The Cisco Catalyst 4500 Series modular architecture provides a “pay-as-you-grow” model, reducing operational expenses and capital expenditures. The Supervisor Engine V-10GE is backward-compatible with all classic Cisco Catalyst 4500 Series line cards and can be used in both the classic Cisco Catalyst 4500 chassis with the Cisco Catalyst 4503, 4506, 4507R, and 4510R Switch chassis as well as the Cisco Catalyst 4500 E-Series Chassis: Cisco Catalyst 4503-E, 4506-E, 4507R-E, 4507R+E, 4510R-E, and 4510R+E Switches.