H3C S5120-SI series Gigabit Ethernet switches are access/distribution layer switches that deliver wire-speed throughput and a host of performance-enhancing, management and availability-maximizing features to optimize delivery of your mission-critical data. Additionally, quality of service (QoS) eliminates jitter and dropped calls, and ensures that end users experience no quality issues. Also, link aggregation offers a cost-effective way to expand the bandwidth of a switch port and increases overall network reliability. Meanwhile, robust security protocols address today's sophisticated threats, including combinations of attacks to penetrate enterprise networks that previously may have been considered secure.H3C S5120-SI series Gigabit Ethernet switches are intelligent, manageable layer 2 switches that provide high performance, high-density port access and simplified installation to maximize the value of your network infrastructure investment. These switches are typically deployed at the access layer in enterprise networks that require Gigabit Ethernet to the desktop or at the distribution layer in metropolitan area networks (MANs).