MULTISTAGE CAPACITIVE CROSSTALK COMPENSATION ARRANGEMENT

• US 20110124239A1
• Filed: 11/23/2010
• Published: 05/26/2011
• Est. Priority Date: 02/12/2008
• Status: Active Grant

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: ADC GmbH (TE Connectivity Ltd. (United Kingdom))
• Inventors: Murray, David Patrick, Hammond, Bernard Harold JR.
• Granted Patent: US 8,100,727 B2
• Time in Patent Office: Days
• US Class Current: 439/676
• CPC Class Codes: H01R 13/6461 Means for preventing cross-talk
• CPC Class Codes: H01R 13/6464 by adding capacitive elements
• CPC Class Codes: H01R 13/6466 on substrates, e.g. printed circuit boards [PCB]
• CPC Class Codes: H01R 13/6658 on printed circuit board H01R13/6666 - H01R13/6691 take precedence
• CPC Class Codes: H01R 13/6691 with built-in signalling means H01R13/717 takes precedence
• CPC Class Codes: H01R 24/64 for high frequency, e.g. RJ 45
• CPC Class Codes: H05K 1/0228 Compensation of cross-talk by a mutually correlated lay-out of printed circuit traces, e.g. for compensation of cross-talk in mounted connectors balanced signal pairs H05K1/0245
• CPC Class Codes: H05K 1/162 incorporating printed capacitors
• CPC Class Codes: H05K 2201/09236 Parallel layout layout of balanced signal pairs H05K1/0245; superposed layout H05K2201/09672
• CPC Class Codes: H05K 2201/09672 Superposed layout, i.e. in different planes parallel traces in one plane H05K2201/09236
• CPC Class Codes: H05K 2201/10189 Non-printed connector
• CPC Class Codes: Y10S 439/941 Crosstalk suppression
• CPC Class Codes: Y10T 29/49204 Contact or terminal manufacturing
• CPC Class Codes: Y10T 29/49208 by assembling plural parts
• CPC Class Codes: Y10T 29/53209 Terminal or connector

Abstract

Methods and systems for providing crosstalk compensation in a jack are disclosed. According to one method, the crosstalk compensation is adapted to compensate for undesired crosstalk generated at a capacitive coupling located at a plug inserted within the jack. The method includes positioning a first capacitive coupling a first time delay away from the capacitive coupling of the plug, the first capacitive coupling having a greater magnitude and an opposite polarity as compared to the capacitive coupling of the plug. The method also includes positioning a second capacitive coupling at a second time delay from the first capacitive coupling, the second time delay corresponding to an average time delay that optimizes near end crosstalk. The second capacitive coupling has generally the same overall magnitude but an opposite polarity as compared to the first capacitive coupling, and includes two capacitive elements spaced at different time delays from the first capacitive coupling.

Claims

1. A method for providing crosstalk compensation in a jack, the crosstalk compensation being adapted to compensate for undesired crosstalk generated at a capacitive coupling located at a plug inserted within the jack, the method comprising:

positioning a first capacitive coupling between first and second wire pairs of the jack at a first time delay away from the capacitive coupling of the plug;

positioning a second capacitive coupling including at least first and second capacitive elements between the first and second wire pairs at a second time delay from the first capacitive coupling, wherein the second time delay corresponding to an average time delay that optimizes near end crosstalk, and wherein different time delays of the first and second capacitive elements in the second capacitive coupling are centered about the average time delay to optimize near end crosstalk and are spaced apart to compensate for far end crosstalk.

2. The method of claim 1, wherein the first capacitive coupling has a greater magnitude and an opposite polarity as compared to the capacitive coupling of the plug.

3. The method of claim 2, wherein the second capacitive coupling has generally the same overall magnitude but an opposite polarity to the first capacitive coupling.

4. The method of claim 1, further comprising providing a third capacitive coupling positioned a third time delay away from the second capacitive coupling, such that the third time delay is approximately the same as the first time delay.

5. The method of claim 4, wherein the third capacitive coupling has approximately the same overall magnitude but an opposite polarity to the capacitive coupling located at the plug inserted within the jack.

