Method for detecting digital carrier signals on twisted pair transmission lines
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United States of America Patent
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Aug 26, 1997
Issued Date -
N/A
app pub date -
May 8, 1996
filing date -
Mar 4, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method and apparatus for detecting signals on a twisted pair of transmission lines includes a sensor for nonintrusively coupling a portion of the signal to the apparatus. A filter is coupled to the sensor and filters unwanted frequencies from the signal. The signal is then amplified and optionally passed to an identification circuit which identifies the presence of high and low frequency signals. The signal is rectified creating a DC signal proportional to the detected signal's strength. An audio tone proportional to signal strength is generated and the tone is amplified and output.
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