This review is for the Gigabit SFP to RJ45 Copper SFP Transceiver, 1000Base-T Mini GBIC, 1.25G SFP-T Copper... product from Ipolex. As one other user review noted, these modules have some connector issues where the RJ45 male connectors do not always click into the female receptacle on the module. No audible click either and the cables often do not seat and *will* pull out if you don’t wiggle them into place. I experienced the same thing on 2 other brands in the same price point as well (H!Fiber and 10Gtek) and yes, I tried other Ethernet cables - same result. They do not work on the Mikrotik CRS305 product line. RouterOS reports these modules (and another brand in the same price point) as OEM SFP-GE-T devices. I tried them on RouterOS v7.1rc3(testing) and on v6.48.4 (stable). Same result. The only ones I have had zero issues with are QSFPTEK 10GBASE-T SFP+ modules which is unfortunate because I dont need 10Gb RJ45 for my use case and they are about $44/module at the time of writing this. I am going to cross post this review on the other devices I purchased and tested as well. I am disappointed in Ipolex (and 10Gtek for that matter) because I have used them in the past and they have worked fine.

The device works as expected

I purchased this item to use in my UniFi Dream Machine Pro. I inserted the ipoplex SFP+ into the WAN SFP+ slot in the UniFi Dream Machine Pro. The white link light illuminated and the UDM Pro allowed all my devices to connect to the internet. Everything seemed to work until I performed several speed test using different speed test sites. My Verizon Fios 1Gbps connection performed well when downloading but the upload speeds averaged between 5-10Mbps. I tried to manually set the speed on the SFP+ port to 1Gbps but that didn’t resolve the issue. I shutdown then turned on the UDM pro while the SFP+ was still connected but that didn’t resolve the poor upload speeds. I changed the WAN SFP+ port to autonegotiation then I shutdown the UDM Pro, turned on the UDM Pro, conducted speed test and the upload speeds were still averaging 5-12Mbps. I switched back to the 1Gbps WAN port, conducted speed test and my upload speeds were excellent (900Mbps - 922Mbps). I decided to purchase a SFP+ from Ubiquiti to see if the upload speeds on SFP+ WAN port on the UDM Pro will perform as expected. I initiated the return process for the Ipoplex but for now I’ll hold onto the Ipoplex in case the actual issue is the SFP+ WAN port on the UDM Pro. I’ll try the Ubiquiti SFP+ when it arrives. If the upload speed doesn’t improve I’ll know something is wrong with the SFP+ WAN port and not the Ipoplex or Ubiquiti SFP+ transceivers. Until then I have to give this product 1 star but I may have to upgrade it if the SFP+ WAN port is the culprit. The Ubiquiti SFP+ arrived and its working well. My FiOS 1Gb ISP connection download and upload speeds are as expected. Average download speed is 850Mbps and average upload speed is 900Mbps. The Ipoplex SFP+ have been returned. I will only use Ubiquiti SFP+ in my UDM Pro and US-16-XG.

For those of you who have Intel x550 adapters such as the Sonnet Twin 10G (Thunderbolt 2) you may have experienced pain with consistent throughput with Marvel Based 10Gb switches like DLINK. It seems you could always sustain 7-8Gbps down, and roughly 2.5-2.8 Gbps out. I decided before I start changing network adapters or switches I would give this a try now that 10Gbase-T SFP adapters are reasonable. Well it worked, I can now sustain between 10.5 and 11.1Gb/s both directions. This matches what I get when directly connecting an Intel x550 and x540 on 10GBase-T directly attache with a 25 CAT7 cable. This is so much easier than ripping out infrastructure!!!! I have used the poleax 10gb SFP 10gb SR transceivers extensively and they have been rock solid. Sure is nice when you just plug and forget and the data keeps crunching!

Purchased to connect my Google Fiber to my Ubiquiti UDM Pro to achieve 2Gbps down / 1Gbps up. I was able to get 2 down but up was limited to 380 Mbps. I replaced it with an SFP+ to Rj45 module from Ubiquiti and reached the full 1Gbps up. Obviously, this product is not truly compatible with Ubiquiti as advertised.

Great price for a 10G SFP+ RJ45. Works just fine in a Zyxel XGS1250-12 switch. I have my Mac Studio plugged into it and Im getting a rock steady10 Gbps link.

Despite the description saying these are compatible with Ubiquiti UniFi, they are not. Link negotiates to 10gb but does not pass traffic. Swapped this out for a Unifi branded 10gig copper SFP, and it worked immediately.

Cables worked as advertised.

This transceiver functions well and negotiates to 10Gb/s on a MikroTik CRS309, but within SwitchOS the transceiver does not report temperature like the manufacturer MikroTik S+RJ10 transceivers do.

Works great in a Zyxel XGS1210-12 switch. Negotiates at both 10gbps and 2.5gbps clients. Gets fairly hot, but I keep temps down with an external fan. 10G works fine for me to connect two switches at 10gbps with about 80-90ft of Cat 6.