TP-Link Switch PoE Voltage
TP-Link PoE switches typically deliver 48V DC for standard PoE (802.3af/at) and may use 24V or 48V for passive PoE, depending on the model.
Standard PoE (IEEE 802.3af/at/PoE+)
TP-Link switches that comply with IEEE 802.3af (PoE) or 802.3at (PoE+) standards provide 48V DC over Ethernet cables. The power delivered per port varies by standard:
- 802.3af (PoE): up to 15.4W per port
- 802.3at (PoE+): up to 30W per port
- 802.3bt (PoE++): up to 60W (Type 3) or 100W (Type 4) per port These switches automatically negotiate with powered devices (PDs) to ensure safe and compatible power delivery, preventing damage to non-PoE devices . For example, the TL-SG105PE supports up to 30W per PoE port with a total PoE budget of 65W for its 4 PoE+ ports .
Passive PoE
Some TP-Link devices use passive PoE, which does not follow IEEE standards. Passive PoE delivers a fixed voltage, commonly 9V, 12V, 24V, or 48V, without negotiation with the powered device . This method requires a dedicated passive PoE injector or adapter and is not compatible with standard PoE switches. Cable length limitations also apply: indoor devices typically support up to 30 meters, while outdoor devices can reach up to 60 meters .
Practical Notes
- Ensure the switch's input voltage matches the power source to avoid issues .
- Managed or Easy Smart PoE switches allow enabling/disabling PoE per port via the web interface, while unmanaged switches cannot .
- Total PoE power consumption is monitored; if exceeded, lower-priority ports may have power reduced to protect the switch . In summary, most TP-Link PoE switches use 48V DC for standard PoE, while passive PoE models may use 24V or other fixed voltages, and compatibility depends on the device and PoE standard.
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