DETAILS: The 3Com Switch 5500-EI 52-Port is a premium stackable 10/100 switch with Enhanced Image software for businesses running the most demanding network applications requiring the highest "five 9s" network uptime. 48-ports operate at 10/100 while four additional SFP-based ports operate at Gigabit speeds. Supports distributed, resilient 3Com XRN stacking technology and advanced Layer 3 (RIP / OSPF) routing, Layer 2-4 QoS, and rate limiting features. Includes extensive security features - SNMP v3, SSH, network login. Runs 3Com Operating System common to 3Com premium switches. Product Description 3Com Switch 5500-EI - switch - 48 ports Device Type: Switch - stackable Form Factor: External Dimensions (WxDxH): 17.3 in x 10.6 in x 1.7 in Weight: 7.3 lbs Localization: United States Ports Qty: 48 x Ethernet 10Base-T, Ethernet 100Base-TX Data Transfer Rate: 100 Mbps Data Link Protocol: Ethernet, Fast Ethernet Empty Slots: 4 x SFP (mini-GBIC) Remote Management Protocol: SNMP 1, SNMP 2, RMON 1, Telnet, SNMP 3 Features: Flow control, layer 3 switching, DHCP support, auto-negotiation, VLAN support, IGMP snooping, stackable, 3Com XRN Technology Compliant Standards: IEEE 802.3, IEEE 802.3u, IEEE 802.3i, IEEE 802.3z, IEEE 802.1D, IEEE 802.1Q, IEEE 802.3ab, IEEE 802.1p, IEEE 802.3af, IEEE 802.3x, IEEE 802.3ad (LACP), IEEE 802.1w, IEEE 802.1x, IEEE 802.3ae, IEEE 802.1s Power: AC 120/230 V ( 50/60 Hz ) Manufacturer Warranty: Limited lifetime warranty ALTERNATE ITEM #: 3CR17162-91-US UPC: 0662705487991