54-Port Lite Layer 3 Stackable Managed Gigabit Fiber Switch DGS-3130-54S Lite Layer 3 stackable managed switch for a secure enterprise or metro Ethernet access network. 48 x SFP ports 2 x 10GBASE-T and 4 x 10G SFP+ ports provide all the uplink capacity your network needs Premium L2 and L3 features effortlessly improve network efficiency and reduce unnecessary data transfer High 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 loops RIP/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 units 80 Gbps per device physical stacking bandwidth The Smart Fan self-adjusts accordingly to maintain optimal operating temperatures.