Method of detecting remote ground condition
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United States of America Patent
Stats
-
Feb 14, 2006
Grant Date -
Sep 30, 2004
app pub date -
Mar 31, 2003
filing date -
Mar 31, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Whether or not protection circuitry for a span-powered remote digital subscriber loop unit is properly connected to earth ground is determined by the deliberate assertion and detection of a ground fault from a central office line card location. The span-powered remote unit is augmented to place a controllable conduction path in circuit with the span-powered loop and an earth ground pin. If the earth ground pin has been properly connected to earth ground, applying the conductive path will place a ground fault on the span, which is detected by a ground fault detector within the central office line card. If the ground fault detector does not detect a ground fault in response to the application of the conductive path, the line card forwards a negative ground fault event message to a test center, so that a service technician may be dispatched to the remote unit to correct the problem.
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