- Timeline of Communication Systems: Introduction
- 4000 - 1000 B.C.
- 1000 B.C. - 0
- 0 - 1400 A.D.
- 1400 - 1500 A.D.
- 1500 - 1700 A.D.
- 1700 - 1800 A.D.
- 1800 - 1900 A.D.
- 1900 - 2000 A.D.
- 2000 A.D.
- More and more, faster and faster, but...
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Sputnik
At the beginning of the story of today's global data networks is the story of the development of  satellite communication.
In 1955 President Eisenhower announced the USA's intention to launch a satellite. But it was the Soviet Union, which launched the first satellite in 1957: Sputnik I. After Sputnik's launch it became evident that the Cold War was also a race for leadership in the application of state-of-the-art technology to defence. As the US Department of Defence encouraged the formation of high-tech companies, it laid the ground to Silicon Valley, the hot spot of the world's computer industry.
In the same year the USA launched their first satellite - Explorer I - data were transmitted over regular phone circuits for the first time, thus laying the ground for today's global data networks.
Today's satellites may record weather data, scan the planet with powerful cameras, offer global positioning and monitoring services, and relay high-speed data transmissions. But up to now, most satellites are designed for military purposes such as reconnaissance.
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