发明名称 |
Telephone subscriber loop test system |
摘要 |
A method of locating faults in a telephone system including the steps of connecting antiparallel rectifying switches (ARS's ) that inhibit alternating current (A.C.) flow in one direction but not the other between subscriber equipment and respective telephone company lines, applying an A.C. test signal to a telephone company line and measuring a resulting signal, and determining whether a fault is on the telephone company line or customer equipment based upon the resulting signal. Also disclosed is an ARS that includes a first input and output, a second input and output, and paths between respective inputs and outputs providing low turn-on thresholds in one direction between respective inputs and outputs and high turn-on thresholds in the other direction, the directions of low and high being the same for both sets of inputs and outputs.
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申请公布号 |
US4852145(A) |
申请公布日期 |
1989.07.25 |
申请号 |
US19880223435 |
申请日期 |
1988.07.22 |
申请人 |
TERADYNE, INC. |
发明人 |
BEVERS, MOREY S.;AMARO, MICHAEL G.;MUSSON, ROBERT A. |
分类号 |
H03K17/725;H04M1/24;H04M3/30 |
主分类号 |
H03K17/725 |
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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