Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – With blocking of normal usage
Patent
1995-01-12
1997-07-01
Kuntz, Curtis
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
With blocking of normal usage
379 22, 379 24, 379 6, 370249, 370251, 370244, 324611, H04M 124, G01R 2702, H04B 1700
Patent
active
056446179
ABSTRACT:
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.
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Gamache Richard E.
Kuntz Curtis
Loomis Pal
Teradyne, Inc.
Walsh Edmund J.
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