Enhanced high voltage line interface circuit

Details Enhanced high voltage line interface circuit Enhanced high voltage line interface circuit

1990-10-18

1992-12-29

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Protective circuit

379399, 379413, 379322, H04M 1900

Patent

active

051757648

ABSTRACT:
An enhanced high voltage line interface circuit for a digital switching system over which a connection is established between a digital switching system and a subscriber instrument via a subscriber loop. The high voltage line interface circuit includes in combination circuits that provide power to the subscriber loop and convert received analog voice signals transmitted from the subscriber instrument into differential voltage voice signals for subsequent conversion to digital data for use by the digital switching system. Additionally, differential voltage voice signals from the digital switching system are converted to analog voice signals for transmission along the subscriber loop to the subscriber instrument. The high voltage line interface circuit further includes circuits that detect and monitor the subscriber loop status and develop digital logic output signals that are used to report the status of the loop to a digital switching system controller.

REFERENCES:
patent: 4275277 (1981-06-01), Ferrieu
patent: 4476350 (1984-10-01), Aull et al.
patent: 4685130 (1987-08-01), Burns
patent: 4852162 (1989-07-01), Taya et al.
patent: 4864609 (1989-09-01), Moisin
patent: 4866767 (1989-09-01), Tanimoto et al.
patent: 4866768 (1989-09-01), Sinberg
patent: 5014305 (1991-05-01), Moisin

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