Ethernet Turns 52: How a 1973 Xerox Memo Built the Backbone of Modern Networking

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Ethernet was invented in May 1973 by engineer Robert Metcalfe at Xerox's Palo Alto Research Center (PARC), where researchers needed a way to connect experimental personal computers to a shared laser printer. Metcalfe designed a system using a single shared cable with a collision-detection protocol, later formalized as CSMA/CD, co-developed with colleague David Boggs. The technology's name was inspired by the 19th-century physics concept of the 'luminiferous ether,' an imagined medium for carrying light, which Metcalfe used as a metaphor for a medium carrying data. Standardized as IEEE 802.3, Ethernet has evolved from speeds below 3 Mbps to multi-gigabit performance while retaining its original core architecture, including the 48-bit MAC address scheme. Metcalfe was awarded the Turing Award in 2022 for the invention, which remains foundational in data centers, industrial automation, and IoT infrastructure worldwide.

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