Reception - Gestetner A265 Service Manual

VIDEO DATA PATH

1.4.2 RECEPTION

NCU-2
Modem
QM-
CODER
CCP
Decompression
SG3
First, the FCU stores the incoming data from either an analog line or an ISDN line
to the SAF memory. (The data goes to the FACE at the same time, and is checked
for error lines/frames.)
The FCU then decompresses the data and transfers it to page memory. If image
rotation will be done (see section 2-2-2), the image is rotated in the page memory.
The data is transferred to the BiCU.
If the optional G3 unit is installed, the line that the message comes in on depends
on the telephone number dialed by the other party (the optional G3 unit has a
different telephone number from the main fax board).
Note that ISDN G3 rx is not possible on the PSTN-2 line.
JBIG Reception
When data compressed with JBIG comes in on PSTN-1 (the standard analog line),
the data is sent to the EXFUNC board for decompression. Then the data is stored
in the page memory, and transferred to the BiCU.
When data compressed with JBIG comes in on PSTN-2 (optional extra analog
line), the data is sent to the QM-CODER on the SG3 board for decompression.
A265/A267
CÓPIA NÃO CONTROLADA
Analog G3
NCU
FCU
Modem
SAF Memory
FACE
Decompression
(DCR)
Image Rotation
Page Memory
FACE
(VIF)
BiCU
Printer
1-10
CÓPIA NÃO CONTROLADA
ISDN G3
CiG4
EXFUNC Board
QM-CODER
(Optional)
Error Check
JBIG
compression
ISDN G4
CiG4
FACE
(DCR)
A895V502.WMF
SM