The Catalyst 4003 provides an advanced high-performance enterprise switching solution optimized for wiring closets with up to 96 10/100 Fast Ethernet ports, or up to 36 Gigabit Ethernet ports in a single chassis. New FlexiMod uplinks support up to eight 100BASE-FX riser connections with EtherChannel benefits. The Catalyst 4003 provides intelligent Layer 2 services leveraging a multiGigabit architecture for 10/100/1000-megabit Ethernet switching. The modular three-slot system leverages the software code base from the Catalyst 5000/5500 series in order to provide the rich and proven feature set for true end-to-end enterprise networking solutions. The Catalyst WS-C4003-S1 comes standard with an AC power supply, fan tray and Supervisor Engine I module already installed into one unit.