D-link 54-Port Lite Layer 3 Stackable Managed Gigabit Switch DGS-3130-54TS48 x 10/100/1000BASE-T ports2 x 10GBASE-T and 4 x 10G SFP+ ports provide all the uplink capacity your network needsPremium L2 and L3 features effortlessly improve network efficiency and reduce unnecessary data transferHigh redundancy features to provide professional-grade reliability and a longer product life:— Dual power inputs— Ethernet Ring Protection Switching with <50ms recovery time— 6 kV surge protection protects the device and those connected from unexpected surges— 802.1d/w/s Spanning Tree Protocol avoids potentially network crippling loopsRIP/RIPng and OSFPv2/v3 dynamically maps out your network, aiding data to get to its destination via the fastest route possible.Expand capacity in a flash with physical stacking up to 9 units80 Gbps per device physical stacking bandwidthThe Smart Fan self-adjusts accordingly to maintain optimal operating temperatures