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GENERAL DESCRIPTION OF A FACSIMILE
2.4
NCU board (Network Control Unit board)
The NCU board is a kind of relay board for interfacing the telephone line
to facsimile equipment. This unit detects the calling identification signal
(for ringing the bell on the called party's telephone) that arrives from the
telephone line to perform control of connection to the telephone or the
modem.
2.5
System Control Section
The role of this control section includes the control of all facsimile devices
(mainly the CPU, program ROM and memory), data processing and saving
of data.
Generally, the system control section corresponds to the electrical circuit
boards called the SCNT board or IP board mounted on Canon facsimiles.
2–22
T1
T2
Telephone line
L1
L2
Fig. 2-20 NCU board Location
System
NCU
MODEM
board
section
Facsimile
control
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