802.3bt

  The maximum power that Power over Ethernet (PoE) can provide depends on the specific PoE standard being used. The latest standard offers significantly higher power compared to earlier versions. Here’s a breakdown of the power limits across different PoE standards:   1. IEEE 802.3af (PoE) Maximum Power Output (at the PSE - Power Sourcing Equipment): 15.4W per port Available Power for Devices (at the PD - Powered Device): 12.95W Use Case: Low-power devices like VoIP phones, basic IP cameras, and wireless access points.     2. IEEE 802.3at (PoE+, PoE Plus) Maximum Power Output: 30W per port Available Power for Devices: 25.5W Use Case: Medium-power devices such as PTZ (Pan-Tilt-Zoom) cameras, advanced wireless access points, and video phones.     3. IEEE 802.3bt (PoE++, 4-Pair PoE) Type 3 (PoE++): --- Maximum Power Output: 60W per port --- Available Power for Devices: 51W --- Use Case: High-performance wireless access points, multi-stream video conferencing systems, and PTZ cameras. Type 4 (PoE++): --- Maximum Power Output: 100W per port --- Available Power for Devices: 71.3W --- Use Case: Power-hungry devices such as digital signage, LED lighting, building automation, smart lighting systems, and large PoE devices.     Summary of Maximum Power Output: PoE Standard Maximum Power Output (PSE) Available Power for Devices (PD) Use Case IEEE 802.3af (PoE) 15.4W 12.95W VoIP phones, basic IP cameras IEEE 802.3at (PoE+) 30W 25.5W PTZ cameras, advanced wireless access points IEEE 802.3bt (Type 3) 60W 51W High-end WAPs, PTZ cameras, conferencing IEEE 802.3bt (Type 4) 100W 71.3W Digital signage, smart lighting, high-power devices   Maximum Power Delivery: The highest PoE power delivery is through IEEE 802.3bt (Type 4), which can provide up to 100W at the power source and 71.3W at the device.   For most applications requiring high power, PoE++ (802.3bt Type 3 or 4) is the standard used. This enables powering larger devices such as high-performance wireless access points, smart lighting systems, and large displays or signage without requiring a separate power source.