Panasonic KX-FG2452CX Service Manual page 54

KX-FG2452CX
6.14.2.3. Signal Flowchart in the Whole System
Reception
CN507 of the base unit is connected to the line from TEL line. While talking, the signal through analog board and digital board,
then led to DSP (IC801). The DSP encodes ADPCM and TDD/TDMA with FHSS to TX-DATA. The TX-DATA signal is entered to
IC901 of RF UNIT, and modulated to 2.4GHz. The RF signal is fed into Tx/Rx switch (D903/D904). The RF signal is passed
through filter (FL901) and fed to ANTENNA.
As for the handset, RF signal from the antenna passes through filter (FL901), then is routed by Tx/Rx switch (D903/D904) and
led to IC901. The RF signal is amplified by LNA and down-converted to IF signal in IC901. The IF signal passing through inter-
nal filter is demodulated into RX-DATA, then enters DSP (IC201). The DSP performs TDD/TDMA and ADPCM decoding to con-
vert the RX-DATA into the voice signal, then it is output to the speaker.
Transmission
The voice signal entering from the microphone is led to DSP (IC201). The DSP encodes ADPCM and TDD/TDMA with FHSS to
TX-DATA. The TX-DATA signal enters IC901 of RF UNIT, and is modulated to 2.4GHz. The RF signal is fed into Tx/Rx switch
(D903/D904). The RF signal is passed through filter (FL901) and fed to ANTENNA.
As for the base unit, RF signal from the antenna passes through filter (FL901), then is routed by Tx/Rx switch (D903/D904) and
led to IC901. The RF signal is amplified by LNA and down-converted to IF signal in IC901. The IF signal passing through inter-
nal filter is demodulated into, then enters DSP (IC801). The DSP performs TDD/TDMA and ADPCM decoding to convert the
RX-DATA into the voice signal. The voice signal is outputted to the TEL line through digital board and analog board.
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