This product is either discontinued or we cannot get that from suppliers.
Brand Name: Cisco, Product Line: Catalyst, Product Series: 4500, Product Model: WS-C4503-E, Product Name: Catalyst WS-C4503-E Chassis, Product Type: Switch Chassis, Port/Expansion Slot Details: 3 x Expansion Slot, Number of Total Expansion Slots: 3, Expansion Slot Type: Line Card, Supervisor Engine, Layer Supported: 4, Manageable: Yes, Power Source: Power Supply, Redundant Power Supply Supported: Yes, Compatible Rack Unit: 7U, Form Factor: Rack-mountable
Cisco Catalyst 4503-E chassis offers 3 slots with Fan, one for supervisor engine slot, two for line-card slot with supporting up to 100 ports and up to 1500W POE power per slot.