发明名称 |
FAST CONTINUOUS TELEPHONE LINE FAULT DETECTION |
摘要 |
A telephone-line-connection monitoring device comprises a switch to disconnect the ringing circuit of a subscriber telephone and a ring detector circuit to monitor the central office connection for ring indications. When a ring indication is recognized, the ringing circuit switch is closed to allow ringing currents to reach the bell. The ringing circuit switch in its open condition allows a battery-voltage threshold monitor across the subscriber line connection to quickly detect a line fault. Otherwise, the large capacitor in the ringing circuit would artificially prop up the voltage and cause a slow bleed-down to the threshold voltage after a fault occurred.
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申请公布号 |
WO0035174(A1) |
申请公布日期 |
2000.06.15 |
申请号 |
WO1999US26421 |
申请日期 |
1999.11.09 |
申请人 |
INFOGEAR TECHNOLOGY CORPORATION |
发明人 |
GITNIK, NAHUM;INTRATER, AMOS |
分类号 |
H04M1/82;H04M3/12;H04M3/30;(IPC1-7):H04M3/30;H04M1/24 |
主分类号 |
H04M1/82 |
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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