Investment Protection Critical components of the Cisco® Catalyst® 4500 E-Series Switch are upgradability and field replaceability, including line cards, supervisor engines, power supplies, and fans. In addition, forward and backward compatibility of supervisor engines and line cards reduce capital expenses and lower the overall cost of ownership. For example, Cisco Catalyst 4000 Series line cards shipped in 1999 are compatible with the Cisco Catalyst 4500 E-Series Supervisor Engine 6-E today and can enable all the advanced features it has to offer.
Minimized Network Disruption
Redundant power supplies, supervisor engines, and fans combined with functionally transparent line cards and Nonstop Forwarding with Stateful Switchover create a solid foundation to build a mission-critical network. To minimize network disruptions, full-image In-Service Software Upgrade (ISSU)
allows customers to upgrade or downgrade complete Cisco IOS® Software images* for new line cards, power supplies, features, or bug fixes with minimal effect on the network.
Network Security
The Supervisor Engine 6-E and Cisco IOS Software provide advanced detection and mitigation of Layer 2 and Layer 3 network attacks with no degradation in switching performance. Scalability Up to 250 Mpps non-blocking performance independent of the number of security policies or Layer 3 or Layer 4 services (up to 128K entries) enabled. Unified Communications Advanced Quality of Service (QoS) with 8* queues per port, low latency, large buffers, and the ability to scale up to 384 10/100/1000 Power over Ethernet (PoE) ports within a single chassis optimize the E-Series for convergence.
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Polycom SoundStation VTx 
Cisco authorized refurbished 3750-24PS
Unified Communications for Small Businesses
CISCO IP Phone 7962G
