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    *  Hardware die Binärdaten(0/1) in analoge Singnale(high/low) wandelt und zürück
    * Modulator/ Demodulator
    * Bits werden durch wechselnde Amplitude, Frequenz oder Phase einer Sinuskurve dargestellt
    * Bit rate: bits per second (in bps)
    * Baud rate: signal units per second (in baud)
    * Signal unit: signal to represent a bit (or bits)
    * Bit rate >= baud rate