Pulse or digital communications – Cable systems and components – Transformer coupling
Reexamination Certificate
2007-06-26
2008-10-07
Lugo, David B (Department: 2611)
Pulse or digital communications
Cable systems and components
Transformer coupling
Reexamination Certificate
active
07433412
ABSTRACT:
A digital subscriber line (DSL) circuit is disclosed and includes at least one transformer exciting network (TEN) adapted to supply a low-impedance path to ground in response to an excitation current. The excitation current has a non-DSL frequency, and the low-impedance path to ground allows the excitation current to flow through a DSL induction neutralizing transformer (INT). The DSL INT is electrically coupled to the at least one TEN. The DSL INT is adapted to add longitudinal inductance to a telecommunication line in response to the excitation current, wherein the longitudinal inductance suppresses induced harmonic currents.
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AT&T Intellectual Property L.; L.P.
Lugo David B
Toler Law Group
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