n 1973, Robert Kahn and Vinton Cerf collaborate to develop a protocol for linking multiple networks together. This later becomes the Transmission Control Protocol/Internet Protocol (TCP/IP), a technology that links multiple networks together such that, if one network is brought down, the others do not collapse. While working at Xerox, Robert Metcalfe develops a system using cables that allows for transfer of more data over a network. He names this system Alto Aloha, but it later becomes known as Ethernet. Over the next few years, Ted Nelson proposes using hypertext to organize network information, and Unix becomes popular for TCP/IP networks. Tom Truscott and Steve Bellovin develop a Unix-based system for transferring data over phone lines via a dial-up connection. This system becomes USENET.