Power over Ethernet (PoE) can enable fast installation and deployment to provide maximum reliability for today’s enterprise network. PoE can be broken down into 4 main PoE types - Type 1, Type 2, Type 3 and Type 4, as per the comparison table presented below.
| Capability | PoE Type 1 | PoE Type 2 | PoE Type 3 | PoE Type 4 |
|---|---|---|---|---|
| Also known as | PoE, 2-pair PoE | PoE+,PoE Plus | 4-pair PoE, 4P PoE, PoE++, UPOE | higher power PoE, PoE+++, UPOE+ |
| Standard | IEEE802.3af | IEEE802.3at | IEEE802.3bt | IEEE802.3bt |
| PSE minimum Vout | 44V | 50V | 50V | 52V |
| PSE Polarity | Switch: Flexibility; Midspan: Fixed | Switch: Flexibility; Midspan: Fixed | Flexibility | Fixed |
| Power Delivery over 4 pairs | No | No | Class 0-4: Optional; Class 5-8: Mandatory | Mandatory |
| Extended Power | No | No | Yes | Yes |
| Low Minimum Power Signature (MPS) | No | No | Yes | Yes |
| PSE Maximum Pout | 15.4W | 30W | 60W | 90 - 99W** |
| PD Maximum Input Power | 13W | 25.5W | 51W | 68.3 - 99W** |
PSE: Power Sourcing Equipment
PD: Powered Device
** Extended capability depends on cable quality, cable length and PSE output voltage and the ability to support Auto Calss