StarTech.com Cisco QSFP-40G-LR4 Compatible QSFP+ Transceiver Module - 40GBASE-LR4~Cisco QSFP-40G-LR4 Compatible QSFP+ Module - 40GBASE-LR4 - 40GbE Single Mode Fiber SMF Optic Transceiver - 40GE Gigabit Ethernet QSFP+ - LC 10km - 1270nm to 1330nm - DDM Cisco Firepower, ASR1000, ASR9000

Product Overview

AI-generated summary

At £746.76 ex-VAT, this is a “buy it only if you have to” kind of QSFP+ optics. It’s clearly aimed at people who need **LR4 single‑mode 10km** connectivity and want something that will play nicely with **Cisco gear** (e.g., Firepower/ASR platforms). In day-to-day terms, the biggest question isn’t the distance—it’s whether you’re comfortable betting uptime on a compatible module rather than going through Cisco’s own supply chain. If you’ve got a mixed environment, need spares on the shelf, or you’re trying to reduce optics spend without disrupting operations, StarTech-style compatibility can be a practical middle ground.

That said, I’d be cautious if this is for a live production change where optics compatibility/telemetry strictness has caused pain in your environment. Some networks are picky about thresholds/DDM reporting, optics vendor IDs, and firmware expectations—so if you haven’t validated with your exact switch/router model and software version, plan to test first (or keep it as an emergency spare rather than a primary). In short: **good fit for buyers who know their Cisco compatibility story and want value**, less good for teams who can’t afford even a small risk of “it won’t light up” during a critical deployment.