Canon FAX L1000 Service Manual page 522

FAX-L1000 Chapter 5: Appendix
Layer 3 (Continue)
Message
REL
REL COMP
b) B-channel messages
Layer 2
Message
SABM
UA
DISC
Layer 3
Message
CR
CN
CC
CA
SQ
SI
SF
CQ
CI
CF
Layer 4
Message
TCR
TCA
TCC
TBR
Description
Release
Release Complete
Description
Set Asynchronous Balanced
Mode
Unnumbered Acknowledge
Disconnect
Description
Call Request
Incoming Call
Call Connected
Call Accepted
Restart Request
Restart Indication
Restart Confirmation
Clear Request
Clear Indication
Clear Confirmation
Description
Transport Connection
Request
Transport Connection
Accepted
Transport Connection Clear
Transport Block Reject
5-164
Remark
Sent when layer 3 is released or when
DISC is received.
Sent when REL is received. ISDN sends
with the transmitted REL.
Remark
The first thing sent when layer 2 is set.
A reply message for SABM, DISC.
Sent when layer 2 is released.
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.
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.