Macroreer GLC-EX-SMD - 1000Base EX LC, 40 Km, 1310 nm SFP transceiver 100% Compatible with Cisco. Form Factor: SFP Port Interface: 1 x 1.25GBase LC Interface Details: 1000Base LX Data Rate: 1.25 Gbps Wavelength: 1310 nm Distance: 40 Km (24.9 miles) Temperature Range: Extended -10°C to 85°C Digital Diagnostics (DDM) : Yes Connection: Single-mode Fiber (SMF) Hot Swappable: Yes Warraty: 3-year Application: Catalyst Express 500 Metro Ethernet Catalyst 35XX Switches Catalyst 36XX Switches Catalyst 37XX Switches Catalyst 38XX Switches Industrial Ethernet and Smart Grid Catalyst 4500/4500X/4900 Switches Catalyst 6500/6800 Series Switches Data Center and Blade Switching Router Appliance Wireless LAN Controller Quality Guarantee The Macroreer Cisco Compatible Transceiver line is guaranteed 100% Compatible and Functional in its intended router or switch and is 100% MSA compliant. The 1000BASE-EX SFP transceiver comes with an 3-year Warranty. Every item is environmentally tested in its specific port/platform, which includes compliance verification for distance, wavelength, traffic density and light. Reminder Inspection and Cleaning are Critical. Any contamination in the fiber connection can cause failure of the component or failure of the whole system. Even microscopic dust particles can cause a variety of problems for optical connections.