File:Diagram of busy tone Germany System 55 till systemchange.jpg

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Description Telephone: Diagram of the historical German busy tone of the System 55 till Systemchange. 2 x Sinus, 475 Hz. Tone 125 ms, pause 475 ms - period length 600 ms.
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Source own work - eigenes Werk
Author René Böke (Paulchen-Weimar)

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current15:16, 19 November 2007Thumbnail for version as of 15:16, 19 November 20071,817 × 342 (67 KB)Paulchen-Weimar~commonswiki (talk | contribs){{Information |Description=Telephone: Diagram of the historical German busy tone of the System 55 till Systemchange. 2 x Sinus, 475 Hz. Tone 125 ms, pause 475 ms - period length 600 ms. |Source=own work - eigenes Werk |Date=2007-11-19 |Author= Paulchen-We

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