Circuit Operation (Base Unit) - Panasonic KX-TG3711BXB Service Manual

KX-TG3711BX/KX-TG3712BX/KX-TG3719BX/KX-TGA371BX
4.5.

Circuit Operation (Base Unit)

General Description:
(BBIC, EEPROM) is a digital speech/signal processing system that implements all the functions of speech compression and
memory management required in a digital telephone.
The BBIC system is fully controlled by a host processor. The host processor provides activation and control of all that functions
as follows.
RF part
EEPROM
IC611
4.5.1. BBIC (Base Band IC: IC501)
• DTMF Generator
When the DTMF data from the handset is received, the DTMF signal is output.
• Caller ID demodulation
The BBIC implements monitor and demodulate the FSK/DTMF signals that provide CID information from the Central Office.
• Digital Switching
The voice signal from telephone line is transmitted to the handset or the voice signal from the handset is transmitted to the
Telephone line, etc. They are determined by the signal path route operation of voice signal.
• Block Interface Circuit
RF part, Key scan, Telephone line.
4.5.2. Flash Memory (IC502)
Main program data is stored.
4.5.3. EEPROM (IC611)
Following information data is stored.
• Settings
ex: message numbers, ID code, Flash Time, Tone/Pulse
TDD & TDMA
with FHSS
Processor
Host CPU
BBIC (IC501)
Flash Memory
Keys/Charge
(Program)
IC502
ADPCM
Digital
Speech
ADPCM
Processor
Caller ID
Modem
12
TEL
Analog
Line
Front
Interface
End
&
Multi-
plexer