You can bridge a PoE switch to remote devices using either PoE passthrough or a wireless PoE bridge like the UniFi Device Bridge.

Using PoE Passthrough

Some PoE devices, such as Ubiquiti airMAX M radios, support PoE passthrough, allowing power and data to pass from the main PoE switch port to a secondary device. To enable this, you activate the secondary Ethernet port in the device's configuration console (airOS AC or M) and ensure PoE passthrough is enabled. This setup allows a second device to receive both power and network connectivity without additional cabling. It is recommended to use a higher-wattage PoE supply (e.g., 24W) to ensure sufficient power for the downstream device .

Wireless PoE Bridges

When running Ethernet cables is impractical, a wireless PoE bridge can connect devices to a PoE switch over Wi-Fi. The UniFi Device Bridge (UDB) family provides this functionality by converting a Wi-Fi signal into a wired Ethernet connection while supplying PoE power. The base UDB model delivers up to 15W of PoE, suitable for devices like 2K HD cameras or VoIP phones, while higher-end models like the UDB Switch support Wi-Fi 7 uplinks and multiple Multi-Gig PoE+ ports for more demanding devices .

Key Features of Wireless PoE Bridges

• Power Delivery: Provides PoE to connected devices, eliminating the need for separate power cables.
• Wi-Fi Uplink: Connects to your existing Wi-Fi network, extending network reach to remote locations.
• Device Compatibility: Works with cameras, phones, and IoT devices; higher-wattage models support PoE+ devices.
• Deployment Flexibility: Ideal for outdoor or hard-to-wire areas, reducing installation costs and complexity .

Practical Considerations

• Power Budget: Ensure the PoE switch or bridge can supply enough power for all connected devices. Standard PoE provides up to 15.4W per port, PoE+ up to 30W, and PoE++/PoE4 up to 60–90W .
• Distance Limitations: Ethernet cables typically support PoE up to 100 meters; wireless bridges can extend connectivity beyond this range without additional cabling.
• Device Standards: Verify that your devices and switch support compatible PoE standards (IEEE 802.3af, 802.3at, or 802.3bt) to avoid underpowering or connectivity issues . By combining PoE passthrough or wireless PoE bridges with a PoE switch, you can efficiently power and network devices in locations where running Ethernet cables is difficult, while maintaining flexibility and reducing installation costs.