The Cisco I-Flex design combines OC-3/STM-1 POS Shared Port Adapter using an extensible design that enables service prioritization for voice, video, and data services. Enterprise and service provider customers can use improved slot economics resulting from modular port adapters are interchangeable across Cisco routing platforms. The I-Flex design maximizes connectivity options and offers superior service intelligence through programmable interface processors, which 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. This data sheet contains the specifications for the Cisco 4/8-Port OC-3c/STM-1 Packet over SONET SPAs.