1.5.4. Reception (ISDN)
G4 Reception:
Data from the ISDN line passes to the SAF memory first. Then the data is
decompressed at the DCR block in the SCP, and sent to the page memory.
After a page of data has been stored in the page memory, the data is sent to
the LDDR through the LCP for printing.
G3 Reception from the ISDN:
Data from the ISDN line first passes to the modem through the codec, where
it is converted into an analog signal. After the modem demodulates the data,
the DCR block in the SCP decompresses the data from either the FIFO or the
ECM memory.
At the same time, the demodulated data is backed up in the SAF memory, in
case of mechanical problems during printing (this is known as substitute re-
ception).
The decompressed data is then passed 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 LCP for printing.
Scanner
NCU
Printer
Interface
Printer
(LDDR)
CiG4-SV
CiG4
CODEC
Buffer
Memory
MFCE
Modem
SAF
Memory
Line Buffer
VPP4F
LPC
Page
Memory
ECM
Memory
FIFO
SCP
DCMMR
DCR
From
ISDN
H515V505.wmf
December 21st, 1995
OVERALL MACHINE INFORMATION
VIDEO DATA PATH
1-19
