Toshiba DP120F Service Manual page 574

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
March 2000 © TOSHIBA TEC