Major Signals Used For Channel B Layer 5 - Canon G3 Error Code List

Appendix

4.8 Major Signals Used for Channel B Layer 5

CSS (Command Session Start)
It is a signal used when layer 5 is connected. It carries calling terminal identifier, terminal
ID (telephone number), and date information, and negotiates layer 5 window size.
RSSP (Response Session Start Positive)
It is a signal transmitted when CSS has been received and layer 5 may be connected.
Except that the calling terminal identifier of CSS is the called terminal identifier, its par-
ticulars are the same as those of CSS.
RSSN (Response Session Start Negative)
It is a signal transmitted when CSS has been received and layer 5 cannot be connected.
CSE (Command Session End)
It is a signal transmitted when ending layer 5.
RSEP (Response Session End Positive)
It is a signal used to acknowledge response to CSE, and is transmitted when the called
terminal can end the current layer 5 normally.
CSCC (Command Session Change Control)
It is a signal transmitted when the right of transmission is reversed in layer 5, and is used
in polling mode.
RSCCP (Response Session Change Control Positive)
It is a signal used to acknowledge response to CSCC, indicating that a switch-over of the
right of transmission may be made.
CSUI (Command Session User Information)
It is a signal used to indicate that its information field contains a document procedure-
related command, parameter, and information.
RSUI (Response Session User Information)
It is a signal used to indicate that its response field contains a document procedure-related
response and parameters.
CSA (Command Session Abort)
It is a signal transmitted when suspending a session procedure. When a condition in which
a session cannot be continued is detected, the signal may be transmitted at any time by
either terminal. It is, however, transmitted only when there is no other means to end the
session.
RSAP (Response Session Abort Positive)
It is a signal used to acknowledge response to CSA, and is transmitted when an end to a
session is accepted.
CDS (Command Document Start)
It is a signal transmitted when starting a document procedure. It starts a document or the
first page.
CDE (Command Document End)
it is a signal transmitted when ending a document procedure. It indicates the last check
point reference number.
RDEP (Response Document End Positive)
It is a signal use to acknowledge response to CDE, and it confirms the last check point and
indicates the reference number of the last page.
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