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TN748C Tone Detector 63123C
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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. Provides dial tone detection required for the Automatic Route Selection (ARS) feature, off-premises (out-of-building) keyboard dialing, and off-premises abbreviated dialing. Replaced by TN2182B Tone-Clock, Tone Detector, and Call Classifier.
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