StarTech.com Cisco SFP-10G-BX-D-40 Compatible SFP+ Module - 10GBASE-BX - 10 GbE Gigabit Ethernet BiDi Fiber (SMF)

Product Overview

AI-generated summary

At £27.10 ex-VAT, this is the kind of SFP+ optic you buy when you need a cheap, reliable “get the link up” replacement rather than paying Cisco-branded prices. The BiDi (single-fibre send/receive) aspect is the real point here: if your existing fibre run is set up for BiDi and you’re maintaining short/controlled datacentre distances, it can save a surprising amount of time and money versus re-cabling or hunting for a perfect vendor match.

That said, I’d only buy it if you’ve already confirmed your switch’s compatibility and your fibre wiring matches the BiDi expectations (otherwise you’ll waste time on link issues that aren’t the module’s fault). Also, at this price, think of it as a practical maintenance part—not something to standardise across a critical backbone without testing. If you run a small office/SMB network, have spare ports for planned replacements, or you’re keeping a few critical links resilient with budget spares, it’s a solid choice. If you’re deploying at scale or can’t easily validate compatibility, stick to optics your vendor officially supports to avoid intermittent headaches.