South African Engineer Koos Koen Recognized for Pioneering National Public Data Network

Koos Koen an engineer originally from Kakamas is celebrated as a key architect in the development of South Africa's first public data network SAPONET. Working alongside peers in the 1970s Koen successfully challenged state telecommunications monopolies by demonstrating early internet technologies which eventually led to critical legislative changes and the modernization of the nation's digital infrastructure.

By: AXL Media

Published: Feb 15, 2026, 3:24 PM EST

Source: Information for this report was sourced from MyBroadband

The Early Technical Milestones of Koos Koen

Born in the Northern Cape town of Kakamas Koos Koen pursued his academic foundations at Stellenbosch University where he graduated with degrees in science and engineering in 1966. His early professional career took him to London where he achieved a landmark technical feat for the era. Koen successfully connected a Telex machine to an IBM System 370 mainframe marking one of the first instances of bridging these distinct communication technologies.

By 1970 Koen returned to South Africa to join the Department of Posts and Telecommunications. At this time the South African Post Office maintained a rigid monopoly on all telecommunications services and the law prohibited the sharing of leased lines between different organizations. This regulatory environment created a significant barrier for the development of shared data networks which were beginning to emerge in the United States and Europe.

The Strategic Demonstration of ARPANET Technology

The turning point for South African networking occurred through Koen’s international connections within the International Federation for Information Processing. It was here that he established a relationship with Vinton Cerf a primary designer of the ARPANET. In 1974 Cerf visited South Africa carrying a 600 bit per second acoustic coupler in his hand luggage to facilitate a high stakes demonstration of packet switching technology.

Koen and his colleague Gert van der Veer organized a secret session for the head of the South African Post Office to showcase the future of connectivity. By using the acoustic coupler to dial into a university computer in London they proved that data could be transmitted efficiently over shared lines. This demonstration was the primary catalyst for the eventual amendment of the Post Office Act which finally legalized the sharing of network lines and broke the state’s absolute control over data transmission.