Canon fax basic 2000 サービスマニュアル

5–129

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G3 FACSIMILE COMMUNICATIONS

• 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.

Fig. 5-88 EOR and ERR

PPR

PPS-NULL

ERR

EOR

DCN

2400bps

PPR

PPS-NULL

2400bps

PPR

PPS-NULL

2400bps

PPR

PPS-NULL

2400bps

Calling Side (transmitter)

Called Side (receiver)

Block transmission

Frame 0

Frame 1

Frame 255

Frame
Frame

Frame

Error present

1st re-transmit of block

Frame

2nd re-transmit of block

3rd re-transmit of block

Error present

"Shall cancel

re-transmitting

of this block."

Line disconnected

"I understand."