SFP and QSFP Transceivers
Transceivers are the plug-in optics and copper modules that give a switch port or network card its physical link. SFP modules cover 1GbE, SFP+ covers 10GbE, SFP28 covers 25GbE, and QSFP+ and QSFP28 cover 40GbE and 100GbE. Within each speed, short reach (SR) modules run over multimode fiber for links inside a rack or room, and long reach (LR) modules run over single-mode fiber for longer distances. Both ends of a link need matching wavelength and fiber type. The other thing to check is vendor coding: many switches from Cisco, Arista and others only accept optics coded for that vendor, while most network cards are less strict. Check the listing for module type, reach and coding, and ask us if you are unsure which module your switch accepts.
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Tell us what you needSFP and QSFP Transceivers: common questions
Will a Cisco coded SFP work in another brand of switch?+
Sometimes. Some switches accept any coding, others reject optics coded for a different vendor or need a setting to allow them. Network cards are usually less strict. Tell us your switch model and we will check before you buy.
What is the difference between SR and LR optics?+
SR optics use multimode fiber and suit short links inside a rack or building. LR optics use single-mode fiber for longer runs. Both ends must match, and the fiber must match the optic.
Can I put an SFP+ module in an SFP28 port?+
Many SFP28 ports accept SFP+ modules and run at 10GbE, and some accept 1GbE SFPs. Check your switch or card documentation, since support varies by model.