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FAX-L260i Chapter 2: Technical Reference
6.1.2 B-channel messages
a) Layer 2
Remark
The first thing sent when layer 2 is set.
A reply message for SABM, DISC.
Sent when layer 2 is released.
Message
SABM
UA
DISC
Description
Set Asynchronous Balanced
Mode
Unnumbered Acknowledge
Disconnect
Remark
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.
Message
CR
CN
CC
CA
SQ
SI
SF
CQ
CI
CF
Description
Call Request
Incoming Call
Call Connected
Call Accepted
Restart Request
Restart Indication
Restart Confirmation
Clear Request
Clear Indication
Clear Confirmation
b) Layer 3
c) Layer 4
Message
TCR
TCA
TCC
TBR
Description
Transport Connection
Request
Transport Connection
Accepted
Transport Connection Clear
Transport Block Reject
Remark
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.
Message
CSS
RSSP
RSSN
CSE
RSEP
CSCC
Description
Command Session Start
Response Session Start
Positive
Response Session Start
Negative
Command Session End
Response Session End
Positive
Command Session Change
Control
Remark
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.
d) Layer 5
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