Our side A was a 100G device, and side B was 25G switch. We wanted to connect the two sides via direct link, not using 100G to 4x 25G DAC breakout cables. We were not sure the link of 100G port - QSFP28 to SFP28 converter module - fiber cable - 25G module - 25G port was right. Then we asked help from FS team. He said there was no mistake, but we must ensure our 100G port support 100G to 4x 25G transmission. He then helped us checked the specification of our device, and it supported 4x 25G. Finally, we got 25G module #67991 and the converter module #73840. They helped us to achieve a direct link between 100G port and 25G port.

Bought the 25G optical module for Cisco N9K-C93180YC switch. I made the order after FS AM ensured the compatibility. My network switch could read the module's TX and RX power when I plugged the module into its port.

We’ve got a couple of these for testing, and we see no difference between these and Cisco’s own transceivers. That being said, you can get the same functionality at a much lower price point by using these. Hotplugged these into my cisco switches, the switches were linked and sending data over the MMF within just a few seconds. I'll be buying more of these the next time I need transceivers.

We have a bunch of Arista stuff here in our DC, and are always hesitate about using off brand networking modules. But I have to say, I'm pleasantly surprised with these: the connection is stable with no issues for over three months. Would recommend to anyone needing solid 25G links.

I got several 25G SFP28 modules from FS, and I didn’t see any difference between them and Cisco’s own transceiver modules except that the thrid-party transceivers are more reasonably priced. Delivery is fast. They are extremely usable right out of the box and work great on Cisco C9500-24Y4C switches. Will buy again if I have other needs.

After we received these modules, we did full tests on them to make sure there were no performance issues and they passed all the tests. They have full compatibility with Arista 7160. I’m running these SFP28 modules on Arista 25G SFP ports without any issues as expected. Pleased with the FS account manager. I have repeatedly checked the information with my AM and got quick and helpful responses.

We were building up a 25G/100G network with some transceiver modules and 100G to 4x25G break-out DACs so as to bridge Cisco N9K-C93180YC-EX to Mellanox 4421/4121A-ACAT card.
At the very first beginning, I was a little skeptical about their performance. I doubted whether the third-party vendor can be compatible with our switches, so I checked the transceiver module with customer service and asked for the tests report and eye diagram of this module to confirm its functionality. Everything I got showed the products were exactly what I need. So I placed the order. Secure packaging arrived four days after I placed the order. No technical issues with the product. Everything communicated flawlessly at the speed it was expected to be. And FS customer service is good. I received e-mails from my AM after I got the package. That’s really caring and considerate. Everything goes well now, no complaints. I love these awesome transceiver modules.

Material já foi entregue e ainda recebo e-mails cobrando e também o imposto cobrado para entrega é altíssimo

We used to buy 1G/10G modules from FS, and this year we upgrade to 25G 100G project. They give me perfect solution and products, and confirmed every details, very nice! Good products! Good team! Will back again for my future project.

Once I received the 25G modules, I tested them, and all of them worked great, without any issues.