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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.
F
F
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
b
1
F
0
A
1
C
1
* When this frame is the last frame, X = 1.
GD-1210/1250/1270/1160/1260
DIALING/COMMUNICATION CONTROL
A
C
FCF
b
b
2
3
1
1
1
1
1
0
FIF
FCS
F
Format
b
b
4
5
1
1
1
1
0
x
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b
b
b
6
7
1
1
1
1
0
0
8
0
1
0
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