Self-adjusting telephone line status detection indication
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United States of America Patent
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Apr 21, 1998
Grant Date -
N/A
app pub date -
Oct 22, 1992
filing date -
Oct 22, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a multi-line telephone system, an improved method is provided for automatically detecting and indicating the status of each of a plurality of telephone lines despite variations in battery voltages on the line or lines and without requiring any adjustments by the user. Each of the lines in a system can be polled sequentially or individually as desired. The improved method measures the present voltage level associated with the selected line, distinguishes the condition of on-or-off hook or on-hold from other possible states, compares and processes the present measured voltage level in a state matrix, and updates the status indication of the selected telephone line accordingly. Status conditions which are detected and indicated by this method include on-hook, off-hook, and on-hold.
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