Appendix
A-26
4.1 Channel D Control Procedure
A channel D procedure is basically a procedure between an exchange (ISDN network) and a
terminal (facsimile machine), not requiring synchronization between signals between the termi-
nal of the machine and that of the other party. Study the following for a channel D control
procedure in circuit switching mode:
4. CONTROL PROCEDURE AND SIGNALS USED FOR G4
Figure 6 Channel D Control Procedure
Calling side
SABME
UA
SABME
UA
SETUP
SETUP
CALL PROC
ALERT
CONN
DISC
DISC
UA
REL
REL COMP
DISC
DISC
UA
REL
REL COMP
CONN ACK
ALERT
CONN
CONN ACK
Cannel B procedure
Layer 3 Layer 2
Layer 2
connection
procedure
Layer 2
connection
procedure
On the part of the called side,
SETUP is received before the
layer 2 connection procedure
Layer 3
connection
procedure
Calling (option)
Layer 3
connection
procedure
Layer 3
disconnection
procedure
Layer 2
disconnection
procedure
Layer 3
Layer 2
Layer 2 Layer 3
Layer 2
ISDN
Called side
Layer 3
disconnection
procedure
Layer 2
disconnection
procedure
Содержание PowerShot G3
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