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KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS
4.5.6.
Parallel Connection Detect 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 con-
nected 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 86 of IC501. There is no parallel connection if the voltage is 1.65 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 90 of IC501; the presence/absence of a parallel connection is determined when
the voltage changes by 0.2 V or more.
Содержание KX-TG3521BXB
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Страница 6: ...6 KX TG3521BXB KX TG3521BXS KX TG3522BXB KX TG3522BXS KX TGA351BXB KX TGA351BXS 3 Specifications ...
Страница 37: ...37 KX TG3521BXB KX TG3521BXS KX TG3522BXB KX TG3522BXS KX TGA351BXB KX TGA351BXS 7 4 Error Messages ...
Страница 38: ...38 KX TG3521BXB KX TG3521BXS KX TG3522BXB KX TG3522BXS KX TGA351BXB KX TGA351BXS 7 5 Troubleshooting ...
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Страница 64: ...64 KX TG3521BXB KX TG3521BXS KX TG3522BXB KX TG3522BXS KX TGA351BXB KX TGA351BXS Test Burst Mode ...
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