In 1984, the National Science Foundation began work on establishing five new supercomputer centers, including the Cornell Center for Advanced Computing, to provide high-speed computing resources for research within the United States. In 1985, a team from the National Center for Supercomputing Applications began the development of NSFNet, a TCP/IP-based computer network that could connect to the ARPANET, at the Cornell Center for Advanced Computing and the University of Illinois at Urbana-Champaign. This high-speed network, unrestricted to academic users, became a backbone to which regional networks would be connected. Initially a 56-kbit/s network, traffic on the network grew exponentially; the links were upgraded to 1.5 Mbit/s T1s in 1988 and to 45 Mbit/s in 1991. The NSFNet was a major milestone in the development of the Internet and its rapid growth coincided with the development of the World Wide Web.