Toshiba GD-1221 Manuale Utente

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GD-1220/1221

DIALING/COMMUNICATION CONTROL

3 - 9

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.

F

F

A

C

FCF

FIF

FCS

F

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