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1.发明专利
公开(公告)号：JP2003199129A
公开(公告)日：2003-07-11
申请号：JP2002338803
申请日：2002-11-22
Applicant: ST MICROELECTRONICS SRL
Inventor： LARI FERDINANDO , DEVECCHI DANIELE , VIZZI EMANUELA
Abstract: PROBLEM TO BE SOLVED: To provide a line interface (30) operated at a low feed voltage that couples a broadband XDSL signal and a voice band telephone signal on a twisted-pair copper line. SOLUTION: In the line interface (30) where the voice-band signal carries a DC feed for a user telephone and also a voice signal, a ring signal, the XDSL signal, and the voice signal are coupled to at least one primary winding of a line transformer, and at least a secondary winding (40) pilots a twisted-pair telephone line (41), the secondary winding (40) is DC-coupled with the line (41) and the ring and feed signals are injected into the telephone line (41) by a circuit (43) arranged in parallel with the secondary winding (40). COPYRIGHT: (C)2003,JPO
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公开(公告)号：DE60123641D1
公开(公告)日：2006-11-16
申请号：DE60123641
申请日：2001-12-10
Applicant: ST MICROELECTRONICS SRL
Inventor： LARI FERDINANDO , DEVECCHI DANIELE , VIZZI EMANUELA
Abstract: A line interface (30) 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 (40) pilots the telephone duplex cable (41). The secondary winding (40) is not DC-coupled with the duplex cable (41) and the ring and feed signals are injected into the duplex cable (41) by a circuit (43) realized in high-voltage technology and arranged in parallel with the secondary winding (40). A further inductive winding (45) performs the function of compensating the flow variations induced in the core (44) of the line transformer during the call phase.
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