Sharp UX-108 Service Manual page 53

[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.
[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 input
RXIN
into modem
(Example: TEL speaking)
CML
TEL
HS DETECTOR
LINE
EXT.
HANDSET
H
SPEAKER
L
L H
Function
Function
TEL/LIU PWB
TX OUT
H
L
RX IN
CI DETECTOR
RC VOL2
TEL IN
TEL OUT
VOL A
SP AMP
SP OUT
NO Signal Name (CNLIU)
1
2
3
4
5
6
CONTROL PWB
CML
TX CONT
1
0
0
1
RC VOL1
VOL B
0
1
Fig. 6
5 – 10
NO Signal Name (CNLIU)
TELOUT 7
TELIN 8
TELMUTE 9
CI 10
HS 11
RHS 12
GAIN-C
SIGTX
SIGRX
BZOUT
XFC3
BZ CONT
SP MUTE
TEL MUTE
CI
HS
UX-108U/178U/188U
FO-375U
RXIN
TXOUT
CML
+24VA
+5V
DG
MODEM
(R96DFXL-CID)
RC VOL2
RC VOL1
GAIN-C
TXCONT
CML