Which statement describes a passive injector?

Which statement describes a passive injector?

• A. It places direct current (DC) voltage onto a CAT-5e cable.
• B. It converts AC to DC on the power supply side.
• C. It amplifies RF signals on the data line.
• D. It acts as a wireless repeater.

Answer: (A)

A passive injector works by delivering DC power onto an Ethernet cable, allowing a powered device to receive power through the same copper wires used for data. It doesn’t perform any power negotiation or signal processing; it simply injects a DC voltage onto the CAT-5e cable so the connected device can draw power directly. That’s why this statement is the best description: the injector’s role is to place DC on the cable. The external power supply may handle converting AC to DC, but the injector itself isn’t a converter or a negotiation device. It also isn’t used to boost RF signals or extend wireless coverage, which are outside its function.