The picture data for one-line is transferred from DRAM/P-SRAM to CPU. The CPU performs the picture
data processing (encode) for this picture data (FILLER, fill bits are inserted) and again stored into the
DRAM/P-SRAM. The stored encoded data is output from DRAM/P-SRAM to the MODEM under the
control of CPU. After modulation, the picture signal S (TXOUT) is sent to the NCU board as the
transmission data. The transmission data S goes through the amplifier and is sent to the telephone line L1
and L2 via the transformer T1 as high speed signal.
3.6.03 G3 receive Mode
Figure 3.7.5 (For OKIFAX 1050)/Figure 3.8.5 (For OKIFAX 2350/2450) 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 (for OKIFAX 1050)/P-SRAM (for OKIFAX
2350/2450), Then, the stored picture data is again written into DRAM/P-SRAM (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/P-SRAM 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.
3.6.04 300bps Send Mode
Figure 3.7.2 (For OKIFAX 1050)/Figure 3.8.2 (For OKIFAX 2350/2450) 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 (for OKIFAX 1050)/P-SRAM (for OKIFAX 2350/2450) in the
sequence the contents of various 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/P-SRAM 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 modems 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.
3.6.05 300bps Receive Mode
Figure 3.7.3 (For OKIFAX 1050)/Figure 3.8.3 (For OKIFAX 2350/2450) 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 and sent from pin R
to Pin RXIN 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/P-SRAM. The written data is interpreted according to bit assignment of the binary procedural
signals in the ITU recommendations. The successive modes of communication (for example, line density,
encoding scheme, etc.) are determined.
3.6.06 Report Printing
This signal route describes the printing route of character data used to print Activity Report,
Message Confirmation Report, etc.
Summary of Contents for OF1050
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Page 65: ...Figure 2 3 1 Unpacking Procedure 2...
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Page 152: ...Case 2 Canceling member s from a group...
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Page 224: ...NCUU Package Layout OKIFAX 1050 2350 2450 Figure 3 10 1 Block Diagram of NCUU...
Page 319: ...Figure 6 14 1 Protocol Dump Data Sample at transmitter side...
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Page 337: ...Page 185 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 5 No Local Copy...
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Page 351: ...Page 191 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 11 LED Test...
Page 365: ...Page 201 Service Guide OF1050 2350 2450 Chapter 7 Troubleshooting and Repair 7 21 Document Jam...
Page 388: ...Page 218 Service Guide OF1050 2350 2450 Chapter 8 Drawings and Parts List OKIFAX 1050...
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Page 395: ...Section 1 Cabinet Illustratio n Number OKIFAX Description Okidata Part Number Oki Part Number...
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