The Cisco Catalyst 4500 series Supervisor Engine IV provides integrated redundancy for non-blocking Layer 2/3/4 switching, extending control to the edge of the converged network. A highly available voice/video/data converged network provides business continuity for enterprises and metropolitan Ethernet customers deploying Internet-based enterprise applications. As a key component of Cisco AVVID (Integrated Voice, Video, and Data Architecture), the Cisco Catalyst 4500 series extends control to the network edge with intelligent network services including advanced Quality of Service (QoS), predictable performance, advanced security, comprehensive management, and integrated redundancy provided by the Supervisor Engine IV. The Cisco Catalyst 4500 series modular architecture, flexibility, and scalability enable extended deployment windows in converged networks. This approach reduces redundant operating expenses, lowers ownership costs, and improves return on investment (ROI).