21 May, 1999
VIDEO DATA PATH
1-15
1.5.2 RECEPTION
Data from the line passes to the modem through the NCU and hybrid integrated
circuit (HIC). After the modem demodulates the data, it passes through the ECM
memory, DCR buffer, then to the DCR (or the JBIG LSI), which decompresses it
into raster image data. At the same time, the compressed data passes to the SAF
memory as a backup in case of mechanical problems during printing (substitute
reception).
During G4 reception, data from the ISDN line passes to the DCR for
decompression.
The raster image data then passes to the page memory for printing. After a page of
data has been stored in the page memory, the data is sent to the LDDR through
the LIF.
F C U
From PSTN
H I C
M o d e m
FCIP05
D C R
LIF
Data/ Address Bus
D R A M
E C M / D C R
Buffer
P a g e
M e m o r y
Copy Paper
LDDR
S A F
M e m o r y
Line
Buffer
N C U
JBIG
SiG4
From ISDN
H547V510.WMF
