StarTech.com Cisco WSP-Q40GLR4L Compatible QSFP+ Module - 40GBASE-LR4 - 40GbE Single Mode Fiber SMF Optic Transceiver - 40GE Gigabit Ethernet QSFP+ - LC 2km - 1270nm to 1330nm - DDM Cisco Firepower, C9300, C3850

Product Overview

AI-generated summary

At ~£504 ex-VAT, this is one of those “looks like a safe compatible” optics that can be either brilliant value or a total headache depending on what you’re plugging it into. In real deployments, the fact it’s aimed at Cisco gear (C9300/C3850 and related Firepower use-cases) plus having DDM support is the right baseline for avoiding that annoying “module not supported / power levels out of range” nonsense. If you’ve got a lab-to-production pipeline where you need to replace/standardise 40G LR4 optics and you want something that behaves like a proper optics module (not a flaky generic), this is a sensible category to consider—especially if you’re trying to keep spend under control.

Who should buy it: teams replacing failed 40G LR4 optics in supported Cisco environments where optics compatibility is proven/expected, and where you care about visibility (DDM) for monitoring. Who should not: if you’re in a mixed-vendor environment, can’t verify compatibility with your exact switch/IOS/Firmware and optics policy, or you’re buying this “blind” because of price—optics returns are rarely fun. If you can confirm it’s on your platform’s compatibility expectations (and your partner/reseller can back it up), it’s a fair buy. If not, I’d rather pay a bit more for a route where you’re less likely to waste time troubleshooting.