Ports: 24 x SFP Other ports: 4 x 10/100/1000BASE-T, 4 x SFP combo Free module slots: - Stackable: Yes Managed: Yes Form factor: Rack-mount Power supply: Internal Ventilation: fans Alleid Telesis AT-9000 Series Managed Gigabit Ethernet ECO-Switch, 28x 10/100/1000T SFP ports, 4x Combo 10/100/1000 Gigabit LAN ports (shared with SFP ports 25 - 28), Eco-friendly