The Cisco® Interface Flexibility (I-Flex) design combines shared port adapters (SPAs) and SPA interface processors (SIPs), taking advantage of an extensible design that facilitates service prioritization for voice, video, and data services. SPAs provide the physical interfaces for router connectivity ranging from copper, channelized, POS, ATM and Ethernet. The Cisco® ASR 1000 Series SIP provides the physical termination for the SPAs and accepts up to four half-height and 2 full height Cisco SPAs. Enterprise and service provider customers can take advantage of improved slot economics resulting from modular port adapters that are interchangeable across Cisco routing platforms. The I-Flex design maximizes connectivity options and offers powerful service intelligence through programmable interface processors that deliver line-rate performance. I-Flex enhances speed-to-service revenue and provides a rich set of quality-of-service (QoS) features for premium service delivery while effectively reducing the overall cost of ownership. Figure 1 shows a sample of the wide range of SPAs supported on the Cisco ASR 1000 Series and Figure 2 shows the Cisco WebEx™ node for the Cisco ASR 1000 Series. Figure 3 shows the Cisco ASR 1000 Series SPA Interface Processor.