"28-Port Gigabit PoE Smart Switch including 4 SFP Ports - 24 x PoE 10/100/1000Mbps Auto-Negotiating Ports - 4 x 1000BaseT SFP ports - Port 1-4 802.3at up to 30W - Port 5-24 802.3af up to 15.4W - Switching Capacity 56 Gbps - Advance power saving features - Fanless design - Half-/Full-Duplex, auto-negotiation, Auto MDI/MDIX - IEEE 802.3x Flow Control - 802.3ad Link Aggregation - Asymmetric VLAN, Auto Voice VLAN - 802.1p priority queues - MAC/IP filtering - MAC/IP-based ACL 200 rules (Port List) - 802.1X port-base Access Control, Port Security - LLDP, LLDP-MED, Smart Binding, Traffic Segmentation - IPv6 configurations - D-Link Safequare Engine - Smart Console Utility, web based management, compact CLI - D-View 6.0 support - 19"" Rackmount Installation - IEEE 802.3az EEE - 440mm x 210mm x 44mm – 2.9 Kg"