The Cisco OC-12 / STM-4 packet-over-SONET / SDH line card is a high-capacity, high-performance interface that enables service providers to substantially increase the data load on their existing fiber networks. The OC-12 / STM-4 is ideal for edge feature support and can be configured with multimode and single mode intermediate reach optics enabling customers to connect directly to traditional SONET / SDH solutions.