GD-1060 DIALING AND COMMUNICATION PROCEDURE
4 - 10
January 2001 © TOSHIBA TEC
4.2.2.3 Frame structure of binary signals
Each binary signal frame is composed of the following sequences and fields. However, some binary
signals have an FIF field inserted, and others do not.
F: Flag Sequence
Indicates the start or end of a frame. It also establishes the frame synchronization.
A: Address Field
Informs of the address.
C: Control Field
Informs whether this frame is the final frame in this procedure or not.
FCF: Facsimile Control Field
Informs of the kind of binary signal.
FIF: Facsimile Information Field
Informs of the functions of the facsimile, etc.
FCF: Frame Check Sequence
Checks if there was any error in the transmission from “A” to “FIF.”
• Formats of F, A, and C
F
F
A
C
FCF
FIF
FCS
F
When this frame is the final fame, X=1.
Format
b
1
b
2
b
3
b
4
b
5
b
6
b
7
b
8
F
0
1
1
1
1
1
1
0
A
1
1
1
1
1
1
1
1
C
1
1
0
0
X
0
0
0