Carrier Routing System

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Cisco CRS-1 Backbone Core Router

Carrier Routing System is a large-scale core router, developed by Cisco Systems, Inc. It runs IOS XR which is a train of IOS built upon the QNX microkernel. A single chassis holds a maximum of 16 line cards, and can run an OC-768 SONET interface. The system has the capability for combining multiple line card chassis using separate dedicated fabric chassis, allowing one system to replace a cluster of Internet core routers in a single site. In this multi-chassis configuration, each line card chassis (LCC) is connected over multiple fabric switching planes with one or more fabric card chassis (FCC). The chassis interconnections are achieved with PAROLI (parallel optical link) fiber optic bundles.

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