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G3 FACSIMILE COMMUNICATIONS
6.10.2 Structure of ECM image signals
The content of coded images is the same as that in general G3 communica-
tions. Fills, however, are not required as the image data is basically com-
municated by memory transmission and reception.
numbered from 0 to 255.
• Frames
A single frame comprises 256 bytes, and each frame is appended a number
within the range 0 to 255.
• Partial page
Documents containing little data can fit into a single block. However, doc-
uments that comprise data of 64 kbytes or more become multiple blocks.
The single block of these multiple blocks are referred to as a "partial
page."
• Final frame
A single block comprises up to 256 frames and is 64 kbytes. However, the
final frame is sometimes a block that contains less than 256 frames. In
cases where the final frame is 256 bytes or less in partial pages of less than
256 frames, 0's are inserted in the section following RTC.
• RCP
The end of each block is appended with the RCP frame. The end of partial
pages midway during single pages and the end of frames to be re-transmit
are also appended with RCP.
6.10.3 ECM error control procedure
• PPS-Q
The transmitting side outputs PPS-Q when transmission of a single block
ends. PPS-Q is the partial page Q signal, in other words, the end of the
block. Different signals, however, are output for when there is a following
block and for when the block is the final block.
5–126
PPS-NULL
Transmitted when the next block is present in multiple
blocks
PPS-EOP
In the final block of a single page, EOP changes to
PPS-EOM
EOM or MPS depending on state of next document.
PPS-MPS
Each frames are
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