The ET91000SM402 1000 Mbps Gigabit Single Mode Fiber Media Converter SC (40 km) lets you extend a Gigabit Ethernet network over single mode fiber by up to 40km (25 miles). A cost-effective solution for connecting a Gigabit Ethernet (1000 Base-T) network to remote network segments over a (1000 Base-LX/SX) fiber backbone, the Gb E to SM fiber converter supports full Gigabit speeds for ideal network performance & scalability. Designed to offer a durable & convenient Ethernet to fiber solution, the Ethernet to SC Fiber converter features an all-steel chassis, & a simple plug-&-play installation with minimal configuration required. For added versatility, this fiber media converter supports standalone operation, or installation into the 20 Slot, 2U Rackmount Chassis (ETCHS2U). Backed by a Star Tech.com 2-year warranty & free lifetime technical support. The Star Tech.com Advantage Link loss forwarding, remote status monitoring help ensure maximum up-time Provides Ethernet to Fiber conversion as a standalone device, or can be installed into the ETCHS2U 20 slot chassis for added versatility Rugged steel casing for added durability in harsh environments