Editing Xerox Network Systems (section)

===Origins in Ethernet and PUP===
In his final year at [[Harvard University]], [[Robert Metcalfe|Bob Metcalfe]] began interviewing at a number of companies and was given a warm welcome by [[Jerome I. Elkind|Jerry Elkind]] and [[Robert Taylor (computer scientist)|Bob Taylor]] at [[Xerox PARC]], who were beginning to work on the networked computer workstations that would become the [[Xerox Alto]]. He agreed to join PARC in July, after defending his thesis. In 1970, while [[couch surfing]] at [[Steve Crocker]]'s home while attending a conference, Metcalfe picked up a copy [[Joint Computer Conference|Proceedings of the Fall Joint Computer Conference]] off the table with the aim of falling asleep while reading it. Instead, he became fascinated by an article on [[ALOHAnet]], an earlier wide-area networking system. By June he had developed his own theories on networking and presented them to his professors, who rejected it and he was "thrown out on my ass."{{sfn|Pelkey|2007|loc=6.7}}

Metcalfe was welcomed at PARC in spite of his unsuccessful thesis, and soon started development of what was then referred to as "ALOHAnet in a wire". He teamed up with [[David Boggs]] to help with the electronic implementation, and by the end of 1973 they were building working hardware at 3&nbsp;Mbit/s. The pair then began working on a simple protocol that would run on the system. This led to the development of the [[PARC Universal Packet]] (Pup) system, and by late 1974 the two had Pup successfully running on Ethernet. They filed a patent on the concepts, with Metcalfe adding several other names because he believed they deserved mention, and then submitted a paper on the concept to [[Communications of the ACM]] on "Ethernet: Distributed Packet Switching for Local Computer Networks", published in July 1976.{{sfn|Pelkey|2007|loc=6.7}}