Routing switch with 24 x 10/100/1000 gigabit Ethernet ports, including 2 shared SFP ports. Stacking, up to 8 units (ERS 4500/ERS 4800 mixed stacks supported). Switches deliver high-performance, resilient Ethernet connectivity for wiring closet and network edge deployments. Featuring stacking technology with twice the virtual bandwidth of leading competitors, superior energy efficiency, and ease of operation, the Ethernet routing switch 4000 can address the most demanding converged edge requirements. Support for PoE/PoE+, plug-and-play for IP phones and sophisticated QoS can help businesses consolidate voice, video, and data on a single infrastructure and ensure the network is ready for advanced collaboration applications or technologies.