14
KX-TG6572C/KX-TG6572R/KX-TGA653C/KX-TGA653R
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
→
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-TG6572C
Страница 2: ...2 KX TG6572C KX TG6572R KX TGA653C KX TGA653R ...
Страница 23: ...23 KX TG6572C KX TG6572R KX TGA653C KX TGA653R 4 9 Signal Route ...
Страница 24: ...24 KX TG6572C KX TG6572R KX TGA653C KX TGA653R RF part signal route ...
Страница 26: ...26 KX TG6572C KX TG6572R KX TGA653C KX TGA653R 8 Test Mode 8 1 Engineering Mode 8 1 1 Base Unit ...
Страница 28: ...28 KX TG6572C KX TG6572R KX TGA653C KX TGA653R 8 1 2 Handset ...
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Страница 47: ...47 KX TG6572C KX TG6572R KX TGA653C KX TGA653R 11 1 2 Handset ...
Страница 48: ...48 KX TG6572C KX TG6572R KX TGA653C KX TGA653R 11 1 3 Charger Unit ...
Страница 69: ...69 KX TG6572C KX TG6572R KX TGA653C KX TGA653R Memo ...
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Страница 83: ...83 KX TG6572C KX TG6572R KX TGA653C KX TGA653R 16 4 Accessories and Packing Materials P2 A3 A2 P2 A4 P1 A1 A1 ...
Страница 88: ...88 KX TG6572C KX TG6572R KX TGA653C KX TGA653R T I KXTG6572C KXTG6572R KXTGA653C KXTGA653R ...