6. The method of claim 1, wherein the first capacitive coupling includes at least two capacitive elements, wherein the at least two capacitive elements of the first capacitive coupling vary in magnitude, thereby reducing alien crosstalk generated by the plug and jack.

7. The method of claim 1, wherein the first and second wire pairs comprise the 3-6 and 4-5 wire pairs within an RJ-45 jack.

8. The method of claim 1, wherein the first and second capacitive elements in the second capacitive coupling have differing magnitudes.

9. A telecommunications jack for use in a twisted pair system, the jack comprising:

a plurality of contact springs adapted to make electrical contact with a plug when the plug is inserted into the jack;

a plurality of wire termination contacts for terminating wires to the jack;

a crosstalk compensation arrangement that provides crosstalk compensation between elected tracks extending between the contact springs and the wire termination contacts, the crosstalk compensation arrangement including a first zone of compensation a first time delay away from the capacitive coupling of the plug and a second zone of compensation at a second time delay from the first zone of compensation, the second zone of compensation including two capacitive elements spaced at different time delays from the first zone of compensation to optimize far end crosstalk and having an average time delay that optimizes near end crosstalk.

10. The telecommunications jack of claim 9, further comprising a third capacitive coupling positioned a third time delay away from the second capacitive coupling, such that the third time delay is approximately the same as the first time delay.

11. The telecommunications jack of claim 10, wherein the third capacitive coupling has approximately the same overall magnitude but an opposite polarity to the capacitive coupling located at the plug inserted within the jack.

12. The telecommunications jack of claim 9, wherein the first capacitive coupling includes at least two capacitive elements, wherein the at least two capacitive elements of the first capacitive coupling vary in magnitude, thereby reducing alien crosstalk generated by the plug and jack.

13. The telecommunications jack of claim 9, wherein the first zone of compensation has a greater magnitude and an opposite polarity as compared to the capacitive coupling of the plug, and the second zone of compensation has generally the same overall magnitude but an opposite polarity as compared to the first zone of compensation.

14. The telecommunications jack of claim 9, wherein the second zone of compensation is positioned such that the second time delay is greater than the first time delay.

15. The telecommunications jack of claim 9, wherein the first and second zones of compensation are placed across the 3-6 and 4-5 wire pairs within the jack.

16. A method for providing crosstalk compensation in a jack, the crosstalk compensation being adapted to compensate for undesired crosstalk generated at a capacitive coupling located at a plug inserted within the jack, the method comprising:

positioning a first capacitive coupling between first and second wire pairs of the jack at a first time delay away from the capacitive coupling of the plug, the first capacitive coupling including at least two capacitive elements, wherein the at least two capacitive elements of the first capacitive coupling vary in magnitude, thereby reducing alien crosstalk generated by the plug and jack;

positioning a second capacitive coupling including at least first and second capacitive elements between the first and second wire pairs at a second time delay from the first capacitive coupling, the second time delay corresponding to an average time delay that optimizes near end crosstalk; and

positioning a third capacitive coupling a third time delay away from the second capacitive coupling, such that the third time delay is approximately the same as the first time delay.

17. The method of claim 16, wherein different time delays of the first and second capacitive elements in the second capacitive coupling are centered about the average time delay to optimize near end crosstalk and are spaced apart to compensate for far end crosstalk

18. The method of claim 16, wherein the first and second zones of compensation are placed across the 3-6 and 4-5 wire pairs within the jack.

19. A telecommunications jack for use in a twisted pair system, the jack comprising:

a plurality of contact springs adapted to make electrical contact with a plug when the plug is inserted into the jack;

a plurality of wire termination contacts for terminating wires to the jack;

a crosstalk compensation arrangement that provides crosstalk compensation between elected tracks extending between the contact springs and the wire termination contacts, the crosstalk compensation arrangement including a first zone of compensation a first time delay away from the capacitive coupling of the plug and a second zone of compensation at a second time delay from the first zone of compensation, the second zone of compensation having an average time delay that optimizes near end crosstalk.

20. The telecommunications jack of claim 19, wherein the second zone of compensation includes two capacitive elements spaced at different time delays from the first zone of compensation to optimize far end crosstalk.