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29

4. Concerning Transmission Time

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

Transmission time consists of the following.
Control time:

This is time at the start of transmission when the functions at the sending and receiving sides are confirmed, the 

trans-

mission 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.

5. Facsimile Standards

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

 

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) or TCM (V.17)

Transmission Speed

300 bps (Control Signal)
 
2400, 4800, 7200, 9600, 12000, 14400 bps (FAX Signal)

Redundancy Compression
 
Process
 
(Coding Mode)

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

)

Resolution

Main Scan: 8 pel/mm
 
Sub Scan: 3.85, 7.7l/mm, 15.4l/mm

Line Synchronization Signal

EOL Signal

1 Line Transmission Time
 
[ms/line]

Depends on the degree of data reduction.
 
Minimum Value: 10, 20, 0
 
Can be recognized in 40ms.

30

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

31

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

Bit No.

DIS/DTC

DCS

32

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.

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.

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”: neuritic 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 14400 bps) designated by DCS, and the receiving side optimizes
the automatic equalizer, etc., according to this signal.

Bit No.

DIS/DTC

DCS