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’s job is to put DC power onto the Ethernet cable so a device like an access point can be powered over the same line used for data. This is typically done without any power negotiation, simply supplying DC through the cable alongside the data signals. That’s why the statement describing it as placing DC voltage onto a CAT-5e cable is the correct description.

The other ideas don’t fit: converting AC to DC on the power supply side describes a basic power adapter, not injecting power into the network cable. Amplifying RF signals on the data line is about boosting radio frequency signals, not powering devices. Acting as a wireless repeater is about extending wireless coverage, not delivering power over the cable.