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This paper is a retrospective on the design of Xunet 2, one of the earliest functional wide-area ATM networks. Work on Xunet 2 began in 1989 and the network, consisting of experimental ATM switches, IP routers, and 45 Mbps transmission lines, has been operational since October 1991. The network serves as a "laboratory without walls" for eight research groups across the United States. While Xunet 2 has only a small number of nodes, it was designed as a prototype of a nationwide ATM network. Thisdoi:10.1109/90.554721 fatcat:ltcdt2ozdbapvhmgv2og4pjzom