Ports   26 x 10/100/1000 + 2 x combo Gigabit SFP  Power Supply AC 120/230 V ( 50/60 Hz )  Others Maximum data transfer rate 1 Gbit/s     Supported data transfer rates Supported data transfer rates     MAC address table 8000 entries     Networking features Ethernet, Fast Ethernet, Gigabit Ethernet     Networking standards IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3z, IEEE 802.3x, IEEE 802.1D, IEEE 802.1Q/p, IEEE 802.1w, IEEE 802.1s, IEEE 802.1X, IEEE 802.3af, IEEE 802.3at     Management protocols SNMP 1/2c/3, RMON, HTTP/HTTPS, TFTP, DHCP, SSH, RADIUS, BOOTP, SNTP     Ports quantity 28     Copper ethernet cabling technology 10BASE-T/100BASE-TX/1000BASE-T     Rack mounting 19"     Dimensions (WxDxH) 440 x 257 x 44.45 mm