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13.5. Tone Detect
This circuit is used to sense the status of the line (busy tone or dial tone) during Auto Redial.
13.5.1. Circuit operation
D101 → Q101 → C201 → R201 → R205 → Pin 5 of IC201 → Pin 1 of IC201 → D202 → R208 → Q201
When the subscriber hangs-up, check the intermittent tone. If cycle tone is detected, the collector of Q201 goes to a low logic.
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KX-TS2365RUB
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