StarTech.com MSA Compliant QSFP+ Transceiver Module - 40GBASE-SR4~MSA Uncoded QSFP+ Module - 40GBASE-SR4 - 40GbE Multi Mode Fiber (MMF) Optic Transceiver - 40GE Gigabit Ethernet QSFP+ - MPO 100m - 850nm - DDM

Product Overview

AI-generated summary

At £31.64 ex-VAT, this StarTech 40GBASE-SR4 QSFP+ (MSA uncoded, with DDM) is the kind of no-drama transceiver you buy when you’ve got a known-good 40G QSFP+ switch and you just need spares or extra ports for short-reach multimode. The MPO/OM4-style 850nm use case is pretty common in UK data halls, and if your cabling is up to spec, SR4 over MMF for ~100m is where these things make sense. If you’re a reseller supporting SMEs or mid-market sites, this is the sort of “replace fast, get link, move on” optic that keeps downtime down.

That said, I wouldn’t treat it as a universal fix for anything “40G” — the MSA compliance helps, but compatibility still depends on the host switch’s optics support and how strict it is about vendor/DOM handling. Because it’s specifically uncoded, if you’ve got a picky environment (or you’re mixing brands across the same switch model), you can run into monitoring quirks or “it works but doesn’t behave nicely” situations. If you’re expanding a clean, like-for-like set, it’s good value; if you’re troubleshooting or building a mixed-fleet optics strategy, I’d rather spend a bit more on something you can validate with your exact switch model and existing optics inventory.