Appendix A: Technical Specifications
Table 13. 10/100Base-T Port MDI/MDI-X Pin Signals with PoE
Pin | MDI Signal | MDI-X Signal |
| | |
| | |
4 | Unused | Unused |
| | |
5 | Unused | Unused |
| | |
6 | RX- and Vport-2 | TX- and Vport-2 |
| | |
7 | Unused | Unused |
| | |
8 | Unused | Unused |
| | |
1.Vport-1 can be positive (+) or negative (-), depend- ing on the requirements of the powered device con- nected to a port.
2.Vport-2 can be positive (+) or negative (-), depend- ing on the requirements of the powered device con- nected to a port. If Vport-1 is positive, then Vport-2 will be negative. If Vport-1 is negative, then Vport-2 will be positive.
Table 14 lists the RJ-45 pin signals for the two 10/100/1000-Base-T ports on the AT-8550GB switch when the ports are operating at 1000 Mbps.
Table 14. MDI and MDI-X Pin Signals (1000Base-T)
MDI Configuration | MDI-X Configuration |
| | | | | |
Pinout | Pair | | Pinout | Pair | |
| | | |
| | | |
1 | Pair 1 + | 1 | Pair 2 + |
| | | |
2 | Pair 1 - | 2 | Pair 2 - |
| | | |
3 | Pair 2 + | 3 | Pair 1 + |
| | | |
4 | Pair 3 + | 4 | Pair 4 + |
| | | |
5 | Pair 3 - | 5 | Pair 4 - |
| | | | | |
6 | Pair 2 | - | 6 | Pair 1 | - |
| | | | | |
7 | Pair 4 | + | 7 | Pair 3 | + |
| | | | | |
8 | Pair 4 | - | 8 | Pair 3 | - |
| | | | | |
