Loading patent…
OwnerFerdinando Lari, Daniele Devecchi +1inventors
InventorsFerdinando Lari, Daniele Devecchi, Emanuela Vizzi
Estimating the term…
A line interface for combining a broad-band XDSL signal and a voice-band telephone signal in a copper duplex cable, where the voice-band signal, over and above the voice signal, carries a DC feed for the user telephone and, during the call phase, also a ring signal. The XDSL signal and the voice signal are coupled to at least one primary winding of a line transformer of which the secondary winding pilots the telephone duplex cable. The secondary winding is not DC-coupled with the duplex cable and the ring and feed signals are injected into the duplex cable by a circuit realized in high-voltage technology and arranged in parallel with the secondary winding. A further inductive winding performs the function of compensating the flow variations induced in the core of the line transformer during the call phase.
A line interface for combining a broad-band XDSL signal and a voice-band telephone signal in a twisted-pair copper line, where the voice-band signal, over and above the voice signal, carries a DC feed for the user telephone and, during the call phase, also a ring signal, the XDSL signal and the voice signal being coupled to at least one primary winding of a line transformer of which at least one secondary winding pilots the twisted-pair telephone line, characterized in that said secondary winding is DC decoupled from said telephone line and the ring signals and the feed signals are injected into said line by a circuit arranged in parallel with said secondary winding.
An interface for driving an XDSL signal and a telephone signal onto a twisted pair, the interface comprising:
An interface for driving an XDSL signal and a telephone signal onto a twisted pair, the interface comprising:
A method, comprising:
Dependencies are inferred from the claim text.