vBNS Testnet
The Testnet has stayed one step ahead of the vBNS. Originally it was a network consisting of DS-3 and OC-3 links carrying IP over ATM.
Today it is an OC-3/OC-12 network with OC-12 links connecting nodes located at SDSC; PSC; and an MCI lab in Richardson, TX, and an OC-3 link connecting to a node located at an MCI lab in Reston, VA.