Canon FAX-L260i Service Manual page 87

6.1.2 B-channel messages
a) Layer 2
Message
SABM Set Asynchronous Balanced
Mode
UA Unnumbered Acknowledge
DISC
Disconnect
b) Layer 3
Message
CR
Call Request
CN Incoming Call
CC
Call Connected
CA
Call Accepted
SQ
Restart Request
SI Restart Indication
SF
Restart Confirmation
CQ Clear Request
CI Clear Indication
CF
Clear Confirmation
c) Layer 4
Message
TCR Transport Connection
Request
TCA
Transport Connection
Accepted
TCC Transport Connection Clear
TBR
Transport Block Reject
d) Layer 5
Message
CSS
Command Session Start
RSSP Response Session Start
Positive
RSSN
Response Session Start
Negative
CSE
Command Session End
RSEP Response Session End
Positive
CSCC
Command Session Change
Control
FAX-L260i Chapter 2: Technical Reference
Description
The first thing sent when layer 2 is set.
A reply message for SABM, DISC.
Sent when layer 2 is released.
Description
Sent when layer 3 connects.
Received when layer 3 is connected.
Reply for CR.
Reply for CN.
Sent before layer 3 connects.
Received before layer 3 is connected.
Reply for SQ/SI.
Sent when layer 3 disconnects.
Received when layer 3 is disconnected.
Reply for CQ/CI.
Description
Sent when layer 4 connects.
Sent when TCR is received and layer 4 can be
connected.
Sent when TCR is received and layer 4 cannot be
connected.
Sent when an error is found in layer 4 information.
Description
The first thing sent when layer 5 is started. Canon
mode communication parameters are mainly added to
this command.
Sent when CSS is received and layer 5 can be started.
Canon mode communication parameters are mainly
added to this command.
Sent when CSS is received and layer 5 cannot be
started.
Sent when layer 5 is completed.
Reply for CSE.
Sent when it becomes layer 5's turn to transmit. This
is used by polling communications, etc.
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