| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that, when inserting into a communication line a filter circuit for reducing noise superimposed on a modem signal, it is necessary to remove the communication line from a modem and then insert the filter, thereby causing long-time communication interruption. <P>SOLUTION: Between an interface section of a modem and a communication line connected to the modem, a connection jack 15 is connected for connecting a plug with filter circuit. The plug with filter circuit 14 which includes a filter circuit for suppressing noise in the same band as a frequency band to be used by other modem, is connected so as to be inserted and removed to the connection jack. <P>COPYRIGHT: (C)2010,JPO&INPIT |
