The 3Com Switch 5500-EI 28-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. 24-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.