Nokia DX200

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The DX200 is a digital telephone switching exchange developed by Nokia and now marketed by Nokia Siemens Networks.

[edit] History

The DX-200 was the first microprocessor controlled telephone exchange and the first fully digital exchange to be taken into service in Europe. Development of the system started at Televa, the Finnish state owned telecom equipment producer in the early 1970s, under the leadership of Keijo Olkkola. The first order was received in 1973 for a 100 subscriber local exchange for the small and remote island community of Houtskär, to be delivered in 1979.[1] After the first installation in 1982, the DX-200 captured a 50% share of the Finnish fixed line exchange market. The exchange's modular design and development of microprocessors technology enabled a gradual increase in the system's capacity.[2] By 1987 the installation base had grown to 400,000 subscriber lines.[3] Early export markets included China, Nepal, United Arab Emirates, Sri Lanka, Sweden, Turkey[3] and the Soviet Union. In 1984 development of a version of the exchange for the Nordic Mobile Telephone network was started.[4]

[edit] References

  1. ^ Knut Holt Market Oriented Product Innovation: A Key to Survival in the Third Millennium
  2. ^ Automaattisten puhelinkeskusten historia (Finnish)
  3. ^ a b Robert J. Chapuis 100 Years of Telephone Switching
  4. ^ OVERCOMING A TECHNOLOGICAL DISCONTINUITY The case of the Finnish telecom industry and the GSM
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