SAVVIS (http://www.savvis.net/corp)

SAVVIS is one of the larggest network provider in US

SAVVIS operates an integrated global IP and transport network that delivers IP VPN, Voice Services, and Internet solutions for enterprises and carriers alike. The SAVVIS IP network spans 105 cities in 47 countries, encompassing the U.S., Canada, Latin America, Europe, The Middle East, Asia and the Pacific Rim.

SAVVIS Facilities Tour

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Cogent ( http://www.cogentco.com )

Cogent is ranked among the top five networks in the world.

Cogent's end-to-end optical network consists of multiple metropolitan IP-over-WDM fiber rings located in Cogent's major markets throughout the United States and Europe. Cogent currently has a presence in over 95 markets throughout North America and Europe. Cogent's network provides each building or data center with up to 5 Gbit/s of dedicated bandwidth. Layer 3 edge routers in each building are connected to Cisco Layer 3 Terabit core routers over two diverse optical paths. These core routers are tied together via an international backbone network consisting of multiple 10 Gbit/s DWDM optical links. With a currently implemented capacity of 80 Gbit/s in the United States and 40 Gbit/s in Europe, Cogent's international IP network is the largest in the world and is scalable to a total capacity of over one Terabit.