Review on 💨 High-Performance QSFPTEK Gigabit SFP Module: 1000BASE-LX/LH 1310nm 10km DDM Single-Mode LC Mini-GBIC Transceiver for Cisco, Ubiquiti, Netgear, Mikrotik, and Open Switches by Donny Collins

I bought this device for use with Ubiquiti UniFi Switch 8-150W with the original goal of just connecting to a 10/100 device that doesn't have a POE required leaving all 8 POE open ports for my POE gear. Unfortunately, we were unable to connect at 10/100 speed with this device on this SFP port. It will cycle through the LEDs endlessly, indicating that it tried to set itself up, failed, and then tried again. However, when I switched to using this device for a 1G uplink to my upstream switch, it worked great and had no issues. In general, the device works fine as long as you use 1G (and the problem may be with the switch, not the SFP transceiver). It does get a little warm, but that's okay and generally works as expected.