WOODEN TOUCH TONE PHONE   » DecoSet-230 «   DEUTSCHE TELEKOM   (1990)
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This nice telephone has Transistors, ICs & buzzer inside. The KEY-PAD
generates DTMF (= DUAL-TONE-MULTI-FREQUENCY ) used in modern Tel.Nets
or can be set to produce PULSE-DIAL ( IWV ) used in old Tel.Nets:
             See INSTRUCTION (in German) ...




German Terminology:
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Pulse-Dial / German: "IWV" = ImpulsWahlVerfahren
Tone-Dial  / German: "MFV" = MehrFrequenzVerfahren

                        Historical Remarks ...
impressum:
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© C.HAMANN        http://public.BHT-Berlin.de/hamann         11/07/24