SFP modules are standardised, but they are not universal. Learn what has to match for a module to work in your switch, how vendor coding works and how to pick the right compatible module.

What an SFP transceiver does, which types exist, what SX, LR or BX on the label mean and how to choose the right module – without the jargon.

SFP is 1G, SFP+ 10G, SFP28 25G, QSFP+ 40G and QSFP28 100G. A side-by-side guide to the module sizes and what can be combined with what.

Compatible transceivers are built to the same standard, coded for your equipment and cost a fraction of brand-name optics. How to choose a good supplier.

SX for short multimode links, LX for 10 km, EX for 40 km, ZX for 80 km, T for copper and BX for a single fiber. Which 1G SFP fits your link.

SR for multimode links up to 300 m, LR for 10 km, ER for 40 km, ZR for 80 km – plus 10G copper and DAC. Which 10G SFP+ fits your link.