All Cisco compatible DWDM XENPAK 80km transceiver modules are certified for functionality, reliability and performance under rigorous testing parameters. Every DWDM XENPAK 80km is RoHS and MSA compliant and built with Tier 1 grade components and lasers. Each Cisco compatible DWDM XENPAK 80km module is individually tested in it's intended application with identical functionality to the OEM product. All ENET DWDM XENPAK 80km modules are backed by an industry-leading lifetime replacement warranty and technical support.