发明名称 Method and apparatus for testing cables
摘要 Apparatus and method for testing lines. The apparatus is particularly useful for testing lines in a switched network, such as might be used to electronically route telephone and computer data lines to various offices in an office building. The apparatus includes an AC test source and a DC measurement device located at a near end switch. A DC transform circuit is located at a far end switch. According to the test method, an AC test signal is injected onto a line under test at the near end. At the far end, the received signal is converted to DC, which is sent to the near end. Line attenuation, and hence fault conditions, are detected by comparing the DC signal to the transmitted AC signal. Techniques to increase the signal to noise ratio of the DC signal are also disclosed.
申请公布号 US5644617(A) 申请公布日期 1997.07.01
申请号 US19950371734 申请日期 1995.01.12
申请人 TERADYNE, INC. 发明人 SCHMIDT, KURT E.
分类号 H04B17/00;H04M3/28;H04M3/30;(IPC1-7):H04M1/24;G01R27/02 主分类号 H04B17/00
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