SFP+ Transceivers and DACs: Making Sense of Fiber and Copper Networking for Your Homelab
The managed-switch and 10GbE articles on this site both talk around one thing without ever explaining it: the actual port you plug 10GbE gear into usually isn’t RJ45. It’s SFP+, a small rectangular slot that takes a separate module, and that module is where most people buying their first piece of 10GbE gear get stuck. This is the piece that fills that gap: what SFP+ actually is, the three ways to fill one, and the specific mistakes that turn a cheap used switch into a pile of ports that won’t link up. ...