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• EOR and ERR
When there is an error frame however many times the same block is trans-
mitted (when an error occurs even if the image transmission speed is
delayed), the transmitter outputs the EOR to cancel re-transmitting of that
block. Canon facsimiles do not output EOR until a fallback to 2400 bps is
made. EOR is first output when the re-transmit is continued at 2400 bps
and PPR is received. When the transmitter receives ERR, DCN is output to
disconnect the telephone line as fallback beyond the current image trans-
mission speed is impossible.
Calling Side (transmitter)
Block transmission
1st re-transmit of block
2nd re-transmit of block
3rd re-transmit of block
"Shall cancel
re-transmitting
of this block."
Line disconnected
G3 FACSIMILE COMMUNICATIONS
Frame 0
Frame 1
2400bps
Frame 255
PPS-NULL
PPR
Frame
Frame
2400bps
Frame
PPS-NULL
PPR
Frame
Frame
2400bps
Frame
PPS-NULL
PPR
Frame
Frame
2400bps
Frame
PPS-NULL
PPR
EOR
ERR
DCN
Fig. 5-88 EOR and ERR
Called Side (receiver)
Error present
Error present
Error present
Error present
"I understand."
Line disconnected
5–129
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ït
çi
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