The support of SONET ring interfaces in the Prisma IP system enables network operators to deploy high bandwidth, managed services over legacy networks. Designed to integrate smoothly into existing networks, Prisma IP allows operators to derive the greatest performance and revenue potential from existing SONET/SDH infrastructures.Resilient Packet Ring (RPR) and MPLS technologies enable network operators to offer high revenue voice, video, and data services to residential and business customers. The bandwidth efficiency, resiliency, and simple end-to-end provisioning allow operators to more quickly and cost-effectively deploy new services.The Prisma IP ring I/O card is the main optical transceiver interface between the Prisma IP shelf and the optical transport network. Each RPR ring I/O card supports two pluggable optic modules transmitting and receiving packet data to and from adjacent nodes.