Oki B4100 Maintenance Manual Download

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40055101TH Rev.4

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(3) G3 receive Mode

Figure A2.1.3 (For OKIOFFICE 44/OKIFAX 4100)/Figure A2.2.3 (For OKIFAX 5000 series)
show the G3 receive picture signal route

In the G3 mode, the high-speed picture signal arriving from the telephone line at L1 and L2 of
NCU passes through the transformer T1 and the amplifier and is input to the MODEM as “R”
signal. After demodulation by modem, the picture data is sent to CPU. The CPU performs the
picture data processing (decode) for this picture data and stores into the DRAM. Then, the stored
picture data is again written into DRAM (as a page memory) by the picture processing control of
CPU. When the data for one page has been stored in the DRAM/P-SRAM, the data is read out
from the DRAM and sent to IOGA. The picture data is converted into a signal data by the printer
control of IOGA and transferred to the LED print head for printing as HDATA 0/1.

(4) 300bps Send Mode

Figure A2.1.4 (For OKIOFFICE 44/OKIFAX 4100)/Figure A2.2.4 (For OKIFAX 5000 series)
show 300bps send protocol signal route

In G3 communication, this is the route of the procedural control signals (pre-message, post-
message phases etc.) at 300bps.

The protocol send data is read into DRAM in the sequence the contents of varrious data stored in
the FLASH memory area in advance under the control of CPU. The contents of the frame has
been edited on the DRAM by CPU and sent to MODEM via CPU. HDLC (high level data link
control) frame of the data is structured by the modem and converted to serial data in synchrony
with the modem’s DCLK (data clock). After modulation, the protocol signal is output from “S” of
the modem and sent to the telephone line L1 and L2 via the transformer T1 of NCU.

(5) 300bps Receive Mode

Figure A2.1.5 (For OKIOFFICE 44/OKIFAX 4100)/Figure A2.2.5 (For OKIFAX 5000 series)
show 300bps receive protocol signal route.

In G3 communication, this is the route of the procedural control signals (pre-message, post-
message phases etc.) at 300bps.

The 300bps modulated signals received via the telephone line L1 and L2 of the NCU are sent from
pin R to Pin RXA1 of the modem. After demodulation by the modem, the demodulated digital
signals are sent to the CPU via the data bus from the modem. The data is read and decoded by the
CPU and written into the DRAM. The written data is interpreted according to bit assigment of the
binary procedural signals in the ITU recommendations. The successive modes of communication
(for example, line density,encoding scheme, etc.) are determind.

(6) Report Printing

This signal route describes the printing route of character data used to print Activity Report,
Message Confirmation Report, etc.

The report data is read into DRAM in the sequence the contents of data stored in the FLASH
memory in advance under the control of CPU. The contents of data is edited on the DRAM. The
data is read out from the DRAM and sent to IOGA. The data is converted into a serial data by the
picture control of IOGA and transferred to the LED print head for printing as HDATA 0/1.

Oki B4100, Maintenance Manual

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