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KX-TG4011N/KX-TG4012N/KX-TG4013N/KX-TGA402N
4.4.4.
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
→
L101
→
R111
→
C111
→
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
→
L101
→
D101
→
Q141
→
Q161
→
R163
→
R167
→
D101
→
L102
→
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.
Содержание KX-TG4011N
Страница 2: ...2 KX TG4011N KX TG4012N KX TG4013N KX TGA402N ...
Страница 23: ...23 KX TG4011N KX TG4012N KX TG4013N KX TGA402N 4 9 Signal Route RF part signal route ...
Страница 25: ...25 KX TG4011N KX TG4012N KX TG4013N KX TGA402N 8 Test Mode 8 1 Engineering Mode 8 1 1 Base Unit ...
Страница 27: ...27 KX TG4011N KX TG4012N KX TG4013N KX TGA402N 8 1 2 Handset ...
Страница 42: ...42 KX TG4011N KX TG4012N KX TG4013N KX TGA402N 11 1 2 Handset ...
Страница 43: ...43 KX TG4011N KX TG4012N KX TG4013N KX TGA402N 11 1 3 Charger Unit ...
Страница 72: ...72 KX TG4011N KX TG4012N KX TG4013N KX TGA402N 16 3 Cabinet and Electrical Parts Charger Unit ...
Страница 73: ...73 KX TG4011N KX TG4012N KX TG4013N KX TGA402N 16 4 Accessories and Packing Materials 16 4 1 KX TG4011N ...
Страница 74: ...74 KX TG4011N KX TG4012N KX TG4013N KX TGA402N 16 4 2 KX TG4012N ...
Страница 75: ...75 KX TG4011N KX TG4012N KX TG4013N KX TGA402N 16 4 3 KX TG4013N ...