This Cisco® DWDM-SFP-3977 compatible SFP transceiver provides 1000Base-DWDM throughput up to 80km over single-mode fiber (SMF) at the wavelength specified between 1530nm and 1560nm 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.