t recovery for ring Ethernet-based topology; provides consistent application performance for applications such as VoIP.- Remote configuration and management: is available through a secure Web browser or a command-line interface (CLI). IEEE 802.1ab LLDP discovery: advertises and receives management information from adjacent devices on a network. USB support: File copy: allows users to copy switch files to and from a USB flash drive . DHCP options: - DNS Relay and SMTP Redirection. - DHCP: Server (RFC 2131), Client, and Option-82 Relay (RFC 3046). sFlow: provides scalable, ASIC-based networkmonitoring and accounting; this allows network operators to gather a variety of sophisticated network statistics and information for capacity planning and real-time network monitoring purposes.- High-density port connectivity: supports up to 84 1-Gigabit ports per unit/612 per stack. Auto-MDIX: automatically adjusts for straight-through or crossover cables on all 10/100 ports. Jumbo frames: on Gigabit Ethernet and 10-Gigabit ports, have maximum frame length of 9K; allow high-performance remote backup and disaster-recovery services. IEEE 802.3af Power over Ethernet (PoE): provides up to 15.4 W per port to IEEE 802.3af-compliant PoE-powered devices such as IP phones, wireless access points, and security cameras. IEEE 802.3at Power over Ethernet (PoE+): provide up to 30 W per port that allows support of the latest PoE+-capable devices such as IP phones, wireless access points, and security cameras, as well as any IEEE 802.3af-compliant end device; eliminates the cost for additional electrical cabling and circuits that would otherwise be necessary in IP phone and WLAN deployments.- Hardware-based wire-speed access control lists (ACLs): feature-rich ACL implementation (TCAM-based) helps ensure high levels of security and ease of administration without impacting network performance. Unique Flex-Chassis Architecture: supports the best of both fixed chassis and modular configurations.- Data center–optimized design: HP 5800AF-48G Switch (JG225A) supports front-to-back/back-to-front airflow for hot/cold aisles, rear rack mounts, and redundant hot-swappable AC or DC power and fans.- Full-featured console: provides complete control of the switch with a familiar command-line interface (CLI). Web interface: allows configuration of the switch from any Web browser on the network. RMON and sFlow: provide advanced monitoring and reporting capabilities for statistics, history, alarms, and events. Multiple configuration files: allow multiple configuration files to be stored to a flash image. Troubleshooting: Ingress and egress port monitoring: enable network problem solving. Tracert and Ping: enable testing of network connectivity. Virtual Cable Tests: provide visibility to cable problems.