13
KX-TGD320ALB/KX-TGD322ALB/KX-TGD323ALB/KX-TGDA30AZB
4.3.5.
Telephone Line Interface
Telephone Line Interface Circuit:
Function
• Bell signal detection
• 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
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
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.
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.
PULSE_MUTE
BELL
HOOK
NL_CID
R121
3
90k
R122
3
90k
C120
1000p
+
3
.0V
+
3
.0V
C
33
1
NC
VDDC
L2R
L1R
L1T
L2T
*R12
3
NC
*R124
10
*Q140
R141
100k
R142
2.7k
*R144
NC
C14
3
NC
C142
0.01
u
Q161
C152
0.01
u
*C164
0.1
u
C181
NC
R117
100k
R115
5.6M
R116
5.6M
R118
100k
C115
100n
C116
100n
*Q141
Q111
D1
33
D1
3
2
D11
3
C161
10
u
*C166
NC
C178
0.1
u
Q171
*C141
NC
R114
68k
*R14
8
10k
*R149
680
*R16
2
NC
R165
27k
C11
3
0.01
u
0
7
2
0
6
1
R
*
*R15
9
1.5
k
4
6
1
R
*
k
2
.
2
k
1
7
7
1
R
R11
3
22k
R111
1M
R112
47k
*C167 2700p
R158 4.7k
RA151
1k
1
2
3
4
C101 680p
C102
680p
C121 680p
C122 680p
D101
1
4
3
2
R176
1k
C10
3
NC
*C104
NC
*R10
3
1.2k
R16
3
3
9(0.5W)
GAP
1
2
C110
0.1
u
C112
0.1
u
R171
220
R172
680k
R175
3
.9k
*R104
NC
R167
NC
C17
3
0.027
u
C175
560p
*D142
SA102
NC
2
1
*SA101
2
1
P101
C176
1
u
R151
100k
R152
1
3
0k
D14
3
NC
L101
27n
C476
NC
*C475
1
0pF
2
4
1
Q
4
8
1
C
u
1
C507
2.2
u
*D141
R1
3
1N
C
R1
33
NC
C1
3
2N
C
*R154
NC
*R15
3
NC
*Q144
NC
*C479
10pF
*R16
9
3
9k
*R145
2.2k
*C171
0.0
33u
DC Monitor
C
a
ller ID
Bell detection
Pin 28 of IC501
Pin 25 of IC501
Pin 24 of IC501
Pin 16 of IC501
Pin 18 of IC501
Pin 19 of IC501
Pin 17 of IC501
Pin 6 of IC501
Pin 5 of IC501
HOOK
BELL
Содержание KX-TGD320ALB
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Страница 73: ...73 KX TGD320ALB KX TGD322ALB KX TGD323ALB KX TGDA30AZB Memo ...
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Страница 80: ...80 KX TGD320ALB KX TGD322ALB KX TGD323ALB KZ TGDA30AZB Memo ...
Страница 87: ...87 KX TGD320ALB KX TGD322ALB KX TGD323ALB KX TGDA30AZB 15 4 Accessories A2 A1 A3 ...