Subscriber protector circuit for the communication line of non-DC supply

PURPOSE: A protection circuit for a communication line is provided to protect a communication device from a surge voltage by cutting off the surge voltage when the surge voltage is introduced to the communication line. CONSTITUTION: A surge absorbing circuit(11) is connected between local lines(L1,L...

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Bibliographic Details
Main Author SONG, DONG IL
Format Patent
LanguageEnglish
Korean
Published 06.11.2000
Edition7
Subjects
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Summary:PURPOSE: A protection circuit for a communication line is provided to protect a communication device from a surge voltage by cutting off the surge voltage when the surge voltage is introduced to the communication line. CONSTITUTION: A surge absorbing circuit(11) is connected between local lines(L1,L2) of a communication line. Condensers(C1,C2) are connected between the local lines(L1,L2) and inner lines(T1,T2). By the above-mentioned structure, a DC voltage is cut off and a surge voltage is cut off by using the function of the condensers(C1,C2). The protection circuit is used in a communication line to which a DC power source is not connected. According to the protection circuit for a communication line, a communication device from a surge voltage is protected by cutting off the surge voltage when the surge voltage is introduced to the communication line. 본 발명은 낙뢰 등으로 통신선로에 써지전압이 유입되었을 때 써지전압을 차단하여 써지전압으로부터 통신기기를 보호하는 가입자 보호기 회로에 관한 것이다. 이 장치는 도 3과 같이 통신선로의 국선측 L1과 L2 사이에 써지흡수회로(11)를 연결하고 그 후단에 통신선로 국선측(L1, L2)과 내선측(T1, T2) 사이에 콘덴서(C1, C2)를 연결하여 구성한 것이다. 이것은 직류전압은 차단하고 교류전압은 통과시키는 콘덴서의 기능을 이용하여 써지전압을 차단한 것으로써 국선측(예:한국통신)에서 직류전원을 공급하지 않는 통신선로(모뎀, 반송중계장치, ISDN단말기 등)에 사용하는 가입자 보호기 회로이다.
Bibliography:Application Number: KR20000019081