Subscriber line interface and power circuit

Details Subscriber line interface and power circuit Subscriber line interface and power circuit

1995-05-26

1998-12-08

Tsang, Fan S.

Telephonic communications

Subscriber line or transmission line interface

379350, 379373, 379377, H04M 174

Patent

active

058481494

ABSTRACT:
A subscriber line circuit which truly implements all of the BORSCHT functions and which does not rely on an external ringing generator to provide the ringing voltage when needed is disclosed. This implementation is achieved by recognizing that supervisory and ringing signals occur in some sort of sequence and, therefore, do not have to be generated simultaneously. Based on this recognition, we provide a circuit which truly implements all of the BORSCHT functions and includes a power section that generates each of the supervisory signals, e.g., -48 volts and -24 volts, and alerting signal, e.g., ringing signal, in turn and as required.

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