Key telephone system
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United States of America Patent
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-
Jun 19, 1990
Issued Date -
N/A
app pub date -
Jun 6, 1989
filing date -
Mar 18, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A key telephone system has an oscillation preventing circuit comprising a termination impedance element, said circuit is a switching element and connected between the ground and another circuit which includes an impedance compensating circuit, therein. The switching element is turned ON upon oscillation of the impedance compensating circuit due to any remarkable impedance fluctuation in the signal transmission line, thereby effectively suppressing such oscillation of the impedance compensating circuit to maintain a favorable transmission efficiency.
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Family
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