Add dependable Gigabit fiber connectivity to Cisco switch and router environments with this StarTech SFP transceiver. Designed, programmed, and tested for compatibility with Cisco GLC-LH-SMD deployments, it supports 1000BASE-LX/LH networking over single-mode or multimode fiber through an LC duplex interface. This module is a strong fit when you need a replacement optic that behaves predictably in production. It supports up to 10 km on single-mode fiber and up to 550 m on multimode fiber, giving infrastructure teams flexibility across campus, branch, and data closet links. The hot-pluggable SFP design keeps maintenance simple, while the lifetime warranty adds confidence for long-term standardization. For teams managing mixed Cisco environments, this transceiver helps reduce compatibility risk without forcing a redesign of the fiber plant. It is a straightforward way to restore, expand, or standardize 1 GbE optical links with a compact module that fits enterprise operations.