H3C A5120-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.