The Cisco 4-Port OC-3c/STM-1 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-3c/STM-1 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-3c/STM-1 POS Shared Port Adapter is available with four Small Form-Factor Pluggable (SFP) interfaces.