Restricted by our tight budget, the account manager advised this 100G 4WDM QSFP28 transceiver for me and explained the differences between it and the LR4 module. We also bought some LC cables and patch panels to realize the connection with the help of the tech guys. We are thrilled by the professionalism and the thoughtfulness of the FS staff. Thanks again for your helpful advice and guidance!

Die Lieferzeit dauert nur 2 Tage. Wunderbar! FS bietet eine ganz schnelle Lieferung.

A little bit worried about third-party vendors previously: products' quality & compatibility, shipping & delivery, after-sales services, etc. Things seemed to be different for FS. We purchased some 100G modules for trial. All of them passed our tests with great performances, and fully compatible with our switches. The parcels were intact and arrived on time, by the way. Totally beyond my imaginations. We would continue to place orders here.

Requiring for some 100G optical modules but with relatively tight-budget. Have bought modules from FS before, which left a really good impression on me. So I chose FS again, which turned out to be a wise choice without regrets. These QSFP-100G-4WDM modules operated well with the devices in our data center. Good-quality products at reasonable prices. Fabulous!

I wanna use this 100G transceiver to connect Cisco Catalyst C9500-32C and Catalyst C9500-24Y4C switches. Then we’ve realized a single 100G point to point link. Now it works as expected and no warnings occur. Before we chose it, the tech staff gave us very nice support for our solution.

In my position I'm constantly looking for responsible ways to save my company money. But we also have high quality requirements. They said these transceivers had been tested strictly on Cisco switches. Now its performance proves it. It works flawlessly on my Cisco devices. Satisfied to receive expected high compatibility transceivers.

This was our first time to visit FS online shop, and found it almost covered a full line of networking equipment and assemblies. We just ordered two 100G modules. The sales confirmed our using condition and then shipped them quickly for us. They operated fine with our devices. May consider buying patch panels to manage our cables later.

We confirmed the TX power of this product with the sales before ordering. It was -6.5-2.5dBm and met our expectation. We used it on our Cisco switch, data went well.

Thanks for the recommendation on the choice of QSFP28. The QSFP-100G-eCWDM4-S transceiver modules play an important part in a single 100Gbps point to point link between two Catalyst 9500 series switches. Trust depends on specialty.

Got two together with the S5850-48S2Q4C switch, one for the up-link, one as the spare set. Work well and haven’t noticed/experienced any issues so far! Great stuff!!