The Cisco 4-Port OC-12c/STM-4 POS Shared Port Adapter is available on high-end Cisco Systems routing platforms offering the benefits of network scalability with lower initial costs and ease of upgrades. The Cisco 4-Port OC-12c/STM-4 POS Shared Port Adapter continues the Cisco focus on investment protection along with consistent feature support, broad interface availability, and the latest technology. The Cisco 4-Port OC-12c/STM-4 POS Shared Port Adapter allows different interfaces (Packet over SONET/SDH [POS], ATM, Ethernet, and so on) to be deployed on the same interface processor.