Telephone Line Interface - Panasonic KX-TG6841B Service Manual

4.4.5.

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 → C111 → Q111 → BBIC pin 59
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.
+3.0V
R172
C178
RX
C175
Pin 16 of IC501
Q171
TX Pin 28 of IC501
Hook
Pin 6 of IC501
BELL
Pin 59 of IC501
R160
Q161
C
B
E
C163
C173
R177
R164
R161
C184
KX-TG6841B/KX-TG6842B/KX-TG6843B/KX-TG6844B/KX-TG6845B/KX-TG6873B/KX-TGA680B
Q141
C
E
B
R141
C101
D101
Q142
1
C
B
4
E
C102
+3.0V
Q111
15
2
L1T
3
L1R
P101
TEL JACK