KX-TC1005RUC, KX-TC1005RUB, KX-TC1005RUW - Panasonic Telephone Service Manual (repair manual). Page 43

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5. RESONARCE PREVENTION CIRCUIT
Ring signal frequency : 16~60Hz.
The Ring signal frepuency is between 16 to 60Hz at IC201 1 (CPU), it is judged as a High signal.
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