Table 22. Mdi And Mdi-X Pin Signals (1000Base-T) - Allied Telesis AT-CM20x Series Reference Manual

Appendix A: Technical Specifications
Table 22 lists the RJ-45 pin signals for the 10/100/1000-Base-T port on
the AT-CM2K0S line card when it is operating at 1000 Mbps.

Table 22. MDI and MDI-X Pin Signals (1000Base-T)

MDI Configuration
Pinout
1
2
3
4
5
6
7
8
MDI-X Configuration
Pair Pinout
Pair 1 + 1
Pair 1 - 2
Pair 2 + 3
Pair 3 + 4
Pair 3 - 5
Pair 2 - 6
Pair 4 + 7
Pair 4 - 8
Pair
Pair 2 +
Pair 2 -
Pair 1 +
Pair 4 +
Pair 4 -
Pair 1 -
Pair 3 +
Pair 3 -
90