The Catalyst 4000 Series provides an advanced enterprise switching solution for wiring closets and data centers. The Catalyst 4000 Series provides intelligent Layer-2 services leveraging a 24 Gbps bandwidth architecture for 10/100/1000-Mbps Ethernet Switching. The modular three-slot Catalyst 4003 extends the same feature set with identical software code base along with the same enterprise functionality as the Catalyst 5500/5000 Series, delivering a consistent end-to-end solution.Catalyst 4000 Series Ethernet switches offer a broad range of density and functionality. These switches are available in a chassis-based form factor with flexible modular configurations that provide a broad range of port densities for 10/100 Mbps to 1000 Mbps speeds.