OSN
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This article is about a German phone operating system. For the Orquesta Sinfónica Nacional (Peru), see National Symphony Orchestra (Peru).
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OSN or Operating System Nucleus, is the operating system used in German Alcatel's telephone switches. It runs on x86 processors. Boards running OSN have three simultaneously blinking LEDs, at a frequency of about 4 Hz, on the front panel. OSN was developed by the R&D center in Stuttgart.
OSN runs about 40% of Germany's telephone switches. Siemens is a competitor to Alcatel on this market.
