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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

30

NCU is the with the telephone line. It is composed of Bell detection circuit, Pulse dial circuit, Line amplifier and sidetone circuits. The
following is a brief explanation of each circuit.

1. Circuit Operation

Normally, this relay switches to the external telephone side (break) and switches to the open side (make) while OFF-HOOK.
{ IC101 (V6) High Level

→CN300 (9) High Level} →CN405 (9) High Level→Q406 ON→RLY401 (ON)→(make)

1. Circuit Operation

The signal waveform for each point is indicated below. The signal (low level section) input to pin V4 of SOC IC101 on the dig-
ital board is illustrated.

 IC101 (V6) High Level(make)

→Q406 ON(make)→RL401 ON(make)→TEL line

 IC101 (V6) Low Level(break)

→Q406 OFF(break)→RL401 OFF(break)→TEL line

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1. Circuit Operation

The reception signal output from the line transformer T401 is input to pin (2) of IC401 via C408, R409 and then the signal is
amplified at pin (1) of IC401 and sent to the reception system.

The transmission signal is output from IC107(7) and transmitted to T401 via C413 and R414. If the side tone circuit is not
applied, the transmission signal will return to the reception amplifier via C408 and R409.When the side tone circuit is active,
the signal output from IC107 pin (7) passes through R413, C410, C409,and R410 and goes into the amplifier IC401 pin (3).
This circuit is used to cancel the transmission return signal.

32

The scanning block of this device consists of a control circuit and a contact image sensor made up of a celfoc lens array, an LED, a
light guide, and photoelectric conversion elements.

When an original document is inserted and the start button pressed, pin E1 of IC101 goes to a high level and the transistor Q215
turns on. This applies voltage to the LED to light it. The contact image sensor is driven by each of the FTG-F1 signals output from
IC101, and the original image illuminated by the LED undergoes photoelectric conversion to output an analog image signal (SIG).
The analog image signal is input to the IC101 on AIN1 (pin A3) and converted into 8-bit data by the A/D converter inside IC101.
Then this signal undergoes digital processing in order to obtain a high-quality image.