After four years and $500 million in investments, Cisco Systems unveiled its high-end router--but it could be six months to a year before it starts seeing any revenue from the product.

The router, dubbed the Carrier Routing System-1 (CRS-1), is designed for carrier networks that handle the highest volumes of Internet traffic. It is the first product engineered by Cisco that will allow several boxes to be clustered together to function as a single router.

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