Cisco SPA-4XOC12-POS Module
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The Cisco SPA-4XOC12-POS is a quad-port OC-12/STM-4 Packet over SONET/SDH (POS) Shared Port Adapter designed for high-capacity backbone and metro aggregation networks. Each port delivers 622 Mbps full-duplex, providing an aggregate throughput of 2.488 Gbps across four interfaces. It supports SONET/SDH framing, PPP and HDLC encapsulation, MPLS transport, and rapid protection switching, ensuring carrier-class reliability and low-latency packet delivery. The module is ideal for service provider deployments that require scalable, resilient optical transport for IP, MPLS, and Layer 2 traffic. Fully compatible with Cisco SPA-capable routing platforms, it offers modular flexibility, high availability, and streamlined integration into existing SONET/SDH infrastructure.