This product is Guaranteed 100% Compatible with the Manufacturer Original. The Compatible Cisco 1000BASE-EX SFP operates on standard single-mode fiber-optic link spans of up to 40 km in length. A 5-dB inline optical attenuator should be inserted between the fiber-optic cable and the receiving port on the SFP at each end of the link for back-to-back connectivity. SFP (mini-GBIC) offers enhanced dependability with maximum productivity With 1000Base-EX technology, enjoy up to 1000Mbps data transfer rate over optical fiber cable Up to 10x faster than standard Ethernet connection and provides high-performance Optical fiber cable compatible - Spans afar and provides speedy data transmission rates between servers and network components Single-mode fiber mode support for reliable, fast transfer, sharing, and access to the data and information Hot-swappable form factor for your convenience and simplicity of usage SFP (mini-GBIC) with data networking application/usage for maximum dependability and convenience