StarTech.com Cisco GLC-LX-SM-RGD Compatible SFP Transceiver Module - 1000BASE-LX~Cisco GLC-LX-SM-RGD Compatible SFP Module - 1000BASE-LX - 1GbE Single Mode Fiber SMF Optic Transceiver - 1GE Gigabit Ethernet SFP - LC 10km - 1310nm - DDM Cisco Firepower, ASR920, IE2000

Product Overview

AI-generated summary

At £24.01 ex‑VAT, this is the kind of SFP you buy when you just need the link to come up and you don’t want to pay “Cisco tax”. For a UK reseller buyer, that usually means patching spare ports, fixing an aging access switch, or stocking spares for day‑to‑day uptime. It’s a sensible option if you’re using single‑mode fibre at the short-ish range this is designed for and you’re comfortable that “compatible” optics will behave like the real thing in your specific network. In practice, most environments care less about the brand and more about link stability and optics diagnostics—and this type of module is typically fine there, especially if your switch supports the common digital monitoring features.

I’d be a bit cautious if you’re in a locked-down, picky optics environment (some higher-end gear can be more strict about what it will accept) or if you’re relying on long-term, mission-critical optics where you want guaranteed vendor support. Also, don’t buy it if your fibre run or patching conditions are at the edge—you can end up chasing ghosts with attenuation/connector quality rather than a “bad module”. Net: this is good value for most standard 1GbE single-mode fibre use cases where you want predictable performance for the money; I’d only steer away if you’re dealing with very stringent compatibility requirements or you can’t validate optics/compatibility in your exact switch.