7.10. ITS (Integrated Telephone System) AND MONITOR SECTION
7.10.1. GENERAL
During the monitor operation, the speaker output passes through the power amplifier (IC102)
[Analog board].
The DTMF signal is output from the modem (IC505: digital board). The alarm tone, the key tone,
bell tone, and beep are output from gate array IC501 (digital board). During a pulse dial operation,
the monitor tone is output from gate array IC501.
7.10.2. TELEPHONE MONITOR
1. Function
This is the function when you are not holding the handset and can
hear the caller’s voice from the line.
2. Signal path
Refer to CHECK SHEET ().
7.10.3. HANDSET CIRCUIT
1. Function
This circuit controls the conversation over the handset, i.e. the
transmitted and received voices to and from the handset.
2. Signal path (Transmission signal)
Refer to CHECK SHEET ().
3. Signal path (Reception signal)
Refer to CHECK SHEET ().
7.10.4. MONITOR CIRCUIT
1. Function
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