Review on UCTRONICS 802 3Af Splitter Ethernet Raspberry by Amy Fenner

WARNING: WILL NOT WORK "OUT OF THE BOX" WITH RASPBERRY PI 3B+. Read Details I've used about 12 of these otherwise great devices to power Raspberry Pi 2 and 3. POE powered RPis save lives when you need to remotely reboot or install in places without power. I highly recommend this splitter for RPi 2/3B but NOT for RPi3B+. With the RPi 3B+ (the first to have a pseudo gigabit ethernet port), this splitter will NOT auto-negotiate the network connection (on a fresh new Raspbian image with all updates). It powers the RPi with no issues, but the network connection is down/failed. After a bit of trial and error troubleshooting, I found out that the connection isn't auto-negotiated, but when set manually it works, but ONLY at 100Mbps with half duplex (which is as fast as a POE anyway -splitter) . because it isn't). gigabit splitter). (Performance in full duplex was about 10% of half duplex.) (The RPi worked very well on a direct gigabit connection, so the splitter definitely plays a role in the problem.) To get it working on Rpi3B+, run the following from a ssh shell (you should temporarily use other network/power connections to make it work): sudo apt-get install ethtoolsudo ethtool -s eth0 speed 100 duplex half autoneg off I also had to manually set the switch port to 100Mbps Set half duplex because my switch (Unifi US-8-60W) is not automatically adjusted. I would recommend this for older Raspberry Pis but NOT for RPi 3B+ as it requires extra steps and doesn't support gigabit speeds even if it works as intended (it's only a 100 megabit device).