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| STANDARD | Source Voltage | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | REMARKS |
| IEEE 802.3af using data pairs |
48 V DC, protected | RX, DC+ | RX, DC+ | TX, DC- | spare | spare | TX, DC- | spare | spare | Industry Standard for embedded PoE |
| IEEE 802.3af using spare pairs |
48 V DC, protected | RX | RX | TX | DC+ | DC+ | TX | DC- | DC- | Industry Standard for embedded PoE |
| Intel, Symbol, Orinoco | Usually 12 or 24 V DC |
RX | RX | TX | DC+ | DC+ | TX | DC- | DC- | Most Brands of PoE |
| Cisco (OLD old standard) |
48 V DC | RX | RX | TX | DC- | DC- | TX | DC+ | DC+ | Older Cisco polarity is REVERSED |
| Cisco (NEW old standard) |
48 V DC | RX | RX | TX | DC+ | DC+ | TX | DC- | DC- | New Cisco is IEEE compliant |