发明名称 |
UN CIRCUITO DE LLAMADA A PUESTOS DE ABONADO. |
摘要 |
<p>A loop current supervisory device and a central tone generator are coupled to a line leading to a called subscriber. Each is alternately rendered operative via a central astable relaxation oscillator. Thus loop current supervision and the ringing phase are clearly separated from each other.</p> |
申请公布号 |
ES378694(A1) |
申请公布日期 |
1972.07.16 |
申请号 |
ES19940003786 |
申请日期 |
1970.04.16 |
申请人 |
STANDARD ELECTRICA, S. A. |
发明人 |
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分类号 |
H04M19/02;H04M19/04;(IPC1-7):04M/ |
主分类号 |
H04M19/02 |
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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