10G SFP+ SR Networking Transceiver, 10Gbase-SR Optical Module, 10gbs Multimode 850nm 10GE Gigabit Ethernet Mini GBIC for Cisco SFP-10G-SR, Ubiquiti UF-MM-10G, Netgear, Fortinet, Mikrotik, Supermicro

This SFP+ module works great, however, it does run hot. Do not plug these modules in next to each other.

This SFP+ to RJ45 module worked flawlessly with my network setup, providing stable and consistent 10GbE connectivity. The build quality is solid, and installation was plug-and-play with no compatibility issues across my switch. Latency is low, and I haven't noticed any drops in throughput even during heavy file transfers. Like most copper-based SFP+ transceivers, it does run warm, but that’s expected for 10Gb over copper. Adding some airflow in the switch enclosure helps mitigate the heat buildup. If you need a cost-effective way to upgrade to 10Gb networking, this is a solid and reliable option.

Works with my Mikrotik CRS309-1G-8S+in at 10G full duplex auto. So plug and play. Does get hot 63c normal operating. Stats seem accurate inside of SwitchOs and fun to have. For the price, I'm pretty happy.

TL;DR: If your switch port supports egress limits of 2.5Gbps or 5Gbps. You should have good luck with your 2.5/5g ethernet ports. Otherwise, measure with iperf and pay attention to iperf traffic direction before you celebrate. I have a Gigabyte Aorus AM4 ITX board with a RealTek 2.5G port. When connected to my Ubiquiti XG-16 switch however, the ethernet ports negotiate at 1Gbps only. This transceiver popped up in my search as something that will enable the full 2.5Gbe. Plugged it in and everything seemed to work great. Switch sees it as a 10Gbe SFP link while windows sees it as a 2.5Gbe link. Large file transfers looked good too. Between 80-130MB/s. Not great but ok. Running iperf3 however, revealed a big issue with my setup. My NAS (ReadyNas 626X with 10Gbe ethernet) on the same switch ran iperf3 in server mode (iperf3 -s) while the PC ran it in client mode (iperf3 -c): this reported a solid 2.37Gbit/s. Great right! However, large file transfer in use felt worse that with my 1Gbe link. The NAS has a xeon processor and can easily handle the needed 10Gbit speeds for iperf3 (I have a 5950x on the PC which is a beast): tested with a different 10Gbe machine on my network. Investigating further it turns out that I misunderstood. iperf server does not actually serve!! The iperf client pushes data to the server. I need to run the client (PC) with '-R' flag to have the client consume data (switch pushing data into the transeiver). So traffic from PC -> Transciever -> XG16 -> NAS went though at full speed 2.37Gbit/s Traffic from NAS -> XG16 -> Transciever -> PC was a miserable 200-600Mbit/s with tons of retries. If I remove the transceiver and switch to the automatic 1Gbit downgrade (with egress limiting), iperf3 gives me 970MBit/s with 0 retries. Way better than with this transceiver. The general diagnosis at this point seems to be that the switch is pushing packets too fast for the port to handle and dropping a lot of packets slowing everything down. Solution seems to be to turn on egress rate limiting on the port. Basically, tell the switch that even though the SFP+ port negotiates at 10Gbits, limit outgoing traffic to 2.5Gbit/s. However, Ubiquiti in their wisdom do not allow egress rate limiting to more than 1Gbit/s: on a 10Gbit switch! Why!! Gah! So yeah: make sure that your switch can handle egress limits at whatever reduced speed you want to run your 10G connection at. Better still, pick up a Mellanox ConnectX-3 if you have the PCI slot for it.

work as advertised on my UDM Pro

Prompt delivery and product as described

Ingress (Ethernet -> SFP+ device) communication is not stable under load. Egress (SFP+ device -> Ethernet) works well, Ingress (Ethernet -> SFP+ device) works ok, but start crashing under load. Changed the Cable (got a Cat 8): no improvement. Changed the SFP+ slot in the switch: no improvement. Bought a new SFP+ from a other vendor. --> Works. Returned the module. It is sad really, because it took me a while to figure out, and it is a key element to my network (hence 10G), so I the impact was relatively large (for me). I am not looking for cheap, I am looking for value and quality first. Then price Figuring out what is and isn't good is increasingly difficult.

These SFPs are great, i won't use anything else now. I have an original EA UDMP where the two SFP ports are locked at 10gb. By using one of these WAN2 SFP+ i can have my 1gb ONT connection via RJ45 while in the other SFP+ port i use one of these to connect at 10g via RJ45 to a USW+ POE Gen2 switch. Removing the speed lock limitation I also use these to connect the USW to Mikrotik in another part of the house which also has one of these SFP+ adapters - at 10g over cat5e. Basically perfect, they seem to work in anything, work at all speeds - you won't regret it. Other 10g RJ45 SFP+ adapters do NOT do multi-speed.