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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

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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

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b. Redundancy Compression Process Coding Mode

This unit uses one-dimensional MH format.

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.

Signal

Identification Signal Format

Function

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This section is the interface between the telephone line and external telephone. It is composed of an EXT. TEL line relay (RLY200),
bell detection circuit, TAM interface circuit, line amplifier and side tone circuits and a multiplexer.

1. Circuit Operation

Normally, this relay switches to the external telephone side (break) and switches to the open side (make) while OFF-HOOK.
{ IC4 (83) High Level

→CN921 (5) High Level} →CN500 (5) High Level→Q210 ON→RLY200 (ON)→(make)

{ IC4 (12) High Level

→CN921 (10) High Level} →CN500 (10) High Level→PC203 ON→Q206 (ON)→(make)

1. Circuit Operation

The signal waveform for each point is indicated below. The signal (low level section) input to pin 6 of gate array  IC107 on the
digital board is read by ASIC and judged as a bell.

TEL LINE

→PC205 (1, 2 - 4)→IC4 (10)

1. Function

This unit is compatible with the Caller ID service offered by your local telephone company. To use this feature, you must sub-
scribe to a Caller ID service. The data for the caller ID from the telephone exchange is sent during the interval between the
first and second rings of the bell signal. The data from the telephone exchange is a modem signal which is modulated in an
FSK (Frequency Shift Keying) format. Data “0” is a 1200 Hz sine wave, and data 1 a 2200 Hz sine wave.
There are two type of the message format which can be received: i.e.the single data message format and multiple data mes-
sage format.
The multiple data format allows to transmit the name and data code information in addition to the time and telephone number
data. 
When there is multiple data in the unit, the name or telephone number are displayed.

2. Circuit Operation

FSK signal of the caller ID signal input from TEL LINE is processed with BBIC (IC4).
Refer to Check Sheet (P.120) for the route of caller ID signal.

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1. Circuit Operation

The reception signal output from the line transformer T201 is input to pin (2) of IC204 via C244, R237 and then the signal is
amplified at pin (1) of IC204 and sent to the reception system.

The transmission signal goes through L225 and enters IC204-pin (6), where the signal is amplified. Then, it is output from pin
(7) of IC204 and transmitted to T201 via C248, R245, R244. Without a side tone circuit, the transmission signal will return to
the reception amplifier via R237, C244. When the side tone circuit is active, the signal output from IC204 pin (7) passes
through R241, R233, C234, R229 and L220 and goes into the amplifier IC204 pin (3). This circuit is used to cancel the trans-
mission return signal.

The TX signal is output to the circuit analog the route from the IC204 7 pin

→C248→R245→R244→T201→TEL LINE.

However, if balance is lost in the bridge, a voltage occurs between the IC209 6 pin and 5 pin and a side tone results, because
the balance cannot be maintained completely at all frequencies in the audio range some side tone always occur.

1. Function

Another telephone connected to same line activates the unit to the FAX mode by using a DTMF signal.

2. Signal Path

Refer to Check Sheet (P.120).