11
KX-TG1070FXB/KX-TG1070FXC/KX-TG1072FXB/KX-TGA107EXB/KX-TGA107EXC
4.5. Signal Flow
4.5.1. Talk mode:
Rx audio signal from line interface at “LINERX_P” path into B/S MCU (pin 32, 33) and then signal from B/S RF transform, H/S RF
receive signal forward to MCU, H/S MCU from (pin 32, 33) receive path output audio signal to receiver.
Tx audio signal from MIC receive audio signal at mic path into H/S MCU and then audio signal from H/S RF transform, B/S RF
receive signal forward to MCU, B/S MCU audio signal from (Pin 30, 29) at “LINETX_P” path transmit to line interface out of PSTN.
4.5.2. Ringer detect:
Telephone line have ringer signal from tip ring into Base, and then Base transistor Q8 turn on and ringer data signal for Base MCU
(Pin 58_IOGP16) detect and the handset buzzer have product “Melody tone”.
4.5.3. Type I CID receive:
CID signal from tip ring couple CID signal at (CID1_P, CID1_N) path into Base MCU (Pin 29, 30) detect, Handset display show the
telephone no.
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