Panasonic KX-FP101AL Service Manual page 164

KX-FP101AL
6.9. ITS (Integrated telephone System) and MONITOR SECTION
6.9.1. GENERAL
The general ITS operation is performed by the special IC511 which has a handset circuit. The alarm tone, the key tone, and the
beep are output from the ASIC IC501 (digital board). During the pulse dial operation, the monitor tone is output from the ASIC
IC501.
6.9.2. 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 2.3.3.5. Analog Board Section.
6.9.3. 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 2.3.3.5. Analog Board Section.
3. Signal path (Reception signal)
Refer to 2.3.3.5. Analog Board Section.
6.9.4. MONITOR CIRCUIT
1. Function
This circuit monitors various tones, such as a. DTMF tone, b. Alarm/Beep/Key tone/Bell c. Dummy ring back tone.
2. Signal path
a. DTMF MONITOR
(Speaker Operation)
Refer to 2.3.3.5. Analog Board Section.
(Handset Operation)
Refer to 2.3.3.5. Analog Board Section.
b. ALARM/BEEP/KEY TONE/BELL
Refer to 2.3.3.5. Analog Board Section.
c. DUMMY RING BACK TONE
Refer to 2.3.3.5. Analog Board Section.
6.9.5. REMOTE RECEIVING
This is the parallel-connected DTMF signal for the TEL mode between T and R. When the other party is a FAX, the unit switches
to FAX receiving.
(Signal Path)
Detects the DTMF signal in the MODEM.
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