Couldn't find anyone talking about using them with UPS backup power. Most people debating how to connect them have emphasized plugging them straight into the wall, bypassing extension cords or power strips for maximum speed. I've been looking at the technology used in the latest generation of Powerline Ethernet devices and the HomePlug AV2 MIMO standard used in the adapters I've bought (TL-PA9020P) indicates that it does Can transmit data on neutral and ground wires as well as hot wires. It wasn't clear how this would behave when the UPS disconnected power from the wall in standby mode, so I decided to test it myself. Speed is not the main goal in my implementation, I'm just trying to achieve a reliable and trouble-free permanent connection (currently via WLAN). I've connected and paired my two adapters to a pair of UPSs (no problems so far). I ran a quick speed test and saw around 30Mbps. Not super fast but more than enough for what I need. I turned off the circuit breakers on both UPSs and the speed stayed about the same. I then tested the same devices plugged directly into the wall in the same locations and saw around 60Mbps. So 1/2 speed with surge protection and UPS on or off. Now remember this was tested in an apartment with about 45 units sharing a 208 3 phase network with 2 phases per unit. I assume there is quite a bit of noise from other people using similar devices and other equipment causing a variety of radio interference throughout the building. However, I expect they will perform just as well or even better in a commercial environment where I plan to install them later. The two UPSs I tried were the 550VA APC, which only offers backup power and surge protection, and the 1500VA Cyberpower, which has the same features plus an AVR. Both were graded/simulated sine waves. The bottom line is that when I turn off the power and turn on my UPS, the network connection shouldn't drop. Since this network is primarily intended for point-of-sale devices, slower speeds are not an issue. Also saves me the headache of having to cut through the outside walls of a building to run new network cable there. I hope someone finds this useful as I couldn't find this information anywhere on the internet.
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