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KX-TGC310/KX-TGC312/KX-TGC320/KX-TGC322/KX-TGCA30
KX-TGC310/KX-TGC312/KX-TGC320/KX-TGC322/KX-TGCA30
KX-TGC310/KX-TGC312/KX-TGC320/KX-TGC322/KX-TGCA30
4.3.5.
Telephone Line Interface
Telephone Line Interface Circuit:
Function
Function
• Bell signal detection
• ON/OFF hook and pulse dial circuit
• Side tone circuit
• ON/OFF hook and pulse dial circuit
• Side tone circuit
Bell signal detection and OFF HOOK circuit:
In the idle mode, Q141 is open to cut the DC loop current and decrease the ring load. When ring voltage appears at the Tip (T)
and Ring (R) leads (When the telephone rings), the AC ring voltage is transferred as follows:
T
and Ring (R) leads (When the telephone rings), the AC ring voltage is transferred as follows:
T
R111 C110 Q111 BBIC pin 5 [BELL]
When the CPU (BBIC) detects a ring signal, Q141 turns on, thus providing an off-hook condition (active DC current flow through
the circuit). Following signal flow is the DC current flow.
T
the circuit). Following signal flow is the DC current flow.
T
D101 Q141 Q161 R163 D101 P101 R
ON HOOK Circuit:
Q141 is open, Q141 is connected as to cut the DC loop current and to cut the voice signal. The unit is consequently in an on-
hook condition.
hook condition.
Pulse Dial Circuit:
Pin 6 of BBIC turns Q141 ON/OFF to make the pulse dialing.
Side Tone Circuit:
Basically this circuit prevents the TX signal from feeding back to RX signal. As for this unit, TX signal feed back from Q161 is
canceled by the canceller circuit of BBIC.
canceled by the canceller circuit of BBIC.
4.3.6.
Transmitter/Receiver
• Audio Circuits and DTMF tone signal circuits.
Base Unit and Handset mainly consist of RF Module and DECT BBIC.
Base Unit and Handset transmit/receive voice signal and data signal through the antenna on carrier frequency.
Base Unit and Handset transmit/receive voice signal and data signal through the antenna on carrier frequency.
Signal Path:
*Refer to Signal Route(P.17).
HOOK
BELL
BELL
PULSE_MUTE
HOOK
BELL
C120
1000p
RA151
1k
1
2
3
4
C121
680p
C122
680p
C102 680p
C115
100n
C181
NC
R123
NC
(3216)
R158
4.7k
R141
100k
R142
2.7k
(3216)
D141
.
R118
100k
SA101
270V
2
1
R167
NC
R103
NC
C184
1u
P101
C161
10u
*Q141
B
E
C
*C143
1u
Q161
B
C
E
L1R
C103
NC
C164
0.1u
R163
39
(0.5W)
C142
K0.01u
*R149
680
L2R
D142
NC
R117
100k
GAP
1
2
0
6
1
R
0
7
2
D101
1
4
3
2
*Q140
.
L2T
R10
4
NC
R115
5.6M
D133
L1T
C152
0.01u
C104
NC
D132
4
6
1
R
k
2
.
2
R152
130k
Q142
*R148
10k
R165
27k
C101 680p
R144
NC
R162
NC
R151
100k
C167
2700p
SA102
NC
2
1
*R124
10
(3216)
R116
5.6M
C166
NC
C116
100n
C112
0.1u
C110
0.1u
R113
22k
R114
68k
+3.0V
D113
R111
1M
Q111
R112
47k
C113
0.01u
VDDC
C178
0.1u
C193
0.027u
C175
560p
+3.0V
Q171
R171
220
R172
680k
R176
1k
R175
3.9k
R177
1k
C176
1u
C171
0.033u
*C141
2.2u
R159
1.5k
*R145
3.9k
R169
47k
R121
390k
R122
390k
D143
NC
L101
27n
RX
(BLACK)
(BROWN)
(RED)
(YELLOW)
Bell detection
DC Monitor
Caller ID
TX
Pin 16 of IC501
Pin 28of IC501
Pin 24 of IC501
Pin 25 of IC501
Pin 5 of IC501
Pin 6 of IC501
Pin 17 of IC501
Pin 19 of IC501
Pin 18 of IC501
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