This NetScout® 321-1591 compatible QSFP+ transceiver provides 40GBase-SR4 throughput up to 3m over multi-mode fiber (MMF) using a wavelength of 850nm via a 4xLC connector. It is guaranteed to be 100% compatible with the equivalent NetScout® transceiver. This easy to install, hot swappable transceiver has been programmed, uniquely serialized and data-traffic and application tested to ensure that it will initialize and perform identically. Digital optical monitoring (DOM) support is also present to allow access to real-time operating parameters. This transceiver is Trade Agreements Act (TAA) compliant. We stand behind the quality of our products and proudly offer a limited lifetime warranty.