"24-Port 10/100/1000BASE-T PoE + 4-Port 1 Gbps SFP Ports Metro Ethernet Switch - 24 x 10/100/1000BASE-T PoE ports - 4 x 1 Gbps SFP ports - Switching Capacity 56 Gbps - PoE Capable Ports 1-24 - PoE Power Budget 193W - Layer 3 Features: H/W Ver. B1 IPv4/IPv6 Interface (Max. 4 IPv4/IPv6 Interfaces), Static Route, Max. 128 ARP Entries, Supports 255 static ARP entries - Layer 2 Features: Supports IEEE 802.3ad Link Aggregation (Supports max. 8 groups, 8 ports per group), Port-based Q-in-Q, Lookback detection, Spanning Tree Protocols: 802.1D STP, 802.1w RSTP, 802.1s MSTP, 16K MAC address table and Jumbo Frame up to 9,216 Bytes - Quality of Service (QoS) – Bandwidth Control, Queue handling, 8 outbound queues - Management: Web-based GUI (IPv4/IPv6), Full Command Line Interface (CLI) through Telnet, SSH and the console port, D-Link Network Assistant Utility (DNA) - Access Control Lists (ACLs) Security: SSH, Port security (up to 64 MAC addresses per port), IP-MAC-Port Binding (IMBP), Broadcast/Multicast/Unicast storm control, IP Inspection, (IP source Guard), Duplicate Address Detection (DAD), D-Link Safeguard Engine, BPDU/DoS attack prevention, Traffic segmentation - VLAN: Asymmetric VLAN, Voice VLAN, GVRP, Private VLAN, ISM VLAN (multicast VLAN), VLAN trunking - Access Control, Authentication for management access (local/RADIUS/TACACS+) - MTBF 331,669 hours - Acoustic: High speed: 52.9 dB(A), Low speed: 45.3 dB(A) - Ventilation: 2 x Smart Fans - Weight 3.34 kg - 19-inch standard rack-mount width. 1U height. Dimension 440x210x44mm - Surge protection ".