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PoE PSE Media Converters, 10/100/1000BASE-T to 1000BASE-SX/LX
3.2 PoE Endpoint RJ-45 Pin Assignment
IEEE 802.3af assigns pairs on the RJ-45 connector of the CAT5 cable as shown in Figure 3-2.
Endpoint: -48V via twisted-pair Pins 1, 2, 3, 6.
Figure 3-2. Endpoint PSE RJ-45 male connector.