. The TL-SM311 series Fiber Module Cards are introduced for extending transfer distance attached to the managed/web smart switches. They can extend the distance to several kilometers even tens of kilometers which can basically satisfy the distance requirement of LAN. Users can choose whether & which items to use the fiber modules according to the demand in order to lower cost Key Product Info. Support Full-Duplex Plug-&-Play LED indicators show the operation state of the fiber module Supports Pull-or-Plug with power on switches Internal power from switches