Which of the following is used for powering small, Ethernet devices over standard Category cabling?

Power over Ethernet (PoE) is utilized for powering small Ethernet devices, such as IP cameras, VoIP phones, and wireless access points, over standard Category cabling. This technology allows both data and electrical power to be transmitted simultaneously over a single Ethernet cable. This is particularly advantageous in situations where it may be impractical to have separate power sources for these devices—such as in locations that are difficult to access or where power outlets are limited.

By using PoE, the devices receive their power directly from the network infrastructure, which simplifies installation and reduces the amount of wiring necessary. This approach not only streamlines the setup process but also makes it easier to manage and relocate devices as needed.

Other options, such as AC Power, USB Power, and Solar Power, do not specifically utilize Ethernet cabling to provide both power and data transmission concurrently. AC power typically requires additional cabling and outlets, USB power is generally limited to proximity to a computer or charging hub, and solar power would need a dedicated setup that doesn’t integrate with traditional Ethernet networking. Therefore, PoE stands out as a unique solution for this specific application.