| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem wherein a fault is incurred in ISDN (integrated service digital network) communication since a low-pass filter that is used for digital subscriber line (DSL) communication to cut a high frequency signal on the DSL and to pass a low frequency signal, is composed of an inductor and a capacitor but has a characteristic in which an impedance from a PSTN (public switched telephone network) port side is rapidly increased near a cutoff frequency. SOLUTION: A resistor RS1 is provided in series with an inter-line capacitor C3 at a PSTN port side of the low-pass filter for DSL. COPYRIGHT: (C)2005,JPO&NCIPI
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