The Catalyst 4003 switch is a three-slot switch designed for high-performance, high-density wiring closet applications such as wired and wireless PC connections, multicast streaming applications (such as IPTV), and gigabit to the desktop.  It has a Gigabit Ethernet port and a 12-Gbps non-blocking, full duplex switching fabric that provides connections between the supervisor engine and the switching modules. The Catalyst 4003 supervisor engine has a 10BASE-T Ethernet management port (RJ-45 connector) and a console port (DCE DB-25 connector).  The Catalyst 4003 chassis has three slots for online swappable modules. Slot 1 is reserved for the supervisor engine, which provides switching, local and remote management, and switch-status monitoring. Slots 2 and 3 are available for switching modules.