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15
KX-TG234SK/KX-TGA470B
4.4.6.
Parallel Connection Detect Circuit/Auto Disconnect Circuit
Function:
In order to disable call waiting and stutter tone functions when using telephones connected in parallel, it is necessary to have a
circuit that judges whether a telephone connected in parallel is in use or not. This circuit determines whether the telephone
connected in parallel is on hook or off hook by detecting changes in the T/R voltage.
Circuit Operation:
Parallel connection detection when on hook:
When on hook, the voltage is monitored at pin 17 of IC501. There is no parallel connection if the voltage is
0.54 V or higher, while a parallel connection is deemed to exist if the voltage is lower.
Parallel connection detection when off hook:
When off hook, the voltage is monitored at pin 18 of IC501; the presence/absence of a parallel connection is determined by
detecting the voltage changes.
If the Auto disconnect function is ON and statuses are Hold, receiving ICM, OGM transmitting, BBIC disconnects the line after
detecting parallel connection is off hook.
Q141
Q161
R141
R142
RA151
R131
R133
Q142
R151
R145
C132
Pin 17 of IC501
DCIN1
Pin 18 of IC501
DCIN2
HOOK
Pin 6 of IC501
C101
D101
C102
L101
L102
SA101
P101
TEL JACK
3
4
2
1
R163
R167
L1T
L1R
R152
C152
RA151
Содержание KX-TG234SK
Страница 49: ...49 KX TG234SK KX TGA470B Attach the LCD and fix by hook A two points A...
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