In a PoE system, power and data are delivered over what?

In a PoE system, power and data are delivered over what?

• A. A single Ethernet cable carrying both power and data
• B. Two separate cables for power and data
• C. A wireless link carrying both power and data
• D. Coaxial cable carrying power and data

Answer: (A)

Power over Ethernet lets power and data ride on the same cable. It uses a standard Ethernet cable to carry data signals while also delivering DC power from the switch or injector to the powered device, so devices like IP cameras or VoIP phones can operate without a separate power run. The power is delivered in a way that doesn’t disrupt data transmission, and devices negotiate the power level to ensure safe operation. Two separate cables would mean a separate power line, which is not PoE. A wireless link isn’t how PoE delivers power, and coaxial cable isn’t used for PoE alongside data.

Power over Ethernet lets power and data ride on the same cable. It uses a standard Ethernet cable to carry data signals while also delivering DC power from the switch or injector to the powered device, so devices like IP cameras or VoIP phones can operate without a separate power run. The power is delivered in a way that doesn’t disrupt data transmission, and devices negotiate the power level to ensure safe operation.

Two separate cables would mean a separate power line, which is not PoE. A wireless link isn’t how PoE delivers power, and coaxial cable isn’t used for PoE alongside data.