100% Cisco compatible. Guaranteed. The qsfp-40g-csr4-st is a Cisco QSFP-40G-CSR4 compatible fiber transceiver module that has been designed, programmed and d to work with Cisco brand compatible switches and routers. It delivers dependable 40 GbE connectivity over fiber cable, for 40GBase-SR4 compliant networks, with a maximum distance of up to 400 m (1312 ft.). Technical Specifications: wavelength: 850nm maximum data transfer rate: 40 Gbps Type: Multi mode connection Type: MPO maximum transfer distance: 400 M (1312 ft.) MTBF: 244, 610, 583 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.