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[Signals for status recognition according to input signals]
Signal Name
H: The handset is in the on-hook state.
RHS
L: The handset is in the off-hook state.
CI
Incoming call (CI) detection signal
H: The handset or external telephone is in
the on-hook state.
HS
L: The handset or external telephone is in the
off-hook state.
H: No recording paper.
P.E
L: Recording paper exists.
[Other signals]
Signal Name
TEL IN
Receiving signal from line or modem
TEL OUT
Transfer signal to line
SPOUT
Speaker output signal
Transmission (DTMF) analog signal output
TXOUT
from modem
Reception (DTMF, others) analog signal
RXIN
input into modem
NO
Signal Name (CNLIUA)
1
PC-RLY
2
+24V
3
DG
4
+5V
5
CML
6
CI
7
HS
8
RHS
(Example: Fax signal send)
LINE
EXT.
Handset
HOOK SW
TX/RX SIGNAL
OGM/MEMO RECORD SIGNAL
OGM/ICM/MEMO PLAYBACK SIGNAL
Function
Function
NO
Signal Name (CNLIUB)
1
TELIN
2
TELOUT
3
TXOUT
4
RXIN
5
TEL MUTE
6
P. E
7
VREF
8
SP MUTE
9
SPOUT
LIU PWB
CML
H
L
CI
DETECTOR
RXIN
TELIN
TELOUT
Speaker
SPOUT
SPMUTE
P. E
10. Sensor circuit
For the recording paper sensor (P.E), when there is recording
paper, the photo transistor in the light receiving side is ON and the
detection level is LOW. When there is no recording paper, the
photo transistor in the light receiving side is OFF and the detection
level is HIGH.
11. Cl detection circuit
The CI detection circuit detects the CI signals of 15.3 Hz to 68 Hz.
A CI signal, which is provided to the photo-coupler PC3 through
the C1 (0.82 uF), R2 (22 K), and ZD3 when the ring signal is
inputted from the telephone line, is filtered by the R8 and C12,
and then transmitted to the control PWB through the Q3.
12. Power supply and bias circuits
The voltages of +24V and +5V are supplied from the control PWB
unit.
CONTROL PWB
CML
SEL A
SEL A
GAIN-C
SEL C
TXCONT
1
1
TXOUT
0
0
1
0
MPX B
VOL A
VOL B
VOL C
MPX C
1
X0
0
X1
X2
X7
+5V
+24VA
DG
VREF
Fig. 7
5 – 11
SIG TX
MODEM
(R144V24)
SIG RX
0
1
RXCONT
MONITOR
1
TXCONT
MPX B
XFC-MVP
MPX C
SP MUTE
TEL MUTE
CI
RHS
FO-1850TH
SEL C
GAIN-C
SEL A
CML
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