Communications patching devices having capacitor-based multi-stage near-end alien crosstalk compensation circuits between adjacent connector ports
Communications patching devices include first and second connectors mounted immediately adjacent to each other. The first connector includes a first output terminal and a second output terminal that are connected to respective first and second conductive paths, and the second connector includes a third output terminal and a fourth output terminal that are connected to respective third and fourth conductive paths. The first and second conductive paths form a first differential pair of conductive paths and the first and second output terminals form a first differential pair of output terminals. The third and fourth conductive paths form a second differential pair of conductive paths, and the third and fourth output terminals form a second differential pair of output terminals. The output terminals are arranged such that a first signal coupling level from the first output terminal to the third output terminal in response to a communication signal that is transmitted through the first differential pair of output terminals exceeds a second signal coupling level from the first output terminal to the fourth output terminal in response to the communication signal. A first capacitor is provided between the first conductive path and the fourth conductive path and a second capacitor is provided between at least one of the first conductive path and the third conductive path or between the second conductive path and the fourth conductive path.
1. A communications patching device, comprising:
a mounting frame;
a first communications connector mounted on the mounting frame, the first communications connector including a first output terminal and a second output terminal that are connected to respective first and second conductive paths through the first communications connector, the first and second conductive paths forming a first differential pair of conductive paths through the first communications connector and the first and second output terminals forming a first differential pair of output terminals;
a second communications connector mounted on the mounting frame, the second communications connector including a third output terminal and a fourth output terminal that are connected to respective third and fourth conductive paths through the second communications connector, the third and fourth conductive paths forming a second differential pair of conductive paths through the second communications connector and the third and fourth output terminals forming a second differential pair of output terminals, the second communications connector being mounted immediately adjacent to the first communications connector and arranged such that a first signal coupling level from the first output terminal to the third output terminal in response to a first communication signal that is transmitted through the first differential pair of output terminals exceeds a second signal coupling level from the first output terminal to the fourth output terminal in response to the first communication signal being transmitted through the first differential pair of output terminals;
a first capacitor between the first conductive path and the fourth conductive path; and
a second capacitor between at least one of the first conductive path and the third conductive path or between the second conductive path and the fourth conductive path.
2. The communications patching device of claim 1 , wherein a first delay corresponding to a time it takes the first communication signal to travel from the first differential pair of output terminals to the first capacitor is less than a second delay that corresponds to a time that it takes the first communication signal to travel from the first differential pair of output terminals to the second capacitor.
3. The communications patching device of claim 2 , wherein the first, second, third and fourth output terminals are mounted on a common printed circuit board.
4. The communications patching device of claim 3 , wherein the first, second, third and fourth output terminals comprise insulation displacement contacts.
5. The communications patching device of claim 1 , wherein the first and second capacitors comprises at least part of a multi-stage near-end alien crosstalk compensation circuit that is configured to compensate for near-end alien crosstalk between the first and second differential pairs of conductive paths, wherein the first capacitor comprises at least part of a first stage of the multi-stage near-end alien crosstalk compensation circuit and the second capacitor comprises at least part of a second stage of the multi-stage near-end alien crosstalk compensation circuit, and wherein the polarity of the near-end alien crosstalk compensation introduced in the first stage is generally opposite the polarity of the near-end alien crosstalk compensation introduced in the second stage.
6. The communications patching device of claim 5 , wherein the multi-stage near-end alien crosstalk compensation circuit consists only of capacitive compensation elements.
7. The communications patching device of claim 5 , wherein the multi-stage near-end alien crosstalk compensation circuit increases the far-end alien crosstalk between the first and second differential pairs of conductive paths.
8. The communications patching device of claim 3 , wherein a first electrode of the first capacitor is directly connected to a first metal-plated aperture in the common printed circuit board that receives the first output terminal via a dead-end branch off of the first conductive path, and wherein the second electrode of the first capacitor is directly connected to a second metal-plated aperture in the common printed circuit board that receives the fourth output terminal via a dead-end branch off of the fourth conductive path.
9. The communications patching device of claim 1 , further comprising a third capacitor between the second conductive path and the third conductive path.
10. The communications patching device of claim 1 , wherein the patch panel further comprises a third communications connector that is mounted on the mounting frame adjacent to the second communications connector such that the second communications connector is between the first and third communications connectors, wherein the first and second capacitors comprise at least part of a first multi-stage alien crosstalk compensation circuit that is configured to compensate for alien crosstalk between the first differential pair of output terminals and the second differential pair of output terminals, and wherein the second communications connector further comprises:
a second multi-stage alien crosstalk compensation circuit that is configured to compensate for alien crosstalk between a third differential pair of output terminals on the second communications connector and a fourth differential pair of output terminals on the first communications connector;
a third multi-stage alien crosstalk compensation circuit that is configured to compensate for alien crosstalk between a fifth differential pair of output terminals on the second communications connector and a sixth differential pair of output terminals on the third communications connector; and
a fourth multi-stage alien crosstalk compensation circuit that is configured to compensate for alien crosstalk between a seventh differential pair of output terminals on the second communications connector and an eighth differential pair of output terminals on the third communications connector.
11. The communications patching device of claim 1 , wherein the first capacitor comprises a section of a first conductive trace that is a dead-end branch off of the first conductive path that runs immediately adjacent to a section of a second conductive trace that is a dead-end branch off of the fourth conductive path.