the
crossover through the twisted-pair media using the physical pinouts indicated in Table C-3.
Table C-3
10/100 Pinouts Using External Crossover
Pin Function Color Match Function Pin
1 TD+ White/Orange RD+ 3
2 TD- Orange/White RD- 6
3 RD+ White/Green TD+ 1
4 Blue/White
5 White/Blue
6 RD- Green/White TD- 2
7 White/Brown
8 Brown/White
Figure C-2 shows the correct 10/100 wiring to use when the crossover function is implemented
externally (in the twisted-pair cabling).
Figure C-2. External crossover for RJ-45 connector