D-Link DXS-3400 Series Lite Layer 3 Stackable 10 GbE Managed Switches Compact, high-performance switches that feature wire speed 10-Gigabit Ethernet switching, routing, and ultra-low latency. 24x 10GBASE-T LAN port 4x combo SFP+ slot (shared with LAN ports 21-24) Modular power supplies (1x redundant, 2nd PSU sold separately) and fan modules (Smart fan)