Canon FAX-L1000 - Manual (Page 214)

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FAX-L1000 Chapter 3: Technical Reference
b-2) CODEC IC (IC 22)
The main functions of the CODEC IC are as follows:
•Scanner interface
• Serial interface to image processing IC
•Encoder
•Decoder
•Printer interface
• Serial interface port for the SCNT printer interface
b-3) SRAM (IC 21)
A 256-kbit SRAM is used as a buffer for the image processing data.
c) Communication control section (SCNT board)
The communication control section consists of the following components and controls
facsimile communication.
c-1) MODEM IC (IC 26)
A Context R288F is used as the modem IC. The MODEM IC carries out G3 modulation
conforming to ITU-T standards V.34, V.33, V.17, V.29, V.27ter and V.21 on transmitted
data received from the MPU during transmission. During reception, the MODEM IC
carries out G3 modulation on received signals from the telephone line, according to the
same standards.
d) Printer interface section (SCNT board)
The printer interface section consists of the following components and controls the printer
section by conversion data from the system control section into print data and printer
control commands.
d-1) System controller (IC 18)
The system controller has the following printing system image processing function.
•LBP video interface
•Line buffer control
•Smoothing processing
•Reduction processing
•WPD (Window Pattern Diffusion)
• Eliminate image defects when an image is reduced by the error diffusion method