1.5.3. Transmission (ISDN)
G4 Immediate Transmission:
Scanned data passes to the VPP4F, where the data undergoes analog/digital
video processing, and is sent to the DCR block in the SCP through the
DCMMR for compression.
The DCR block then compresses the data into MMR format, and passes it to
the CiG4-SV board for G4 transmission.
G4 Memory Transmission:
The video processed data from the VPP4F passes to the DCMMR block in
the SCP, where the data is compressed into MMR format or kept as raw data,
then stored in the SAF memory.
At the time for transmission, the DCMMR block decompresses the data from
the SAF memory, then the DCR block compresses it again into MMR format.
The MMR compressed data then passes to the CiG4-SV board for transmis-
sion.
G3 Transmission over an ISDN:
The analog data is converted into PCM (Pulse Coded Modulation) format in
the codec, then sent over the ISDN.
Parallel Memory Transmission:
This feature allows the machine to scan a document into the SAF memory
and to send the same document simultaneously.
The machine stores the processed video data in the SAF memory and sends
the data through the CiG4 board at the same time.
Refer to section 2.3.3 for more details about this feature.
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
To
ISDN
G3
G4
H515V504.wmf
OVERALL MACHINE INFORMATION
December 21st, 1995
VIDEO DATA PATH
1-18
