发明名称 |
TELEPHONE LINE LONGITUDINAL BALANCE TESTER AND METHOD |
摘要 |
A longitudinal balance test circuit connects to the tip and ring lines of a pair of telephone wires. It also connects to a shield conductor that extends with the tip and ring lines. The test circuit includes a transformer which has two windings. One winding connects to the tip and ring lines, and it also connects to the shield conductor. The other winding connects to a signal generator that provides an alternating current test voltage with which to test longitudinal balance of the tip and ring lines. A method of testing a telephone line for longitudinal balance comprises: measuring an alternating current test signal applied to a telephone line under test; measuring stressed noise of the telephone line in response to the applied alternating current test signal; calculating, in response to the measured alternating current test signal and the measured stressed noise, an adjusted value related to longitudinal balance regardless of the length of the telephone line under test; and displaying the adjusted value.
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申请公布号 |
CA2313661(C) |
申请公布日期 |
2003.01.21 |
申请号 |
CA20002313661 |
申请日期 |
2000.07.10 |
申请人 |
COMMUNICATIONS MANUFACTURING COMPANY |
发明人 |
HILLIGOSS, LAWRENCE O.;ALTER, GEORGE;ABDO, JAMES A. |
分类号 |
H04M3/30;(IPC1-7):H04M3/26 |
主分类号 |
H04M3/30 |
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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