tw telecom inc. is a national provider of managed network services, specializing in business Ethernet, data networking, Converged, Internet protocol-based virtual private network (IP VPN), Internet access, voice, including voice over Internet Protocol (VoIP), and network security services to enterprise organizations, including public sector entities, and carriers throughout the United States, including their global locations. Its revenue is derived from business communication services, including data, high-speed Internet access, network and voice services. Through its subsidiaries, the Company serves 75 United States metropolitan markets. As of December 31, 2011, its fiber network spanned approximately 27,000 route miles (including approximately 21,000 metropolitan route miles), connecting to 15,438 buildings served directly by its local fiber facilities. The Company serves both business enterprise and carrier customers.