Panasonic KX-FLB802CX Service Manual page 23

KX-FLB802CX/KX-FLB812CX/KX-FLB802CXS/KX-FLB812CXS
6.3.4.2. DESCRIPTION OF BLOCK DIAGRAM IN ANALOG SECTION
Function
The analog section works as an interface between the telephone line.
The analog ASIC (IC209) on the analog board exchanges FAX TX and RX signals between the MODEM (IC607) and the analog
section.
The control signals transmitted to the analog section are output mainly from G/A IC604, and the analog status is stored as data
in G/A IC604.
Circuit Operation
[NCU]: Network Control Unit the NCU comprises of the following; DC loop forming circuit to connect with the telephone line;
Switching circuit for other interconnected telephones; Bell detection circuit; Side tone circuit; Remote fax activation circuit.
Refer to NCU SECTION (P.31) for the details.
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