The 3Com Switch 5500G Gigabit Family delivers Premium levels of performance, security and reliability for robust switching at the enterprise Network edge. The family consists of Layer 2/3/4 Gigabit Ethernet and Power over Ethernet switches, With advanced features that can accommodate the Most demanding applications, offering resilient and Secure connectivity and the latest traffic-prioritization Technologies to optimize applications on converged networks. Designed for maximum flexibility and scalability,3Com Switch 5500G models come with 24 or 48 Gigabit ports ,and offer optional modules for10- Gigabit and SFP Gigabit up link connections .