TP-Link TL-POE4818G Gigabit PoE Injector 48V 18W Adapter

The TP-Link TL-POE4818G is a passive Power-over-Ethernet injector that adds PoE capability to a single network run without replacing an existing switch or router. It sits inline between the switch and the powered device, combining data from one Gigabit Ethernet port with 48V/18W of DC power and delivering both over a single Ethernet cable to the output port. This makes it a straightforward solution for deploying an IP camera, wireless access point, or VoIP phone in a location where running a separate power cable would be impractical — up to 100 meters (328 feet) away.

Setup is entirely plug-and-play: connect the data-in cable from the switch, the data-and-power-out cable to the device, and plug in the included power adapter. No drivers, software, or configuration are involved. Because this is a passive injector, power is always on at 48V — there is no handshake or negotiation as with IEEE 802.3af/at active PoE. This means it works well with devices explicitly designed for passive 48V PoE, but it should not be used with devices that lack passive PoE support, as the constant voltage could cause damage. Both ports operate at Gigabit speed, ensuring the injector does not create a bottleneck on the network.