We no longer carry TP-LINK TL-SM311LS - Gigabit SFP module - 1000Base-LX Single-mode Fiber Min (3182213), but we found this replacement for you.
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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.