| Property |
802.3af (802.3at Type 1) |
802.3at Type 2 |
| Power available at PD[note 1] |
12.95 W |
25.50 W |
| Maximum power delivered by PSE |
15.40 W |
34.20 W |
| Voltage range (at PSE) |
44.0–57.0 V[16] |
50.0–57.0 V[16] |
| Voltage range (at PD) |
37.0–57.0 V[17] |
42.5–57.0 V[17] |
| Maximum current |
350 mA[18] |
600 mA[18] per mode |
| Maximum cable resistance |
20 Ω (Category 3) |
12.5 Ω (Category 5) |
| Power management |
Three power class levels negotiated at initial connection |
Four power class levels negotiated at initial connection or 0.1 W steps negotiated continuously |
| Derating of maximum cable ambient operating temperature |
None |
5°C with one mode (two pairs) active |
| Supported cabling |
Category 3 and Category 5[1] |
Category 5[1][note 2] |
| Supported modes |
Mode A (endspan), Mode B (midspan) |
Mode A, Mode B |
