Canon FAX L1000 Service Manual page 527

High Layer Compatibility
With an outgoing G4 call, "G4 FAX" is set, with an outgoing G3 call, "G2/G3 FAX", and
with telephone, "TEL". (There is no telephone in this machine.) Addition of this required
information is handled as an option in ITU-T recommendations. Additionally, this machine
can use a service switch to set the required information to "Add/Do not Add" in the
SETUP message when making an outgoing G4/G3 call.
e) B-Channel Standard Protocol (G4)
Transmitter
Layer 6 Layer 4 Layer 2
Layer 5 Layer 3
*1: The message seen by the receiving side is in brackets.
*2: The messages are terms only used within Canon.
Please note that recommendations for these message names are not being considered.
Figure 5-77 B-Channel Protocol Flow (G4)
Receiver
SABM
UA
SQ (SI) *1
SF (SF) *1
CR (CN) *1
CC (CA) *1
TCR
TCA
CSS
RSSP
CDCL
RDCLP
CDS
P-START *2
PIX *2
P-END *2
CDE
RDEP
CSE
RSEP
CQ (CI) *1
CF (CF) *1
DISC
UA
Layer 2 Layer 4
Layer 3
5-169
FAX-L1000 Chapter 5: Appendix
Connection
protocol
Negotiation
Start document
Image data
Document termination
protocol
Disconnection
protocol
Layer 6
Layer 5