发明申请
US20050007214A1 ADSL filter 有权
ADSL过滤器

ADSL filter
摘要:
An ADSL/POTS filter includes a switchable impedance 220 which is inserted on the low frequency side of filter 2, 3, 5, 6, 7. The impedance is switched by switch 209 which is controlled by a line sensor so that the impedance is switched into the circuit when the telephone 44 goes off-hook.
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