Memory Transmission And Parallel Memory Transmission; Immediate Transmission; Jbig Transmission; Adjustments - Ricoh B156 Service Manual

VIDEO DATA PATH

Memory Transmission and Parallel Memory Transmission

The base copier's scanner scans the original at the selected resolution in inch
format. The BICU processes the data and transfers it to the FCU.
NOTE: When scanning a fax original, the BICU uses the MTF, independent dot
erase and thresholding parameter settings programmed in the fax unit's
scanner bit switches, not the copier's SP modes.
Then, the FCU converts the data to mm format, and compresses the data in MMR
or raw format to store it in the SAF memory. If image rotation will be done, the
image is rotated in page memory before compression.
At the time of transmission, the FCU decompresses the stored data, then re-
compresses and/or reduces the data if necessary for transmission. The NCU
transmits the data to the line.

Immediate Transmission

The base copier's scanner scans the original at the resolution agreed with the
receiving terminal. The BICU video processes the data and transfers it to the FCU.
NOTE: When scanning a fax original, the BICU uses the MTF, independent dot
erase and thresholding parameter settings programmed in the fax unit's
scanner bit switches, not the copier's SP modes.
Then the FCU stores the data in page memory, and compresses the data for
transmission. The NCU transmits the data to the line.

JBIG Transmission

• Memory transmission: If the receiver has JBIG compression, the data goes
from the DCR to the QM-Coder. Then the NCU transmits the data to the line.
When an optional G3 unit (SG3) is installed and PSTN2 is selected as the line
type, JBIG compression is available, but only for the PSTN-2 line.
• Immediate transmission: If the receiver has JBIG compression, the data goes
from the page memory to the QM-Coder. Then the NCU transmits the data to the
line. When an optional G3 unit (SG3) is installed and PSTN2 is selected as the
line type, JBIG compression is available, but only for the PSTN-2 line.

Adjustments

• Priority for the line used for G3 transmissions (PSTN 1/PSTN 2 or 3): System
switch 16 bit 1
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10 February 2005
SM