What power over Ethernet (PoE) device uses the injected DC voltage from the injector?

The correct answer is that a DC picker or tap is a device that utilizes the injected DC voltage from a Power over Ethernet (PoE) injector. In a PoE system, power is delivered over the same cable that transmits data, enabling devices to receive power without needing a separate electrical connection.

A DC picker or tap is specifically designed to extract or "tap" that injected DC voltage from the Ethernet cable, providing the necessary power to various devices without the need for additional wiring for electricity. This makes it highly efficient in installations where power sources might be limited or where cabling could become cumbersome.

Other options such as a bandwidth control unit (BCU), a network switch, and an access point (AP) can be involved in network operations or power delivery in a PoE setup, but they do not specifically function by directly utilizing the injected DC voltage in the same manner as a DC picker or tap. The BCU primarily manages network traffic and bandwidth, network switches facilitate data transmission between devices, and access points allow wireless devices to connect to the network, but they rely on the power they receive rather than extracting it directly as the DC picker does.