100% Cisco compatible. The qsfp-40g-csr4-st is a Cisco QSFP-40G-CSR4 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-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 offers a wide variety of SFP modules and direct-attach SFP cables, providing the dependability and reliability you need to ensure consistent network performance.