- Network Admin
How to Segment Your Network for Better Security
24 Nov, 2025







£101.44 inc. VAT
AI-generated summary
For £84.67 ex-VAT, this StarTech 25G SFP28 SR optical is a pretty sensible buy **if** you’re dropping 25Gbps over short-ish multimode runs and you want to keep the spend under control. The headline for day-to-day use is reliability: SR with DOM/DDM is exactly what most switch folks look for when they want basic optical health monitoring without adding extra tooling. The 100m class is also the sweet spot for typical rack-to-nearby MDF/IDF cabling in offices and data rooms, where multimode usually makes financial sense versus swapping to long-reach single-mode optics.
Who should buy: **IT teams standardising 25G optics across a mix of switches**, especially where you have multimode fibre already in place, and you care about visibility (DOM/DDM) for troubleshooting and uptime. Who should *not* buy: anyone assuming “mmf = always fine”—if you’re pushing further than your plant supports, or you’re on single-mode fibre, this will be the wrong optic and you’ll waste time/returns. Also, sanity-check that your exact switch model is happy with third-party SFP28 optics (most are, but it’s not universal). If compatibility lines up, it’s solid value; if not, you’ll be paying £84.67 to discover a firmware/compatibility mismatch.

STARTECH
StarTech.com Cisco GLC-LH-SM Compatible SFP Module, 1000BASE-LX/LH, 1GE Gigabit Ethernet SFP, LC Connector, 10km, 1310nm, Cisco IE3400, IE3300, IE3200, Mini GBIC Transceiver SFP Module - Lifetime Warranty (SFPGLCLHSMST) - SFP (mini-GBIC) transceiver module - 1GbE - 1000Base-LH - LC single-mode - up to 10 km - 1310 nm - for P/N: ET91000SFP2, ET91000SFP2C, IES101002SFP, MCM1110SFP, PEX1000SFP2

STARTECH
StarTech.com 12-24 Server Rack Screws - 50 pack - Nickel-plated - Rack screws - silver - US government - TAA Compliant (pack of 50 pieces) - for P/N: RK630WALVS, RK830WALVS

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

STARTECH
StarTech.com HPE JD119B Compatible SFP Module, 1000BASE-LX, 1GbE Single Mode (SMF) Fiber Optic Transceiver, 1GE Gigabit Ethernet SFP, LC Connector, 10km, 1310nm, DDM, HPE 5900, 12500, 5500 - Lifetime Warranty (JD119BST) - SFP (mini-GBIC) transceiver module (equivalent to: HP JD119B) - 1GbE - 1000Base-LX - LC single-mode - up to 10 km - 1310 nm