发明名称 |
DETECTION OF GROUND OR LOOP START CONFIGURATION IN TELEPHONE LOOP SIGNALLING CIRCUIT |
摘要 |
<p>DETECTION OF GROUND OR LOOP START CONFIGURATION IN TELEPHONE LOOP SIGNALLING CIRCUIT A telephone loop signalling circuit, which automatically replicates either a loop start or a ground start configuration under virtually all operating conditions of the telephone line including those which have heavily induced power line voltages. The circuit utilizes a bias network connected to the central office side of the line together with a plurality of detectors which coact with logic circuitry to differentiate between the two configurations under these widely varying conditions</p> |
申请公布号 |
CA1201228(A) |
申请公布日期 |
1986.02.25 |
申请号 |
CA19840451894 |
申请日期 |
1984.04.12 |
申请人 |
NORTHERN TELECOM LIMITED |
发明人 |
KASBIA, PURAN S.;LI, YUAN-LU |
分类号 |
H04M3/22;H04M19/02;(IPC1-7):H04M3/22 |
主分类号 |
H04M3/22 |
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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