Cisco Compatible 800GBASE-2FR4 Twin-port QSFP-DD PAM4 1270 to 1330nm 2km DDM Dual Duplex CS/UPC SMF Optical Transceiver Module

The FR4 was chosen not because of its superior performance, but because it perfectly suits our existing limitations. Some of our legacy systems don't allow for major changes to the cabling structure, so compatibility optimizations can only be done at the module level. This model perfectly fits the "can continue running with existing resources" scenario, a very practical engineering choice, not an idealistic solution, but very useful.

Fast shipping and excellent communication throughout the process. Everything showed up exactly when promised.

Deployment went more smoothly than expected. The switch recognized it quickly, and it remained relatively stable under heavy traffic. Compared to the original manufacturer's price, QSFPTEK's solutions are indeed easier to budget. So far, we haven't encountered any abnormal alarms.

I reached out through the chat box asking which products would work for my connection setup, and the sales rep, Talia, recommended this 800G QSFP-DD module. Really appreciate it!

I ordered just one to try out first, and it worked great with my Cisco switch. So I ended up buying 30 more and got a discount. Thanks a lot!

The account manager responds promptly, and the product offers stable transmission and excellent performance.

Bought a pair of these mainly for a lab expansion project. We move hardware around pretty often during testing, and the modules have held up fine through multiple reinsertions. One small thing I liked is the latch feels solid, doesn’t have that loose feeling some cheaper optics do.

Installed these on a long-distance interconnect and they've been working flawlessly. Compatibility was smooth, signal quality has stayed stable, and the CS connectors made cable management much cleaner.

The sales manager responded promptly, providing excellent service! Because I was continuing with this module, the QSFPTEK sales manager helped me ship the module in a timely manner. I will definitely choose them again!

Installed these 800G 2FR4 modules in our AI cluster interconnect last month and they've been running reliably ever since. Link stability and DDM readings have been solid, and compatibility with our switches was seamless. The dual CS design also helped reduce cable congestion in a high-density rack. Good performance for the price.