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.
Reference: http://www.cisco.com/en/US/products/ps5842/index.html
