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AssigneeLucent Technologies Inc.
InventorsLuc Walter Adriaenssens, Amid Ihsan Hashim, Wayne David Larsen, Bryan Scott Moffitt, Julian Robert Pharney
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An electrical connector 60 achieves improved transmission performance by introducing predetermined amounts of compensation between two pairs of conductors that extend from its input terminals to its output terminals along interconnection paths. Electrical signals on one pair of conductors are coupled onto the other pair of conductors in two or more compensation stages that are time delayed with respect to each other. Illustratively, the electrical connector is a modular jack that is adapted to receive a modular plug 20. Associated with the modular plug and the input of the modular jack there exists a known amount of offending crosstalk A.sub.0, which is approximately canceled by the two or more stages of compensating crosstalk. In a first stage, compensating crosstalk A.sub.1 is introduced between the pairs, and it has a first predetermined magnitude and phase at a given frequency. In a second stage, compensating crosstalk A.sub.2 is introduced between the pairs, and it has a second predetermined magnitude and phase at the given frequency. Multiple compensation stages are needed because, at high frequencies, compensating crosstalk cannot be introduced that is exactly 180 degrees out of phase with the offending crosstalk because of propagation delay. The electrical connector 60 is constructed using a multi-layer printed wiring board 600 having input and output terminals where connection to metallic wires is made. These terminals are interconnected on the printed wiring board by metallic paths that are arranged to provide multiple stages of compensating crosstalk. When the connector 60 is joined to a plug 20, the near-end crosstalk of the combined structure is extremely low at frequencies up to at least 200 MHz.
An electrical connector for providing predetermined amounts of compensating signals to approximately cancel a like amount of an offending signal at a given frequency, the connector including first and second pairs of metallic conductors that are adjacent to each other and form an interconnection path between input and output terminals, the connector further including a first compensation stage that is positioned at a first effective location along the interconnection path, wherein compensating signals having a first magnitude and polarity are coupled between the pairs;
A communication jack assembly comprising:
An electrical connector having at least two pairs of conductors that extend alone a metallic interconnection path between input and output terminals, said connector including at least three effective locations along the interconnection path where signal energy is coupled between the pairs of conductors, at one or more given frequencies the signal energy at each effective location has a predetermined magnitude and phase relative to the other effective locations such that near-end crosstalk is approximately canceled, wherein said one or more given frequencies is in the range 50-400 MHz.
A low-crosstalk electrical connector system comprising a jack mounted on a printed wiring board at an input-terminal region of the board, offending crosstalk being present at the input-terminal region when electrical signals are present, said offending crosstalk comprising unwanted signal coupling between pairs of conductors at the input-terminal region having a known magnitude and phase at a given frequency;
A method for reducing a known amount of offending crosstalk at a given frequency, said crosstalk existing between first and second pairs of conductors at an input-terminal region of an electrical connector, the first pair being adjacent to the second pair, the method comprising the steps of:
Dependencies are inferred from the claim text.