Foundation for the IP Next-Generation Network

The Cisco CRS-1 Carrier Routing System marks a new era in carrier IP communications by powering the foundation for network and service convergence today while protecting investments for decades to come. With an innovative and massively scalable multishelf architecture, the Cisco CRS-1 Multishelf System delivers the service flexibility, continuous system operation, and system longevity of the Cisco CRS-1 platform, scaling from 640 Gbps to 92 Tbps while in service with no service disruption.
The Cisco CRS-1 Multishelf System:

Consists of 2 to 72, 40-Gbps-per-slot line-card shelves and 1 to 8 fabric shelves for a total switching capacity of up to 92 Tbps

Supports in-service upgrade from single-shelf to multishelf configuration with the addition of 1 to 8 fabric shelves

Protects investments by using modular services cards (MSCs) and physical layer interface modules (PLIMs) that are fully interchangeable across the entire CRS-1 product family

Supports up to 1152 slots for MSCs, PLIMs, and distributed route processors

Features line-card shelves that are connected only to the fabric-card shelves where Stage 2 of the three-stage switching process is performed supporting true fabric shelf redundancy, service-intelligent fabric queuing, and massive multicast replication scale