Surge protected electronic switch for telephone voiceband circui

Details Surge protected electronic switch for telephone voiceband circui Surge protected electronic switch for telephone voiceband circui

1985-02-04

1987-01-06

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

361 91, 361111, 379413, H04M 131

Patent

active

046348140

ABSTRACT:
A fast response electronic switch used for control of connect and disconnect functions, primarily related to speech network applications for electronic-microprocessor based telephones utilizing dual tone multifrequency and/or universal pulse dial address signaling. Disclosed circuitry includes an active surge protector, a saturated transistor switch and bias circuit which exhibits a high AC impedance with respect to the telephone subscriber line.

REFERENCES:
patent: 4167654 (1979-09-01), Bolus et al.
patent: 4329546 (1982-05-01), Montesi et al.
patent: 4360710 (1982-11-01), Chaput et al.
patent: 4555597 (1985-11-01), Boeckmann et al.

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