D-Link DGS-3420-28SC/B1A / Managed stackable Layer 3 switch with 20 ports 100 / 1000Base-X SFP , 4 combo ports 100 / 1000Base-T / SFP and 4 ports 10GBase-X SFP + VLAN: VLAN Group, 802.1Q Tagged VLAN, 802.1v Protocol VLAN, GVRP, MAC-based VLAN function, VLAN Trunking, 802.1Qbb, Voice VLAN / 100-240 V AC, 50 / 60Hz / 441mm x 310mm x 44mm