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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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