The Cisco 1-, 2-, and 4-Port OC-48c/STM-16c POS/RPR Shared Port Adapter (SPA) is a versatile networking component available on high-end Cisco routing platforms. 

Purpose and Benefits:

• • The SPA combines shared port adapters (SPAs) and SPA interface processors (SIPs) to enable prioritization of voice, video, and data services.
  • It offers network scalability with lower initial costs and easy upgrades.
  • The Cisco I-Flex design maximizes connectivity options and provides programmable interface processors for line-rate performance.
  • Investment protection, consistent feature support, broad interface availability, and leading-edge technology are key features of the SPA.

Deployment and Interfaces:

• • Different interfaces (such as POS, ATM, etc.) can be deployed on the same carrier card using the SPAs.
  • The Cisco 1-, 2-, and 4-Port OC-48c/STM-16c POS/RPR SPAs use Small Form-Factor Pluggable (SFP) interfaces.
  • SFP modules are available in short-reach (2 km), intermediate-reach (15 km), and long-reach (80 km) optics.

Applications:

• • The SPA can be used in various scenarios, including:
    • Access and aggregation
    • WAN uplinks
    • Internet peering
  • It supports both packet over SONET/SDH for mesh fiber networks and Resilient Packet Ring (RPR) for ring fiber topologies.

Key Features and Benefits:

• • Modular and Flexible: The SPA/SIP portfolio offers unmatched flexibility, allowing different interface types on the same interface processor for consistent services, independent of access technology.
  • Programmable Interface Processors: These processors provide flexibility for the service diversity required in next-generation networks.

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