发明名称 |
CURRENT SUPPLY SYSTEM FOR SUBSCRIBER LINE CIRCUITS |
摘要 |
<p>A current supply system for terminal devices in which line circuits are divided into groups in accordance with a line impedance between an exchange or switching network and respective terminal devices or telephone sets, and a voltage is applied to respective groups of line circuits which corresponds to a current matching the line impedance for respective groups of line circuits.</p> |
申请公布号 |
CA1042122(A) |
申请公布日期 |
1978.11.07 |
申请号 |
CA19760246538 |
申请日期 |
1976.02.25 |
申请人 |
HITACHI, LTD. |
发明人 |
SHIRASU, HIROTOSHI;YAMASHITA, HIDETAKA;OONUMA, TATSUMASA;FUKUHARA, TAKESHI |
分类号 |
H04M19/00;(IPC1-7):04M19/00;04M1/76 |
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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