Build stable Gigabit links across single-mode fiber without adding unnecessary complexity. The D-Link DIS-S310LX is a 1000BASE-LX SFP optical transceiver intended for longer-reach network segments where single-mode fiber is the right medium for clean transport and controlled signal loss. With LC connectivity, 1310 nm optics, and support for distances up to 10 km, this module fits backbone extensions, building-to-building runs, and aggregation paths that need more reach than multimode SX optics can provide. It is a practical choice for teams standardizing on compact, serviceable optics that match enterprise fiber plant design. For procurement and operations teams, the value is straightforward: a focused transceiver that supports reliable single-mode connectivity in a small footprint. When the network design calls for disciplined reach, predictable optical behavior, and a module that slots cleanly into existing SFP infrastructure, this D-Link option belongs on the shortlist.