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33

6. Explanation of Communication and Compression Technology
a. G3 Communication Signals (T. 30 Binary Process) 
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

34

10

Receiver --- T.4 operation

Receiver --- T.4 operation

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

Set to "0".

Frame size 0 = 256 octets     1 = 64 octets

29

Error limiting mode

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.

Bit No.

DIS/DTC

DCS

35

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.

39

Reserved for future recording width capability.

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
bps to 9600 bps) designated by DCS, and the receiving side opti-
mizes 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 docu-
ments to be sent, they are output instead of EOP. After MCF recep-
tion, 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

36

b. Redundancy Compression Process Coding Mode 
This unit uses one-dimensional MH format.