Compaq NC7131 Gigabit Server Adapter User Guide

C-4 Compaq NC7131 Gigabit Server Adapter User Guide
Figure C-2 shows the correct 10/100 wiring to use when the crossover function is implemented
externally in the twisted-pair cabling.
1
2
3
4
5
6
7
8
White/Orange
Orange/White
White/Green
Green/White
Figure C-2. 10/100 external crossover for RJ-45 connector
Gigabit over Copper Internal Straight-Through Pinouts
Unlike connections in which the crossover function is implemented internally at the hub or
switch, the NC7131 adapter provides its own automatic crossover function. This means you can
wire twisted-pair media straight-through for adapter-to-hub, adapter-to-switch, or adapter-to-
adapter connections using the pinouts shown in Table C-4.
NOTE: To operate at Gigabit speeds, all four pairs of wires must be terminated within the RJ-45
connector.
Table C-4
Gigabit over Copper Pinouts Using Internal Crossover
Pin Function Color Match Function Pin
1 BI_DA+ White/Orange BI_DA+ 1
2 BI_DA- Orange/White BI_DA- 2
3 BI_DB+ White/Green BI_DB+ 3
4 BI_DC+ Blue/White BI_DC+ 4
5 BI_DC- White/Blue BI_DC- 5
6 BI_DB- Green/White BI_DB- 6
7 BI_DD+ White/Brown BI_DD+ 7
8 BI_DD- Brown/White BI_DD- 8