Panasonic KX-MB2061CXB Service Manual page 30

KX-MB2061CXB/KX-MB2061CX2/KX-MB2062CXB
6.3.4. TEL Line Section
Composed of ITS circuit and NCU circuit.
6.3.4.1. Description of Block Diagram in Analog Section
Function
The analog section works as an interface between the telephone line and controls ITS circuit and NCU circuit.
The analog section control signals are output from BBIC (IC902).
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; Remote fax activation circuit.
Refer to NCU Section (P.39) for the details.
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