Integrated ringer relay circuit and method

Details Integrated ringer relay circuit and method Integrated ringer relay circuit and method

1994-06-30

1996-05-14

Hofsass, Jeffery

Telephonic communications

Centralized switching system

With generating of call associated substation signal

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.

REFERENCES:
patent: 4396805 (1983-08-01), Wagner
patent: 4472608 (1984-09-01), Beirne
patent: 4476350 (1984-10-01), Aull et al.
patent: 4595797 (1986-06-01), Gilles et al.
patent: 4776007 (1988-10-01), Styrna et al.
patent: 4827505 (1989-05-01), Takato et al.
patent: 4837818 (1989-06-01), Pieters et al.
patent: 4961219 (1990-10-01), Patel
patent: 5323460 (1994-06-01), Warner et al.

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