StarTech.com Cisco GLC-SX-MM-RGD Compatible SFP Transceiver Module - 1000BASE-SX~Cisco GLC-SX-MM-RGD Compatible SFP Module - 1000BASE-SX - 1GbE Multimode Fiber MMF Optic Transceiver - 1GE Gigabit Ethernet SFP - LC 550m - 850nm - DDM Cisco ASR920, IE2000, IE4000

Product Overview

AI-generated summary

For £34 ex-VAT, this is the kind of SFP I’d only recommend if you’re trying to keep a mid-price switch build “working and moving traffic” rather than paying for brand-new optics. It’s a 1GbE SX module aimed at multimode fibre, so in the real world it’s great for short runs in data halls, floors, and campus-style cabling—especially where you already know your link budget and your patching practices are decent. The fact it’s described as compatible with Cisco optics is the main practical selling point: most of the time these will drop into the Cisco-facing ecosystem without drama, but compatibility is always the part you can’t 100% guarantee until you test on the exact switch model/firmware you’ve got.

I’d avoid it if you’re deploying something mission-critical, you need consistent link stability across many sites, or you’re dealing with older Cisco platforms/strict optics policies where some third-party modules can be finicky. Also, if you’re expecting it to perform like a higher-grade “Cisco-branded” optic in harsher environments (lots of bends, marginal fibre quality, frequent patching), this is where you might see more support tickets than savings. Bottom line: **buy it if you’re replacing/adding 1GbE SX optics on known-good multimode links and want cost control**. **Don’t buy it** if you can’t afford the hassle of compatibility quirks or fibre that isn’t absolutely reliable. If you tell me your switch model and the fibre type/runs, I can sanity-check whether SX at that distance is the right call.