This Cisco DWDM-XFP-39.77 compatible XFP transceiver provides 10GBase-DWDM throughput up to 40km over single-mode fiber (SMF) at a wavelength of 1539.77nm using a LC connector. It is guaranteed to be 100% compatible with the equivalent Cisco 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. All of our transceivers are Trade Agreements Act (TAA) compliant. We stand behind the quality of our products and proudly offer a limited lifetime warranty.