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
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
b
1
F
0
A
1
C
1
When this frame is the final fame, X=1.
DP120F/DP125F Dialing and Communication Procedure
F
A
C
Format
b
b
b
b
2
3
4
1
1
1
1
1
1
1
1
1
0
0
X
FCF
FIF
b
b
b
5
6
7
8
1
1
0
1
1
1
0
0
0
9-10
FCS
F
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