KX-TEB308CA, KX-TE82460X, KX-TE82493X, KX-A227X - Panasonic PBX Service Manual (repair manual). Page 13

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     KX-TEB308CA/KX-TE82460X/KX-TE82493X/KX-A227X
3) Pulse dial transmission circuit
When the Off hook status, pulse dial transmission is executed by alternating On hook and Off hook. The status of On hook or Off
hook is controlled by the switching transistor Q10. 
4) CALL ID interface circuit
  It is insulated by the capacitors in a COL circuit, and the call ID signal inputted from outside line is transmitted to a CALLID
option card.
The flow of a CALLID signal 
Tip
→L1→C29→R54→IC4
Ring
→L1→C29→R55→IC4
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