So, to summarize the PoE situation, this switch can accept PoE INPUT on Port #1 to power the US-8 and can be configured to OUTPUT PoE on port #8. I found this very useful where I had only one ethernet drop to an area for a PoE cam and wanted to add a Smart TV via ethernet without losing the PoE cam.

The UniFi Switch is grounded through the Power Adapter . When powering the switch with PoE, ground the device by connecting the ancillary ground. The UbiquitiUniFi US-8-60Wis an 8 port PoE gigabit switch with four RJ45/802.3af PoE ports and four RJ45 ports. The US-8-60W auto-sensing PoE ports deliver up to 15.4W of power per port all in a compact form factor. Alike the other UniFi Switches, the US-8-60W is fully manageable, delivering robust performance for your network. WARNING: Before enabling PoE passthrough in the UniFi Network Application, ensure that the connected PoE device supports the PoE power (48V).

Standard 16 PoE (Gen1)

The Ubiquiti UniFi US-8is a non-PoE 8 port gigabit switch, which supports PoE passthrough. It is perfect for cleanly adding Ethernet ports where needed, all in a compact form factor.Alike the other UniFi Switches, the US-8is fully manageable, delivering robust performance for your network. The US-8 is a PoE Powered 8-port gigabit switch with PoE Passthrough. Perfect for cleanly adding Ethernet ports where needed, with passthrough to keep your PoE device powered. The US-8-60W is an 8-port gigabit switch with four 802.3af PoE ports. Its auto-sensing PoE ports deliver up to 15.4W of power per port. PoE Availability is a switch's total power, in Watts, that it can distribute among all connected clients. Your PoE Availability must be greater than the sum of all device power requirements to prevent instability or failure. This US-8 also has a pass-thru PoE (output) port on #8. Port 8 has PoE output turned OFF by default.

pair) PoE output is Off by default. Enabling PoE output (via the UniFi Network Application) requires 24W input power via PoE In or DC input. WARNING: When both PoE In and DC Input are connected, the highest voltage power of the two will immediately pass through to PoE Out (if enabled).Since this is a PoE-powered switch -- if you have a "core" switch that provides PoE, you can power this little US-8 via PoE via the core and without a wall adapter. Why would you want this feature? I have my core switch on a large UPS that can power it for hours. By using PoE-powered edge switches, those edge switches stay powered in a power failure without having to put a UPS at each one. Also, I have some places where I don't have wall power handy. That said, the US-8 comes with a regular wall transformer that can power the switch instead of input PoE. I did some testing and the US-8 unfortunately will NOT hot-swap between PoE power and wall power. So if your US-8 first powered up with the wall adapter but also has PoE input power, and you unplug the wall adapter, the switch has to reset itself (and drop connectivity) to transition to using the PoE input power. I bought this primarily to allow me to setup UniFi WiFi WAP at a small office location. It works great to unify multiple wired networks via VLAN into a trunk that their wireless access points (WAP) can use. The only downside is that this thing is fanless, and like many fanless network appliances it feels hot to me. I set up a small fan to blow air onto the wall where I mounted it all, which maybe isn’t necessary but certainly made me feel more comfortable :)