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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.
L: No recording paper.
P.E
H: Recording paper exists.
H: Door open.
DRSNS
L: Door close.
[Other signals]
Signal Name
TEL IN
Receiving signal from line or modem
TEL OUT
Transfer signal to line
Transmission (DTMF) analog signal output
TXOUT
from modem
Reception (DTMF, others) analog signal
RXIN
input into modem
(Example: Fax signal send)
CML
H
TEL
HS DETECTOR
LINE
L
EXT.
HANDSET
SPEAKER
Function
Function
TEL/LIU PWB
CONTROL PWB
HS
CML
TXOUT
CI DETECTOR
RXIN
TEL IN
TELOUT
TEL MUTE
CI
+5V
+24VA
DG
NO
Signal Name (CNLIU)
1
2
3
4
5
6
7
8. 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.
9. 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 PC1 through
the C1 (0.82 uF), R3 (22 K), and ZD3 when the ring signal is
inputted from the telephone line.
10. Power supply and bias circuits
The voltages of +5V and +24VA are supplied from the control
PWB unit.
GAIN-C
TXCONT
1
0
0
1
RCVOL
VOL A
VOL B
VOL C
BZCONT
0
1
Fig. 7
5 – 11
NO
Signal Name (CNLIU)
+24VA
8
DG
9
PE
10
+5V
11
CML
12
CI
13
HS
14
SIGTX
(R96DFXL-CID)
SIGRX
TXCONT
RCVOL
BZCONT
XFCR-MVP
SP MUTEI
TEL MUTE
CI
UX-600MU/MC
FO-1660U/C
RHS
TXOUT
RXIN
TELMUTE
DRSNS
TELOUT
TELIN
MODEM
GAIN-C
CML
HS
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