Cisco QSFP-40G-SR4 Compatible 40GBASE-SR4 QSFP+ 850nm 150M DDM MTP/MPO MMF Optical Transceiver Module

Works perfectly on my Cisco ASR 9000 series switches! Not only does QT have a high quality product, their pricing is very competitive and they are definitely a great partner to work with.

I received the package today, and it arrived in about four days, which was faster than I expected. The module looks good, but there are a few differences between the actual product and what was shown on the website. The account manager explained that the pull ring shape can vary depending on the production batch. The one I received matches the picture they sent me before shipping, so that's fine with me. Overall, the customer service, pricing, and shipping speed have been excellent—now it's time to test the quality.

Bought some 40G SR4 modules for my Cisco Nexus 9000 devices, it works great, plug and play, data transmission is very stable. The account manager's service is also great, helping me check the logistics information in time, and shipping quickly!

These are decent items with nice package and at a good price. The products come on time and work exactly whay they need to. The connection is reliable so far. Will buy again for next project build.

This is my second time to choose QSFPTEK, last year I purchased a switch and it is still running well, which makes me firmly continue to choose QSFPTEK, the 40G optical module has arrived and it can be compatible with my current network equipment very well, I have any questions, my sales reps answer me patiently, it's very good!

We had a positive experience with the 40G SR4 and MTP cable. They performed as expected, and our Cisco 2960S accepted them with no problems. Additionally, the price was reasonable, and the service was exceptional. We will definitely consider using qsfptek as a priority supplier for any future needs.

Initially, I harbored reservations regarding the caliber of the product prior to acquiring it. However, the sales manager's assiduous elucidation of their return policy allayed my fears. Moreover, the fact that they offer a five-year warranty and 24/7 customer service brought about a sense of comfort and led me to endorse procuring from QSFPTEK.

Goes well with my network device and is easy to use, features DDM allowing fast actions if any unusual situation happens, which keeps me free from worry. In addition, it benefits incomparable compatibility applied to all Cisco devices. Overall, l am satisfied with it, thanks.

I have used these 40G modules for nearly a month. I feel so good until now. They run very fast and stably.And the shipping and delivery was fast, I will keep an eye out for this type of product.

I have used a number of different optical transceivers over the years, but this 40G model is by far the best I have ever used. It is extremely reliable and has given me no issues whatsoever.