D-link 24-Port Gigabit PoE Smart Managed Switch with 4 x Combo 1000BaseT/Mini-GBIC SFP ports - 24 x 10/100/1000Mbps Auto-Negotiating Ports - 4 x Combo 1000BaseT/Mini-GBIC SFP ports - Max PoE budget 193 Watts - Fanless design - Half-/Full-Duplex, auto-negotiation, Auto MDI/MDIX - IEEE 802.3x Flow Control - 802.3ad Link Aggregation - Asymmetric VLAN, Auto Voice VLAN - Auto Surveillance VLAN - 802.1p priority queues - MAC/IP filtering - MAC/IP-based ACL - 802.1X port-base Access Control, Port Security - D-Link Safeguard Engine - Smart Console Utility, web based management - Switching capacity 56 Gbps - D-View 7.0 support - 19" Rackmount Installation