Ringing interface card for telephone test equipment
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United States of America Patent
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-
Mar 3, 1987
Grant Date -
N/A
app pub date -
Mar 25, 1985
filing date -
Mar 25, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is directed toward a new type of ringing interface card which overcomes the inability of known cards for testing multi-party service and which enable a technician to measure the ringing frequency and simultaneously to detect which of the tip and ring conductors receives the ringing signal.
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