Optical coupling interface circuit for telephone line ringing si

Details Optical coupling interface circuit for telephone line ringing si Optical coupling interface circuit for telephone line ringing si

1984-04-02

1985-07-16

Rubinson, Gene Z.

179 84R, H04M 126

Patent

active

045298459

ABSTRACT:
An interface circuit for use with a telephone or PABX system or as a device applied to a subscriber's telephone line, that detects ringing voltage signals and either indicates the ringing condition visually or optically couples a detection signal to other annunciator or control devices such as microprocessors. The device conforms to the requirements and limitations for application of a device to the public telephone system. This device does not respond or interfere with voice or data signals nor address signaling.

REFERENCES:
patent: 3842216 (1974-10-01), Owen et al.
patent: 4063045 (1977-12-01), Greischar
patent: 4066848 (1978-01-01), Darwood

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