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Tp-Link Gigabit Sfp Module, 1000Base-Sx Multi-Mode Fiber Mini Gbic Module, Plug And Play, Lc/Upc Interface, Up To 550/220M Distance (Tl-Sm311Lm)The TL-SM311 series Fiber Module Cards are introduced for extending transfer distance. Attached to our managed/smart switches, they can extend the distance to several kilometers even tens of kilometers whic..