TN748D Tone Detector
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TN748D Tone Detector

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The TN748C/D has four Dual Tone Multi-Frequency (DTMF) receivers and two general purpose tone receivers to detect call progress tones, modem answer-back tones, transmission test tones, and noise. The circuit packs provide dial tone detection required for Automatic Route Selection (ARS), off-premises (out-of-building) keyboard dialing, and off-premises abbreviated dialing. Tones must be companded in Mu-Law code only.
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Provides four touch-tone receivers and two general purpose ton receivers to detect call progress tones, modem answer-back times, transmission test tones, and noise
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