A ceiling access point needs power over its Ethernet cable. The closet switch does not supply that power, and an outlet is available in the ceiling. Which device should feed the access point?
Select an answer to reveal the explanation.
Short Explanation
The switch is a dry faucet, and the access point needs water in the same hose. You splice a PoE injector into that hose and plug the injector into the ceiling outlet. A cable modem, a fiber handoff, and a punchdown block do not pour power onto the pair.
Full Explanation
A PoE injector takes a data cable from a switch that has no PoE and adds power from its own supply, then sends data and power on toward the access point. The closet switch does not supply PoE and a ceiling outlet is available, so an injector at that outlet is the device that fits. A cable modem terminates a coax internet service. It does not add PoE to an existing switch run. An optical network terminal terminates a fiber service. It does not inject power onto this copper access-point cable. A punchdown block terminates pairs. It is not a power source. Exam caveat: the injector's power class has to meet the access point. An injector that is too small will not bring the radio up. Operational check: connect switch to injector data-in, injector data-out to the access point, plug in the injector, and confirm the access point boots. Use the injector's data-in jack toward the switch and the powered jack toward the access point, then confirm the radio's light comes on. Label the injector data-in and data-out so a later tech does not swap the two jacks.