Telephone system and method operated from central office loop current
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 22, 1989
Grant Date -
N/A
app pub date -
Dec 22, 1986
filing date -
Dec 22, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A telephone having a hook switch is coupled to tip and ring conductors for receiving loop current from a central office responsive to an off-hook condition at the hook switch. The electronic circuitry within the telephone for facilitating various functions is powered entirely from the loop current flowing from the central office during the off-hook condition; with loop current being maintained after termination of the off-hook condition in order to perform certain call functions.
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Family
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Cited Art Landscape
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