Subscriber line interface and power circuit

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

H - Electricity

04

M

H04M 7/00 (2006.01) H04M 3/00 (2006.01) H04M 3/02 (2006.01) H04M 3/22 (2006.01) H04M 19/00 (2006.01) H04M 19/02 (2006.01)

Patent

CA 2172563

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 sectionthat 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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