D-LINK DGS-3420-52P, 48-ports PoE 10/100/1000Base-T L2+ Stackable Management Switch with 4-ports SFP+, Redundant power supply support DPS-700, administrator-definable port security, 176Gbps switching fabric, IGMP snooping, ISM VLAN, Spanning Tree 802.1D/802.1w/802.1s MSTP, STP Loopback Detection, E-RPS, 802.3ad Link Aggregation port trunks of up to 32 groups/8, Traffic segmentation, 802.1Q VLAN, GVRP, Selective Q-in-Q, Private VLAN, Voice VLAN, 802.1V Protocol VLAN, Bandwidth Control Down to 64Kbps, Per Flow Bandwidth Control, Port Mirroring. 802.1p/Multi-Layer CoS, IP v.4/v.6 Static Routing, RIP(Further firmware), 802.1x port-based/MAC-based access control, MAC-IP-Port Binding, ACL ingress max 6 profiles and 256 rules, egress max 4 profiles and 256 rules, SSH/SSL, Port security, SIM support, Web-based management, CLI, Telnet, SNMP v.1, v.2c, v.3