PoE Hat ALLNET for Radxa Rock 3A 802.3at — power-over-Ethernet accessory

PoE Hat ALLNET for Radxa Rock 3A 802.3at — power-over-Ethernet accessory enables the Radxa Rock 3A single-board computer to receive power directly from an IEEE 802.3at-compliant Power over Ethernet source. The accessory is designed to attach to the Radxa Rock 3A and convert PoE input into the appropriate DC supply for the board, allowing deployment in locations where a local DC adapter is impractical. Its use of standardized PoE simplifies cabling and centralizes power management for remote or embedded installations such as kiosks, networked sensors, or compact industrial controllers.

Advantages

This PoE Hat provides a straightforward method to power the Radxa Rock 3A over existing Ethernet infrastructure, reducing the need for separate power cabling. The device follows the 802.3at power class, offering compatibility with a wide range of PoE switches and injectors. Its compact design integrates with the Radxa board footprint to preserve access to interfaces while delivering stable DC conversion and short-distance power distribution. The accessory helps decrease installation complexity and supports centralized power control for multiple distributed units.

Suitable for

• Deployments where AC/DC adapters are inconvenient or unavailable
• Networked kiosks, digital signage, and information terminals
• Embedded systems, industrial controllers, and IoT gateways
• Remote or distributed installations requiring centralized power management

Key specifications

• PoE standard: IEEE 802.3at (PoE+)
• Input method: Power delivered via Ethernet cabling (PoE injector or switch)
• Output: DC power converted and delivered to Radxa Rock 3A power input
• Form factor: Add-on hat designed to attach to Radxa Rock 3A single-board computer
• Protection features: Overcurrent and short-circuit protection (functional safety features for reliable operation)

How to use

Mount the PoE Hat onto the Radxa Rock 3A according to the board and accessory alignment, ensuring connectors are fully seated. Connect the Ethernet cable from an 802.3at-capable PoE switch or injector to the board’s network port; the PoE Hat will extract power from the Ethernet connection and provide the appropriate DC supply to the Rock 3A. Verify that the PoE source can supply sufficient power for the board and any attached peripherals. After connection, power status indicators on the Radxa board and the network equipment will show active power delivery.

Recommendations

Use an IEEE 802.3at-compliant switch or injector rated for the combined power draw of the Radxa Rock 3A and connected devices. Install cabling according to network installation best practices to maintain signal integrity and ensure reliable PoE delivery. For installations in electrically noisy or industrial environments, consider shielded cabling and proper grounding. Check thermal conditions around the HAT and the board when placed in enclosed or densely packed enclosures.