Catalyst 4000 Series Ethernet switches are available in a chassis-based form factor, with flexible modular configurations providing a broad range of port densities for 10/100- to 1000-Mbps speeds. The Catalyst 4003 chassis offers: A flexible, three-slot modular chassis, with one slot reserved for a Supervisor Engine and two slots for switched port modules; Two power-supply bays that support redundant (option), load-sharing, fault-tolerant AC power supplies; One hot-swappable fan tray bay; Familiar Catalyst 5500/5000 look and feel with consistent interfaces and indicators.Up to 96 10/100 Fast Ethernet ports, or up to 36 Gigabit Ethernet ports, can be installed into one chassis. Performance is a blazingly fast 18 million packets-per-second throughput, with 24-Gbps switching bandwidth. Evolving to Gigabit Ethernet, either now or in the future, is easy because of the modular chassis flexibility and the variety of module speed mixes. In addition, the Catalyst 4003 will meet requirements for device redundancy, link resiliency, and network availability, providing dedicated bandwidth directly to individual users, as well as servers, printers, and high-speed connections to company servers. The powerful Catalyst 4003 will minimize congestion from growth and improve the response time of your network.Standard common equipment includes one chassis, one Supervisor Engine, one AC power supply, and one fan tray in a single manageable unit.