Toshiba DP120F Service Manual page 328

(1) The document data (coded data or raster data) sent from the PC is input to the PC
interface of the PTC GA (IC45) through the PC I/F PBA.
(2) The document data is transferred to the PIX-DRAM (IC25). During this period, the sys-
tem communicates with the destination to identify the coding for the data to be transmit-
ted.
(3) Only when the document data is coded data, the coded data is transferred through the
CODEC interface of the PTC GA to the CODEC (IC51) where it is decoded to raster data.
Then the raster data is transferred to the PIX-DRAM.
For PC indirect transmission, go to step (4).
For PC direct transmission, go to step (6).
(4) The raster data is transferred to the CODEC where it is coded to data in the JBIG format.
Then the JBIG coded data is transferred to the SYS-DRAM (DP120F: IC34, IC41/DP125F:
IC46). This allows the coded data for all the documents for transmission to be stored in
the SYS-DRAM.
(5) The JBIG coded data is transferred to the CODEC where it is decoded to raster data.
Then the raster data is transferred to the PIX-DRAM.
(6) The raster data is transferred to the CODEC where it is coded in accord with the coding
format (MH, MR, MMR or JBIG) specified by the destination. Then the coded data is
transferred to the SYS-DRAM. This allows one page of coded data to be stored in the
SYS-DRAM.
(7) The coded data is transferred to the MODEM (IC5) where it is modulated to an analog
signal for telephone lines. Then the modulated analog signal is sent to the telephone line
through the NCU PBA.
March 2000 © TOSHIBA TEC 7-19 DP120F/DP125F Circuit Description