StarTech.com Cisco GLC-LH-SMD Compatible SFP Transceiver Module - 1000BASE-LH~Cisco GLC-LH-SMD Compatible SFP Module - 1000BASE-LH - 1GbE Single Mode Fiber SMF Optic Transceiver - 1GE Gigabit Ethernet SFP - LC 20km - 1310nm - DDM Cisco Firepower, IE2000, IE4000

Product Overview

AI-generated summary

This StarTech 1GbE SFP (single-mode, long-haul LC, ~20km class, with DDM) is the sort of “gets the job done” optic you buy when you want working fibre uplinks without paying the Cisco-brand tax. At **£40.68 ex-VAT** it’s priced like a sensible B2B consumable—especially if you already know the link budget is fine and you’re just trying to keep downtime low. DDM is a nice practical inclusion: it helps you spot a failing module or marginal fibre before the link starts flapping.

That said, I wouldn’t call it a universal recommendation. These Cisco-compatibility labelled optics usually work best with the exact platforms they’re intended for (you’ve mentioned Firepower/IE series), and compatibility can be picky depending on firmware/hardware generation. Also, because it’s a **1GbE** module, don’t buy it if you’re really trying to modernise bandwidth—you’ll just be paying the optics cost while capping yourself at gigabit. If you’re matching it to a supported Cisco environment and you need single-mode for longer distances, it’s good value; if you need broad “plug-and-play across anything” flexibility, or you’re unsure about platform support, spend the extra time validating first.