C-8
Compaq NC3131 Fast Ethernet Server Adapter User Guide
Gigabit over Copper External Crossover Pinouts
When a crossover function is not provided by either the adapter or hub or switch, you must
implement it through the twisted-pair media using the physical pinouts shown in Table C-12.
Table C-12
Gigabit over Copper Crossover Pinouts
Pin Function Color
Match Function Pin
1 BI_DA+
White/Orange
BI_DB+ 3
2 BI_DA-
Orange/White
BI_DB- 6
3 BI_DB+
White/Green BI_DA+ 1
4 BI_DC+ Blue/White BI_DD+ 7
5 BI_DC- White/Blue BI_DD- 8
6 BI_DB-
Green/White BI_DA- 2
7 BI_DD+
White/Brown BI_DC+ 4
8 BI_DD-
Brown/White BI_DC- 5
Figure C-4 shows the correct Gigabit over copper wiring to be used when the crossover function
is implemented externally (in the twisted-pair cabling).
Figure C-4. Gigabit over copper external crossover for RJ-45 connector
