These Gigabit Ethernet switches deliver outstanding security, reliability, & multiservice support capabilities for robust switching at the edge or aggregation layer of large enterprise & campus networks, or in the core layer of SMB networks. The HP 5500 EI Switch Series is comprised of Layer 2/3 Gigabit Ethernet switches that can accommodate the most demanding applications & provide resilient & secure connectivity as well as the latest traffic prioritization technologies to enhance applications on convergent networks. With complete IPv 4/IPv 6 dual-stack support, the series provides a migration path from IPv 4 to IPv 6 & has hardware support for IPv 6. Designed for increased flexibility, these switches are available with 24 or 48 Gigabit Ethernet ports. Power over Ethernet (Po E) & non-Po E models are available with optional Gb E & 10 Gb E expansion capability. The all-fiber model with dual power supplies is ideal for applications that require the highest availability. High expandability for investment protection Premium security & integrated management Multilayer reliability Convergence-ready support Outstanding Quality of Service (Qo S)