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13.4.1 Circuit operation
●
On hook
Q101 is open, Q101 is connected as to cut DC loop current and cut the voice signal.
●
Off hook
Q101 turns on thus providing an off-hook condition (active DC current flow through the circuit)
and the following signal flow id for the DC loop current. T
→
POS101
→
D101
→
Q101
→
Q108
→
R124
→
D106
→
D101
→
R
●
The receiving signal flows:
TEL line
→
POS101
→
Q101
→
C113
→
R125
→
C108
→
Q109
→
Q405
→
Q406
→
Speaker
●
The transmission signal flows
Mic
→
Q421
→
Q424
→
C435
→
R437
→
Q108
→
Pos101
→
Tel Line
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Summary of Contents for KX-TS2365RUB
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