CLASSYTEK Passive PoE Injector and PoE Splitter Kit with 5.5x2.1 mm DC Connector Power Over Ethernet Adapter - Pack of 10 Set (White or Black)

Worked fine to bypass POE power around a non POE switch.

These work great, just what I needed. Its much easier working with these than trying to figure out which PoE standard my cheap Chinese IP "PoE" cameras use... I wish the RJ45 end was a tad bit smaller so I didnt have to terminate and connect the camera in the attic but thats not any kind of defect on the company's side. These are cheap (cost) and so far work fantastic. I understand all of the math and logic behind attenuation with these, but same goes for the 802. PoE standard.. this is just a lot smaller and easier to tuck away in my server rack than having a PoE brick and power supply. Also the build quality on these are very nice and solid. I see them lasting forever.

Had to use in two instances. PoE switch connecting to a camera that had both network and power cable and to a camera that needed extra power on a non PoE switch. both worked well. Thought cables were a bit short.

Tested OK with multimeter when connected to a PoE switch (was only using 1 side). I have not used in production yet but for a passive device/connector I expect it to work well for indoor use.

These are fine as quality and function are concerned but something to consider can be problematic, that is using these to send low voltage power over longer cable runs, over fifty feet or so, might not work due to the voltage drop in the very small gauge wires used in many ethernet cables. I tried to power up a 5 port switch at the end of a 100 ft cable and the voltage at the business end had been dropped from 5 to about 2.9, needless to say, not sufficient to operate the device. I think about 20 feet with a good quality CAT5+ cable is about as much as you can expect to bedependably functional. If I have some time I will do some decent measurements and post the results.