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33

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

34

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

35

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

36

The modem (IC5) has all the hardware satisfying the CCITT standards mentioned previously. 
When the ASIC IC1 (61) is brought to a low level, the modem (IC5) is chip-selected and the resistors inside IC are selected by the
select signals from ASIC (IC1) ADR0-ADR4. The commands are written through the data bus, and all the processing is controlled
by the ASIC (IC1) according to CCITT procedures. The INT signal dispatched from IRQ (pins 100 of IC5) to ASIC (IC1) when the
transmission data is accepted and the received data is demodulated, the ASIC (IC1) implements post processing. This modem
(IC5) has an automatic application equalizer. 
With training signal 1 or 2 during G3 reception, it can automatically establish the optimum equalizer. The modem (IC5) operates
using the 32.256 MHz clock (X3).

1. Facsimile Transmission

The digital image data on the data bus is modulated in the modem (IC5), and sent from pin 69 via Analog SW IC10, amplifier
IC9 and the NCU section to the telephone line.

Refer to Block Diagram(P.21).

2. Facsimile Reception 

The analog image data which is received from the telephone line passes through the NCU section and enters pin 47 of the
modem (IC5). The signals that enter pin 47 of the modem (IC5) are demodulated in the board to digital image signals, then
placed on the data bus.
In this case, the image signals from the telephone line are transmitted serially. Hence, they are placed on the bus in 8 bit
units. Here, the internal equalizer circuit reduces the image signals to a long-distance receiving level. 
This is designed to correct the characteristics of the frequency band centered about 3 kHz and maintain a constant receiving
sensitivity. It can be set in the service mode. 

Refer to Sgnal Route(P.108).

3. DTMF Transmission (Monitor tone) 

The DTMF signal generated in the modem (IC5) is output from pin 56, and is then sent to the circuit on the same route as
used for facsimile transmission.

Refer to Sgnal Route(P.108).

(DTMF Monitor Tone) 
Refer to Sgnal Route(P.108).

4. Call Tone Transmission

This is the call signal which is generated in the ASIC (IC1) and sent to the speaker.

Refer to Sgnal Route(P.108).

5. Busy/Dial Tone Detection 

The path is the same as FAX receiving. When it is detected, the carrier detect bit of the resistor in the modem (IC5) becomes
1, and this status is monitored by the ASIC (IC1).

6. Caller ID Detection 

The caller ID signal which is received from the telephone line/passes through IC1 pin (2-1). And it enters pin 50 of the modem
(IC5).