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KX-TG8075RUJ/KX-TG8075RUS/KX-TG8075RUT/KX-TG8076RUS/KX-TG8076RUT/KX-TGA807RUJ/KX-TGA807RUS/KX-TGA807RUT/KX-TGA809RUS/KX-TGA809RUT
4.5.
Signal Flow
Note:
• BU: Base Unit
• HS: Handset
• HS: Handset
4.5.1.
Talk mode:
Rx audio signal from line interface is received at “LINERX_P” path into the BU MCU (pin 45) and then signal from the BU RF is
transformed, and the HS RF receives the signal and forwards it to MCU, and the signal received at the HS MCU (pin 40, 41) is sent
to receiver.
transformed, and the HS RF receives the signal and forwards it to MCU, and the signal received at the HS MCU (pin 40, 41) is sent
to receiver.
Tx audio signal from MIC is received at mic path into the HS MCU and then audio signal from the HS RF is transformed, and the BU
RF receives the signal and forwards it to MCU, and the BU MCU receives the audio signal from Pin 40 at “LINETX_P” path and
transmits it to line interface out of PSTN.
RF receives the signal and forwards it to MCU, and the BU MCU receives the audio signal from Pin 40 at “LINETX_P” path and
transmits it to line interface out of PSTN.
4.5.2.
Speakerphone Mode:
Rx signal from line interface is received at “LINERX_P” path into the BU MCU (pin 45) and then signal from the BU RF is trans-
formed, and the HS RF receives the signal and forwards it to MCU, and the signal received at the HS MCU (pin 40, 41) is sent to
speaker phone IC (U2) to be amplified for speaker output.
formed, and the HS RF receives the signal and forwards it to MCU, and the signal received at the HS MCU (pin 40, 41) is sent to
speaker phone IC (U2) to be amplified for speaker output.
Tx audio signal from MIC is received at mic path into the HS MCU and then audio signal from the HS RF is transformed, and the BU
RF receives the signal and forwards it to MCU, and the BU MCU receives the audio signal from Pin 40 at “LINETX_P” path and
transmits it to line interface out of PSTN.
RF receives the signal and forwards it to MCU, and the BU MCU receives the audio signal from Pin 40 at “LINETX_P” path and
transmits it to line interface out of PSTN.
4.5.3.
Ringer detect:
Telephone line catches ringer signal from tip ring into base unit, and then the base transistor Q8 turns on and ringer data signal for
the BU MCU (Pin 54) is detected and the handset speaker/base buzzer produces “Melody tone”.
the BU MCU (Pin 54) is detected and the handset speaker/base buzzer produces “Melody tone”.
4.5.4.
Type I CID receive:
CID signal from tip ring is coupled at (CID1_P, CID1_N) paths and the BU MCU (Pin 37, 38) detects it, then Handset display shows
the telephone no.
the telephone no.
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