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DIALING/COMMUNICATION CONTROL
3 - 9
3
3) Frame structure of binary signals
Each binary signal frame is comprised of the following sequence and fields. However, some binary
signals do not have the FIF field inserted.
Preample
F : Flag sequence
Indicates the start or end of a frame. Also establishes the frame synchronization.
A : Address field
Informs the address.
C : Control field
Informs if this frame is the last one in this procedure.
FCF: FAX control field
Informs the type of the binary signal.
FIF: FAX information field
Informs FAX information such as the functions.
FCS: Frame check sequence
Checks if there was any error in the transmission from A to FIF.
- Format of F, A and C
* When this frame is the last frame, X = 1.
FFACFCFFIFFCSF
Format
b
1
b
2
b
3
b
4
b
5
b
6
b
7
b
8
F 01111110
A 11111111
C 1100x000