StarTech.com Cisco SFP-10G-LR-S Compatible SFP+ Module - 10GBASE-LR - 10GbE Single Mode Fiber SMF Optic Transceiver - 10GE Gigabit Ethernet SFP+ - LC 10km - 1310nm - DDM Cisco Firepower, ASR9000, C9300

Product Overview

AI-generated summary

At £78.40 ex‑VAT, this is priced like a sensible “get the link working” SFP+ for single‑mode 10GbE at up to 10km. If you’ve got Cisco gear that’s picky about optics, the fact it’s sold as compatible and targeted at platforms like Firepower/ASR/C9300 is the right direction—this is the sort of module that’s typically fine for routine production links where you just need it to negotiate cleanly and stay stable. For most UK SME/Mid-market networks, it’s a good value point versus OEM optics, especially when you don’t want to tie up budget.

Why you might *not* buy it: optical compatibility can be the silent killer—some switches (and specific IOS/XE releases) will refuse or show warnings with certain third‑party optics. Before buying, check your exact switch model/firmware and ideally confirm it’s been used successfully on that line card/port type. Also, “10km” assumes proper fiber plant and end-to-end budget; if your fibre has higher loss (older runs, patch leads, dirty optics), you’ll get intermittent link or no link, and you’ll wish you’d spent a bit more on known-good matched optics or validated loss testing. Overall: buy it if you need a cost-effective, proven-in-practice transceiver for straightforward SMF 10GbE links and you can validate compatibility on your specific Cisco platform.