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33

As shown in the following diagram, the facsimile call time series is divided into five phases.

Phase A: Call setting 
Call setting can be manual/automatic. 
Phase B: Pre-message procedure 
Phase B is a pre-processing procedure and sequence for confirming the status of the terminal, transmission route, etc., and for
terminal control. It implements terminal preparation status, determines and displays terminal constants, confirms
synchronization status, etc. and prepares for transmission of facsimile messages. 
Phase C: Message transmission 
Phase C is the procedure for the transmitting facsimile messages.
Phase D: Post message procedure 
Phase D is the procedure for confirming that the message is completed and received. For continuous transmission, phase B or
phase C is repeated for transmission. 
Phase E: Call retrieval 
Phase E is the procedure for call retrieval, that is for circuit disconnection.

Transmission Time  = Control Time + Image Transmission Time + Hold Time

Transmission time consists of the following.

This is time at the start of transmission when the functions at the sending and receiving sides are confirmed, the transmission
mode is established, and transmission and reception are synchronized.

This is the time required for the transmission of document contents (image data). In general, this time is recorded in the catalog,
etc.

This is the time required after the document contents have been sent to confirm that the document was actually sent, and to
check for telephone reservations and/or the existence of continuous transmission.

Item

Telephone Network Facsimile

G3 Machine

Connection Control Mode

Telephone Network Signal Mode

Terminal Control Mode

T. 30 Binary

Facsimile Signal Format

Digital

Modulation Mode

PSK (V. 27 ter) or QAM (V. 29)

Transmission Speed

300 bps (Control Signal)
2400, 4800, 7200, 9600 bps (FAX Signal)

Redundancy Compression
Process
(Coding Mode)

1 dimension: MH Mode
2 dimension: MR Mode (K=2.4)

Resolution

Main Scan: 8 pel/mm
Sub Scan: 3.85, 7.7l/mm

Line Synchronization Signal

EOL Signal

1 Line Transmission Time
[ms/line]

Depends on the degree of data reduction.
Minimum Value: 10, 20
Can be recognized in 40ms.

34

For G3 Facsimile communication, this is the procedure for exchanging control signals between the sending and receiving
machines both before and after transmission of image signals.
Control signals at 300 bps FSK are: 1850 Hz...0, 1650Hz...1. 
An example of a binary process in G3 communication is shown below.

Explanation of Signals 
Control signals are comprised mainly of 8-bit identification signals and the data signals added to them. Data signals are added
to DIS and DCS signals.
Signal.....DIS (Digital Identification Signal) 
Identification Signal Format.....00000001
Function:
Notifies the capacity of the receiving unit. The added data signals are as follows.

Signal.....DCS (Digital Command Signal) 
Identification Signal Format.....X1000001

Example (Some models do not support the following items.):

Bit No.

DIS/DTC

DCS

1

Transmitter --- T.2 operation

2

Receiver --- T.2 operation

Receiver --- T.2 operation

3

T.2 IOC = 176

T.2 IOC = 176

4

Transmitter --- T.3 operation

5

Receiver --- T.3 operation

Receiver --- T.3 operation

6

Reserved for future T.3 operation features

7

Reserved for future T.3 operation features.

8

Reserved for future T.3 operation features.

9

Transmitter --- T.4 operation

10

Receiver --- T.4 operation

Receiver --- T.4 operation

35

11,12,13,14
0,0,0,0
0,1,0,0
1,0,0,0
1,1,0,0
0,0,1,0
0,1,1,0
1,0,1,0
1,1,1,0
0,0,0,1
0,1,0,1
1,0,0,1
1,1,0,1
0,0,1,1
0,1,1,1
1,0,1,1
1,1,1,1

Data signaling rate
V.27 ter fall back mode
V.27 ter 
V.29
V.27 ter and V.29
Not used
Reserved
Not used
V.27 ter and V.29 and V.33
Not used
Reserved
Not used
V.27 ter and V.29 and V.33 and V.17
Not used
Reserved
Not used
Reserved

Data signaling rate
2400 bit/s, V.27 ter
4800 bit/s, V.27 ter
9600 bit/s, V.29
7200 bit/s, V.29
14400 bit/s, V.33
12000 bit/s, V.33
Reserved
Reserved
14400 bit/s, V.17
12000 bit/s, V.17
9600 bit/s, V.17
7200 bit/s, V.17
Reserved
Reserved
Reserved
Reserved

15

R8

×7.7 lines/mm and/or 200×200 pels/25.4mm

R8

×7.7 lines/mm and/or 200×200 pels/25.4mm

16

Two-dimensional coding capability

Two-dimensional coding capability

17, 18
(0, 0)

(0, 1)

(1, 0)

(1, 1)

Recording width capabilities
1728 picture elements along scan line length of 
    215 mm ± 1%
1728 picture elements along scan line length of 
    215 mm ± 1%
2048 picture elements along scan line length of 
    255 mm ± 1%
2432 picture elements along scan line length of 
    303 mm ± 1%
1728 picture elements along scan line length of 
    215 mm ± 1%
2048 picture elements along scan line length of 
    255 mm ± 1%
Invalid

Recording width
1728 picture elements along scan line length of 
    215 mm ± 1%
2432 picture elements along scan line length of 
    303 mm ± 1%

