Omada 1000Base-LX SMF Mini GBIC Module SM311LS (TL-SM311LS) Up to 20 km transmission distance in 9/125 μm SMF (Single-Mode Fiber) Supports Digital Diagnostic Monitoring (DDM) Compatible with Small Form Pluggable Multi-Source Agreement (SFP-MSA) Hot-Pluggable with maximum flexibility Commercial Product Operating Temperature Range: 0-70°C What This Product Does The SM311LS (TL-SM311LS) Fiber Module Cards are introduced to extend transferring distance. Installed in our managed/smart switches, they can extend the distance to even tens of kilometers, which basically satisfy the distance requirement of LAN. Users can choose the fiber modules according to specific demands.