发明名称 |
SUBSCRIBER LINE INTERFACE CIRCUIT UTILIZING IMPEDANCE SYNTHESIZER AND SHARED VOLTAGE SOURCE FOR LOOP CURRENT REGULATION CONTROL |
摘要 |
A subscriber line interface circuit is described wherein current supplied to a telephone subscriber line from a shared voltage source such as a DC/DC converter is regulated thereby permitting a regulated line current to be supplied to a plurality of line circuits from a single shared voltage source. In accordance with the present invention, both the dc line feed and the ac transmission requirements of a subscriber line interface circuit for a telephone exchange are implemented in a single circuit incorporating ac and dc impedance synthesis techniques. A significant reduction in the heretofore required expensive and bulky discrete components of the subscriber line interface circuit is achieved. |
申请公布号 |
DE3173454(D1) |
申请公布日期 |
1986.02.20 |
申请号 |
DE19813173454 |
申请日期 |
1981.09.19 |
申请人 |
INT STANDARD ELECTRIC CORP |
发明人 |
CHEA, RAMON CON WOO, JR. |
分类号 |
H04M19/00;(IPC1-7):H04M19/08;H04Q3/00 |
主分类号 |
H04M19/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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