Build a stronger access layer with the Extreme Networks 5520 48-port switch. Designed for enterprise environments that need dense fiber connectivity, this model delivers 48 1,000BASE-X SFP ports with MACsec capability, giving you the port count and link security required for modern campus and aggregation deployments. The switch is built for infrastructure teams that care about uptime and serviceability. Stacking/QSFP28 ports support scalable topologies, while one unpopulated VIM slot gives you room for future expansion. Three unpopulated modular fan slots and two unpopulated modular PSU slots add a level of operational flexibility that matters when you are planning for sustained load, maintenance windows, and redundancy requirements. AC or DC PSU capability makes the platform easier to align with site power standards, and the rack-mountable design fits cleanly into enterprise cabinets. This is the kind of switch you choose when access density, security, and long-term operational control matter more than entry-level simplicity.