Canon FAX L1000 Service Manual page 525

c) D-Channel Standard Protocol
Calling party
Layer 2
connection
Protocol
Layer 3
connection
Protocol
Layer 3
disconnection
Protocol
Layer 2
disconnection
Protocol
Layer 3 Layer 2
*: Messages in brackets are options.
ISDN
SABME
UA
SETUP
(SETUP ACK) *
(CALL PROC) *
(ALERT) *
CONN
CONN ACK
Bch Protocol
DISC
REL
REL COMP
DISC
UA
Layer 2 Layer 3
Figure 5-76 D-Channel Protocol Flow
5-167
FAX-L1000 Chapter 5: Appendix
Called party
SETUP
SABME
UA
(ALERT) *
CONN
CONN ACK
DISC
REL
REL COMP
DISC
UA
Layer 2 Layer 2 Layer 3
Layer 2
connection
Protocol
Layer 3
connection
Protocol
Layer 3
disconnection
Protocol
Layer 2
disconnection
Protocol