100% Cisco compatible. Guaranteed. The wsp-q40glr4l-st is a Cisco WSP-Q40GLR4L compatible fiber transceiver module that has been designed, programmed and tested to work with Cisco brand compatible switches and routers. It delivers dependable 40 GbE connectivity over fiber cable, for 40GBase-IR4 compliant networks, with a maximum distance of up to 2 km (1.2 mi). technical Specifications: wavelength: 1270nm to 1330nm maximum data transfer rate: 40 Gbps Type: single mode connection Type: LC maximum transfer distance: 2 km (1.2 mi) MTBF: 95, 832, 027 hours power consumption: low power consumption digital Diagnostics Monitoring (DDM): Yes this QSFP+ module is hot-swappable making upgrades and replacements seamless by minimizing network disruptions. Star Tech SFPs all Star Tech SFP & SFP+ transceiver Modules are backed by a star Tech lifetime warranty and free lifetime multilingual technical support. Star Tech offers a wide variety of SFP modules and direct-attach SFP cables, providing the dependability and reliability you need to ensure consistent network performance.