24 10/100/1000 Base-T port with 4 x 1000Base-T /SFP ports - 24 x 10/100/1000Mbps Auto-Negotiating Port - 4 x Combo 10/100/1000Mbps/100/1000Mbps SFP Port - Switching Capacity 56 Gbps - Advance power saving features - Max power consumption 16.81 Watts - Fanless design - Half-/Full-Duplex, auto-negotiation, Auto MDI/MDIX - IEEE 802.3x Flow Control - 802.3ad Link Aggregation - 802.1D/802.1w/802.1s Multiple Spanning Tree - Asymmetric VLAN, Auto Voice/Surveillance 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 - Static Routing and Default Route - D-Link Safequare Engine - Smart Console Utility, web based management, compact CLI - Dual Image - D-View 6.0 support - 19" Rackmount Installation - IEEE 802.3az EEE - Firmware Release 6 not backward compatible tp Hardware Version C1.