Quick overview from the supplier:
TP-LINK TL-SG3452 48-port Pure-Gigabit L2 Managed Switch, 48 10/100/1000Mbps RJ45 ports including 4 combo SFP slots, Port/Tag/MAC/Voice/Protocol-based VLAN, GVRP, STP/RSTP/MSTP, IGMP V1/V2/V3 Snooping, L2/L3/L4Traffic Classification
