The Cisco SPA-2XOC3-POS Shared Port Adapter is a two-port Packet over SONET/SDH (POS) module for Cisco carrier-grade routers, delivering high-speed optical WAN connectivity in telecom networks, ISP backbones, and enterprise WAN deployments. Each port supports OC-3 / STM-1 at 155 Mbps, giving two optical interfaces for scalable long-distance data transport over fiber, with installation as a modular router interface card on Cisco platforms that support SPA modules. The part number SPA-2XOC3-POS identifies this shared port adapter, designed for interface upgrades, network expansion, and replacement of legacy WAN modules in Cisco routing environments.
