Key telephone system

Details Key telephone system Key telephone system

1989-06-06

1990-06-19

Dwyer, James L.

Telephonic communications

Multi-line or key substation system with selective switching...

379166, 379399, 379398, H04M 176

Patent

active

049359576

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.

REFERENCES:
patent: 4320257 (1982-03-01), Warman
patent: 4359609 (1982-11-01), Apfel
patent: 4538032 (1985-08-01), Ballatore et al.

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