Power over Ethernet (PoE) and LV cabling requires which of the following?

• A. PoE uses alternating current over Ethernet cables for devices.
• B. PoE delivers DC power alongside data on Ethernet cables; requires PoE-capable equipment and appropriate cabling standards.
• C. PoE is only for fiber cables.
• D. PoE requires separate power cables for each device.

Answer: (B)

Power over Ethernet delivers DC power over the same copper Ethernet cable that carries data, using PoE-capable equipment to negotiate and supply power within standard limits. This means you need devices like a PoE-enabled switch or injector (PSE) and powered devices (PD) that the standards support, plus cabling such as Cat5e/6/6a that is rated for PoE. The power and data travel together on the Ethernet pair, so no separate power cable is needed for each device. It’s not about alternating current, and it isn’t limited to fiber; PoE works over copper cabling and uses DC power supplied in a safe, low-voltage range defined by the standards.