StarTech.com Cisco GLC-SX-MM Compatible SFP Transceiver Module - 1000BASE-SX~Cisco GLC-SX-MM Compatible SFP Module - 1000BASE-SX - 1GbE Multimode Fiber MMF Optic Transceiver - 1GE Gigabit Ethernet SFP - LC 550m - 850nm - Cisco IE3400, IE3300, IE3200

Product Overview

AI-generated summary

For £24.24 ex-VAT, this is exactly the kind of “keep the network running” SFP most SMEs should buy—*assuming* you already know you’re on the right fibre type. It’s designed to behave like Cisco’s GLC-SX series over multimode using LC connectors, so it’s a sensible cost-saving swap for people running Cisco IE3200/IE3300/IE3400 where the original transceiver pricing stings. If you’ve got short-ish multimode runs and you want predictable link behaviour without paying Cisco tax, it’s good value.

I’d be cautious only on the usual gotchas: distance/fibre mismatch and module compatibility. SX optics are fine for multimode, but if you’ve got the wrong fibre grade, long runs, or you’re trying to use it on the wrong port type/requirements, you’ll get intermittent links or “works until it doesn’t.” Also, if you need spares for mission-critical links, buy a couple at once and test them on the exact switch/port before relying on them in production.

**Buy this if:** you’re maintaining a Cisco IE stack with multimode LC cabling and want low-cost replacements. **Skip it if:** your plant has uncertain fibre runs, mixed media, or you want guaranteed “drop-in” behaviour without verifying compatibility first.