This diagram was hand drawn by Robert M. Metcalfe and photographed by Dave R. Boggs in 1976 to produce a 35mm slide used to present Ethernet to the National Computer Conference in June of that year. On the drawing are the original terms for describing Ethernet.

Further information about the origins of Ethernet can be found in the reprinted from "Communications of the ACM" of Ethernet: Distributed Packet Switching for Local Computer Networks by Robert M. Metcalfe and David R. Boggs.