2048 picture elements along scan line length of 
    255 mm ± 1%

Invalid

19, 20
(0, 0)
(0, 1)
(1, 0)
(1, 1)

Maximum recording length capability
A4 (297 mm)
Unlimited
A4 (297 mm) and B4 (364 mm)
Invalid

Maximum recording length
A4 (297 mm)
Unlimited
B4 (364 mm)
Invalid

21, 22, 23
(0, 0, 0)
(0, 0, 1)
(0, 1, 0)
(1, 0, 0)
(0, 1, 1)
(1, 1, 0)
(1, 0, 1)
(1, 1, 1)

Minimum scan line time capability of the receiver
20 ms at 3.85 l/mm: T

7.7

 = T

3.85

40 ms at 3.85 l/mm: T

7.7

 = T

3.85

10 ms at 3.85 l/mm: T

7.7

 = T

3.85

  5 ms at 3.85 l/mm: T

7.7

 = T

3.85

10 ms at 3.85 l/mm: T

7.7

 = 1/2 T

3.85

20 ms at 3.85 l/mm: T

7.7

 = 1/2 T

3.85

40 ms at 3.85 l/mm: T

7.7

 = 1/2 T

3.85

  0 ms at 3.85 l/mm: T

7.7

 = T

3.85

Minimum scan line time
20 ms
40 ms
10 ms
  5 ms

  0 ms

24

Extend field

Extend field

25

2400 bit/s handshaking

2400 bit/s handshaking

26

Uncompressed mode

Uncompressed mode

27

Error correction mode

Error correction mode

28

Reserved for G4 capability on PSTN

Frame size 0 = 256 octets     1 = 64 octets

29

T.6 coding capability

Error limiting mode

30

Reserved for G4 capability on PSTN

Reserved for G4 capability on PSTN

31

T.6 coding capability

T.6 coding enabled

32

Extend field

Extend field

33
(0)
(1)

Validity of bits 17, 18
Bits 17, 18 are valid
Bits 17, 18 are invalid

Recording width
Recording width indicated by bits 17, 18
Recording width indicated by this field bit information

34

Recording width capability 1216 picture elements along
scan line length of 151 ± mm 1%

Middle 1216 elements of 1728 picture elements

35

Recording width capability 864 picture elements along scan
line length of 107 ± mm 1%

Middle 864 elements of 1728 picture elements

36

Recording width capability 1728 picture elements along
scan line length of 151 ± mm 1%

Invalid

37

Recording width capability 1728 picture elements along
scan line length of 107 ± mm 1%

Invalid

38

Reserved for future recording width capability.

39

Reserved for future recording width capability.

Bit No.

DIS/DTC

DCS

36

Note 1 - Standard facsimile units conforming to T.2 must have the following capability: Index of cooperation (IOC)=264.
Note 2 - Standard facsimile units conforming to T.3 must have the following capability: Index of cooperation (IOC)=264.
Note 3 - Standard facsimile units conforming to T.4 must have the following capability: Paper length=297 mm.

40

Extend field

Extend field

41

R8

×15.4 lines/mm

R8

×15.4 lines/mm

42

300

×300 pels/25.4 mm

300

×300 pels/25.4 mm

43

R16

×15.4 lines/mm and/or 400×400 pels/25.4 mm

R16

×15.4 lines/mm and/or 400×400 pels/25.4 mm

44

Inch based resolution preferred

Resolution type selection
“0”: neritic based resolution
“1”: inch based resolution

45

Metric based resolution preferred

Don’t care

46

Minimum scan line time capability for higher resolutions
“0”: T

15.4

 = T

7.7

       “1”: T

15.4

 = 1/2T

7.7

Don’t care

47

Selective Polling capability

Set to “0”.

48

Extend field

Extend field

Signal

Identification Signal Format

Function

Training 1

———————

A fixed pattern is transmitted to the receiving side at a speed (2400 to 9600 bps)
designated by DCS, and the receiving side optimizes the automatic equalizer,
etc., according to this signal.

TCF
(Training Check)

———————

Sends 0 continuously for 1.5 seconds at the same speed as the training signal.

CFR 
(Confirmation to Receive)

X0100001

Notifies the sending side that TCF has been properly received. If TCF is not
properly received, FTT (Failure To Train) X0100010 is relayed to the sender.
The sender then reduces the transmission speed by one stage and initiates
training once again.

Training 2

———————

Used for reconfirming the receiving side like training 1.

Image Signal

Refer to the next page.

———————

RTC
(Return to Control)

———————

Sends 12 bits (0...01 

× 6 times) to the receiver at the same speed as the image

signal and notifies completion of transmission of the first sheet.

EOP
(End of Procedure)

X1110100

End of one communication

MCF
(Message Confirmation)

X0110001

End of 1 page reception

DCN
(Disconnect)

X1011111

Phase E starts.

MPS
(Multi-Page Signal)

X1110010

Completion of transmission of 1 page. If there are still more documents to be
sent, they are output instead of EOP. After MCF reception, the sender transmits
an image signal of the second sheet.

PRI-EOP
(Procedural Interrupt-EOP)

X1111100

If there is an operator call from the sender, it is output after RTC.

PIP
(Procedural Interrupt Positive)

X0110101

This is output when an operator call is received.

Bit No.

DIS/DTC

DCS