Allied Telesis AT-8550SP - Manual (Page 84)

Technical Specifications
84
Table 11 lists the RJ-45 port pin signals on the 10/100Base-TX ports on an
AT-8524POE switch.
Table 11 10/100Base-T Port MDI/MDI-X Pin Signals with PoE
Pin MDI Signal MDI-X Signal
1 TX+ and Vport-1
1
1. Vport-1 can be positive (+) or negative (-), depending
on the requirements of the powered device connected
to a port.
RX+ and Vport-1
2 TX- and Vport-1 RX- and Vport-1
3 RX+ and Vport-2
2
2. Vport-2 can be positive (+) or negative (-), depending
on the requirements of the powered device connected
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.
TX+ and Vport-2
4 Unused Unused
5 Unused Unused
6 RX- and Vport-2 TX- and Vport-2
7 Unused Unused
8 Unused Unused