Integrated ringer relay circuit and method

Telephonic communications – Centralized switching system – With generating of call associated substation signal

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Details

379382, 379405, 379399, H04M 302, H04M 1902

Patent

active

055175651

ABSTRACT:
A circuit and method for isolating a subscriber line interface circuit ("SLIC") from the ringer generator in a telephone system. The circuit uses a gain blocking device to provide a signal gain when the ringer generator is not being utilized and to provide a high impedance when a ringer signal is present. The high impedance may be provided through an amplifier circuit which is tri-stated when the amplifier is not energized.

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patent: 4961219 (1990-10-01), Patel
patent: 5323460 (1994-06-01), Warner et al.

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