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XEROX DFC165 & DWC165c Service Manual
2.3.3 Block Diagram of the Network Control Unit Board
The NCU (Network Control Unit) board acts as the physical interface with the
telephone line. The NCU board is available in several versions, to suit the specific needs
of each country.
The figure shows the block diagram of a generic NCU board.
Fig. 2-12 Block diagram of a generic NCU board
TX
RX
Telephone line
Telephone
external TAD
interface
Current
detector
Receiver
detector
relay
Selector
relay
Selector
relay
Call
detector
Line
transf.
Amplifier
Motherboard
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