Toshiba GD-1270, GD-1260, GD-1250, GD-1160, GD-1210 service manual Frame structure of binary signals

(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.

F

F

A

C

FCF

FIF

FCS

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

					Format
	b1	b2	b3	b4		b5	b6	b7	b8
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

*When this frame is the last frame, X = 1.

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