The Cisco 7304 SPA MSC is designed to enable two single-height SPAs in one line-card slot of the Cisco 7304. This greatly extends the port density on the current Cisco 7304 chassis and offers customers flexible interface deployment options making the Cisco 7304 Router an ideal platform for service provider or enterprise customers who need high-density aggregation at the edge with a small footprint. The Cisco 7304 SPA MSC offers: - Increased interface density and modularity through SPAs for the Cisco 7304 Router - Ability to add new interfaces such as modular Fast Ethernet and Gigabit Ethernet - Investment protection for customers deploying next-generation interfaces