The Cisco Interface Flexibility (I-Flex) design combines shared port adapters (SPAs) & SPA interface processors (SIPs), taking advantage of an extensible design that helps enable service prioritization for voice, video, & data services. Enterprise & service provider customers can take advantage of enhanced slot economics resulting from modular port adapters that are interchangeable across Cisco routing platforms. The Cisco I-Flex design maximizes connectivity options & offers superior service intelligence through programmable interface processors that deliver line-rate performance. Cisco I-Flex enhances speed-to-service revenue & provides a rich set of quality-of-service (Qo S) features for premium service delivery while effectively reducing the overall cost of ownership.