Major Signals Used For Channel B Layer 6 - Canon G3 Error Code List

CDPB (Command Document Page Boundary)
It is a signal used to indicate that the state is between pages. It indicates a check point
reference number for recovery of a transmission error.
RDPBP (Response Document Page Boundary Positive)
It is a signal transmitted when the page specified by CDPB has been received normally.
The response indicates the check point reference number and the limits of reception abil-
ity (whether the memory is approaching its limit).
RDPBN (Response Document Page Boundary Negative)
It is a signal transmitted when the page specified by CDPB has not been received nor-
mally. The response is a reason parameter, and indicates the reason why RDPBN has been
sent (continuation of the session is not possible, sequence of transmission is wrong, error
exists in the local terminal, irreparable error exists in the procedure, etc.).
CDCL (Command Document Capability List)
It is a signal used to indicate the functions on the part of the transmitter, and it negotiates
the transmission document size, resolution, and the like.
RDCLP (Response Document Capability List Positive)
It is a signal used to indicate the functions on the part of the receiver, and it negotiates the
reception document size, resolution, and the like.
CDR (Command Document Resynchronize)
It is a signal transmitted to indicate suspension of the document procedure on the part of
the transmitter and to instruct re-synchronization.
RDRP (Response Document Resynchronized Positive)
It is a signal used to acknowledge response to CDR.
CDD (Command Document Discard)
It is a signal used to suspend the document procedure on the part of the transmitter and to
indicate an abnormal end of a document, while instructing destruction of the document.
RDDP (Response Document Discard Positive)
It is a signal used to acknowledge response to CDD.
RDGR (Response Document General Reject)
It is a signal used in response to an error in the document procedure on the part of the
receiver, requiring re-synchronization.
CDUI (Command Document User Information)
It is a signal used to indicate that its information field contains user information. In other
words, it is used to indicate that the data (MMR data, etc.) is of layer 6 or higher.

4.9 Major Signals Used for Channel B Layer 6

P-START, PIX, and P-END explained below are used internally at Canon, and they are not part
of the ITU-T recommendations.
P-START (Page-Start)
It is added to the beginning of image data (page), and the page attributes (transmission
document size, resolution, etc.) are transmitted as parameters.
PIX (Pixel)
It may be the header of image data or image data itself (MMR data, etc.).
P-END (Page-End)
It is added to the end of image data (page) as opposed to P-START.
A-31
Appendix