- Network Admin
How to Handle Network Outages: A Response Plan
13 Jan, 2026




£43.04 inc. VAT
AI-generated summary
At £35.92 ex-VAT, this kind of “compatible” 1G SFP-to-RJ45 module is usually the right move when you’ve got an older switch (or one that’s picky about optics) and you just need a dependable copper port without paying the vendor tax for branded transceivers. The 100m copper reach is also genuinely useful in real wiring rooms—especially when you’re using Cat5e/Cat6 patching and want something that behaves like a normal RJ45 uplink/edge connection. In day-to-day terms: it’s the sort of part you buy for pragmatic maintenance spares or for filling in access ports where fibre isn’t needed.
That said, I’d only buy this if your switch model is known to accept third-party SFPs cleanly. “Compatible” can range from “works perfectly” to “it flashes, drops, or refuses to link depending on firmware.” If your environment is production-critical, I’d sanity-check compatibility against your exact Juniper switch (and, ideally, validate with one unit before you commit). If you’re running lots of these, the best value is when you can keep them consistent and confirmed—otherwise you risk spending more time troubleshooting than the £ savings were worth.

TP-Link
TP-Link TL-SM321A V3 - SFP (mini-GBIC) transceiver module - 1GbE - 1000Base-BX - LC/UPC single-mode - up to 20 km - 1310 (RX) / 1550 (TX) nm

STARTECH
StarTech.com Cisco GLC-LH-SMD Compatible SFP Module, 1000BASE-LX/LH, 1GbE Single Mode (SMF) Fiber SMF Optic Transceiver, 1GE Gigabit Ethernet, LC Connector, 10km 1310nm, Firepower, ASR920 (GLCLHSMD10ST) - SFP (mini-GBIC) transceiver module (equivalent to: Cisco GLC-LH-SMD) - 1GbE - 1000Base-LX, 1000Base-LH - LC - up to 10 km - 1310 nm (pack of 10)

STARTECH
StarTech.com Juniper EX-SFP-10GE-SR Compatible SFP+ Module, 10GBASE-SR, 10GbE Multimode Fiber MMF Optic Transceiver, 10GE Gigabit Ethernet SFP+, LC Connector, 300m, 850nm, DDM, Mini GBIC - Lifetime Warranty (EXSFP10GESRS) - SFP+ transceiver module (equivalent to: Juniper EX-SFP-10GE-SR) - 10GbE - 10GBase-SR - LC multi-mode - up to 300 m - 850 nm

TP-Link
TP-Link TL-SM5110-SR - SFP+ transceiver module - 10GbE - 10GBase-SR - LC/UPC multi-mode - up to 300 m - 850 nm - for JetStream TL-SG3428X, TL-SG3452XP V1