StarTech.com Gigabit Fiber 1000Base-SX SFP Transceiver Module - HP 3CSFP91 Compatible - MM LC - 550m~HPE 3CSFP91 Compatible SFP Module - 1000BASE-SX - 1GbE Multi Mode Fiber Optic Transceiver - 1GE Gigabit Ethernet SFP - LC 550m - 850nm - DDM HPE 3812, 3824, 3848

Product Overview

AI-generated summary

For £22.82 ex-VAT, this is a pretty decent “top up the spares” SFP if you’re running multimode fibre and your switch is expecting an SX-style module. The big practical win is that it’s clearly aimed at compatibility with the common HP/HPE SFP footprint (the 3CSFP91 family), so you’re not paying more just for the badge. If your switches are already configured for 1GbE over MMF (LC connectors, typical 850nm range), this is the kind of module that gets you back online quickly without fussing about optics or running new cabling.

That said, I wouldn’t buy it blindly if you’re unsure about your link type. SX multimode modules are very specific: if your plant is actually single-mode, or the far end expects a different optics standard, you’ll waste time and money. Also, while it says DDM/telemetry support, don’t assume every feature shows up identically on every HPE model—always validate in your switch’s transceiver page. Who should buy: IT teams with HPE/HP switches using multimode fibre who want reliable, cost-effective spares for normal 1GbE distances. Who shouldn’t: anyone needing single-mode, 10GbE, or long-reach fibre—spend a bit more (or buy the correct type) rather than chasing compatibility after the fact.