Needed several 400G modules for running an 8km link. When plugged them into my Arista switch, they could be well-matched and were immediately picked up by my switch. No transmission problems and the signal loss was quite low for our link. Worth to buy.

I bought these 400G modules for running a 9km network link. For such a distance, they deal great with it. The speeds are satisfying. Signal loss is quite low. The whole system is pretty stable overall. We haven't found any problems so far.

C'est très efficace d'acheter des produits chez FS, le responsable de compte dédié peut me recommander des produits selon mon besoin, merci !

I had used FS optical modules for several years, with no quality problems. So when our team needed test modules for our first 400G switches, I placed the order without hesitation. The QSFP-DD transceiver arrived quickly with a solid package. Now, the test is going on.