75
APPENDIX A NETWORKING CONNECTION
A.1 Switch
‘
s RJ-45 Pin Assignments
1000Mbps, 1000Base T
Contact
MDI
MDI-X
1
BI_DA+
BI_DB+
2
BI_DA-
BI_DB-
3
BI_DB+
BI_DA+
4
BI_DC+
BI_DD+
5
BI_DC-
BI_DD-
6
BI_DB-
BI_DA-
7
BI_DD+
BI_DC+
8
BI_DD-
BI_DC-
Implicit implementation of the crossover function within a twisted-pair cable, or at a wiring panel,
while not expressly forbidden, is beyond the scope of this standard.
A.2 10/100Mbps, 10/100Base-TX
Contact
MDI
MDI-X
1
1
3
2
2
6
3
3
1
6
6
2
A.3 RJ-45 cable pin assignment
2 1
3
6
1
2
3
6
2 1
3
6
There are 8 wires on a standard UTP/STP cable and each wire is color-coded. The following shows the
pin allocation and color of straight cable and crossover cable connection:
