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For £21.26 ex‑VAT, this is the kind of SFP you buy when you want the link to work and you don’t want to overthink it. It’s a single‑mode 1GbE LX module intended for 10 km class runs, and in day-to-day reseller/customer deployments it typically does exactly what it should: get you stable fibre connectivity over LC single‑mode without drama. If you’ve got Cisco kit on the list and you’ve already standardized on these optics (or you’re refreshing spare stock), it’s a decent value option.
That said, I’d only recommend it to teams who know their platform’s optics compatibility story. Some Cisco switches/routers are picky about third‑party optics (they may “work” but with warnings, reduced diagnostics, or outright refusal depending on firmware). Before you trust it in production, it’s worth testing one module in the exact model/IOS/firmware combination you’re deploying. If you’re running mission‑critical links, you’ll usually get fewer surprises with genuine Cisco optics—so this is best for non-critical redundancy, lab/testing, or sites where you can swap quickly if a platform doesn’t like it.

STARTECH
StarTech.com MSA Uncoded Compatible SFP Module, 1000BASE-SX, 1GbE Multi Mode (MMF) Fiber Optic Transceiver, 1GE Gigabit Ethernet SFP, LC Connector, 550m, 850nm, DDM, 1Gbps Mini GBIC Module - Lifetime Warranty (SFP1000SXST) - SFP (mini-GBIC) transceiver module - 1GbE - 1000Base-SX - LC multi-mode - up to 550 m - 850 nm - for P/N: US1GA30SFP, US1GC30SFP

Lenovo
Lenovo - SFP+ transceiver module - 1GbE - RJ-45 - for Storage S2200 6411, S3200 6411

STARTECH
StarTech.com HPE 455883-B21 Compatible SFP+ Module, 10GBASE-SR, 10GbE Multi Mode (MMF) Fiber Optic Transceiver, LC 300m, 850nm, DDM, HPE 6120XG, 6120G, Flex Fabric, Mini GBIC Transceiver - Lifetime Warranty (455883B21ST) - SFP+ transceiver module (equivalent to: HP 455883-B21) - 10GbE - 10GBase-SR - LC multi-mode - up to 300 m

STARTECH
StarTech.com Cisco Meraki MA-SFP-1GB-LX10 Compatible SFP Module, 1000BASE-LX, 1GbE SMF Optic Transceiver, 1GE Gigabit Ethernet LC Connector, 10km, 1310nm Cisco Meraki MS225, MX400, MS250 - Lifetime Warranty (MASFP1GBLX10) - SFP (mini-GBIC) transceiver module (equivalent to: Juniper SFP-1GE-LX) - 1GbE - 1000Base-LX - LC single-mode - up to 10 km - 1310 nm