TWISTED PAIR CABLE HAVING IMPROVED CROSSTALK ISOLATION

• US 20070163800A1
• Filed: 12/08/2006
• Published: 07/19/2007
• Est. Priority Date: 12/09/2005
• Status: Active Grant

• Current Assignee: Belden Technologies, LLC (Belden Inc.)
• Original Assignee: Belden Technologies, LLC (Belden Inc.)
• Inventors: ALLEN, ROBERT, RUBERA, MICHAEL, CLARK, WILLIAM, DELLAGALA, JOSEPH
• Granted Patent: US 7,449,638 B2
• Time in Patent Office: Days
• US Class Current: 174/113.C
• CPC Class Codes: H01B 11/04 with pairs or quads mutually positioned to reduce cross-talk
• CPC Class Codes: H01B 11/06 with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens

Abstract

A cable that provides reduced alien crosstalk between similar twisted pairs in cables that are in close proximity to one another and/or crosstalk between twisted pairs of the cable. In one example, a cable includes a first twisted pair of insulated conductors, a second twisted pair of insulated conductors, a shaped separator positioned so as to separate the first twisted pair from the second twisted pair, and a jacket disposed about the first and second twisted pairs and the separator, wherein the shaped separator comprises a central arm and at least one enlarged portion disposed at a first end of the central arm.

Claims

1. A cable comprising:

a first twisted pair of insulated conductors;

a second twisted pair of insulated conductors;

a separator positioned so as to separate the first twisted pair from the second twisted pair; and

a jacket disposed about the first and second twisted pairs and the separator;

wherein the separator comprises a central arm and at least one enlarged portion positioned at one end of the central arm and positioned at least partially around the first twisted pair of insulated conductors so as to create an outward projection of the jacket.

2. The cable of claim 1, wherein the first and second twisted pair of insulated conductors and the separator comprise a core of the cable, wherein the jacket is provided with a plurality of protrusions extending away from an inner circumferential surface of the jacket, and wherein the plurality of protrusions are configured to cause the core to be kept away from the inner circumferential surface of the jacket.

3. The cable of claim 1, further comprising a third twisted pair of insulated conductors and a fourth twisted pair of insulated conductors, wherein the separator separates the first and third twisted pairs from the second and fourth twisted pairs, wherein the first twisted pair has a shortest twist lay of the first, second, third and fourth twist pairs, and wherein the at least one enlarged portion is disposed at least partially around the first twisted pair of insulated conductors.

4. The cable of claim 3, wherein at least one enlarged portion wraps around the first twisted pair of insulated conductors such that a line drawn from a center of the central arm of the separator and through a center of the first twisted pair of conductors substantially bisects the enlarged portion.

5. The cable of claim 1, wherein at least one enlarged portion has an oblong shape.

6. The cable of claim 1, wherein the separator further comprises a second arm coupled to the central arm.

7. The cable of claim 6, further comprising a third twisted pair of insulated conductors and a fourth twisted pair of insulated conductors, and wherein the second arm is constructed to separate the third twisted pair from the first twisted pair and the fourth twisted pair from the second twisted pair.

8. The cable of claim 1, further comprising a third twisted pair of insulated conductors and a fourth twisted pair of insulated conductors, wherein the separator separates the first and third twisted pairs from the second and fourth twisted pairs, wherein the first twisted pair, the second twisted pair, the third twisted pair, the fourth twist pair and the separator make up a core of the cable, and wherein the core is helically wrapped with a dielectric rod.

9. The cable of claim 8, wherein the dielectric rod is wrapped about the core in a same direction that the cable is twisted.

10. The cable of claim 8, wherein the dielectric rod is wrapped about the core in an opposite direction than that which the cable is twisted.

11. The cable of claim 1, further comprising a third twisted pair of insulated conductors and a fourth twisted pair of insulated conductors, wherein the separator separates the first and third twisted pairs from the second and fourth twisted pairs, wherein the first twisted pair, the second twisted pair, the third twisted pair, the fourth twist pair and the separator make up a core of the cable, and wherein the core is oscillated about the center of the cable within the jacket.

12. The cable of claim 11, wherein the core is oscillated in a same direction as the cable is twisted.

13. The cable of claim 1, further comprising a third twisted pair of insulated conductors and a fourth twisted pair of insulated conductors, wherein the separator separates the first and third twisted pairs from the second and fourth twisted pairs, wherein the first twisted pair, the second twisted pair, the third twisted pair, the fourth twist pair and the separator make up a core of the cable, and wherein the jacket is extruded along the length of the cable with substantially the same thickness and with varying tightness of the jacket to the core of the cable.

14. The cable of claim 13, wherein a frequency of the varying degrees of thickness of the cables is random.

15. A cable comprising:

a first twisted pair of insulated conductors;

a second twisted pair of insulated conductors;

a separator positioned so as to separate the first twisted pair from the second twisted pair; and

a jacket disposed about the first and second twisted pairs and the separator;

wherein the separator comprises a central arm and substantially symmetrical enlarged portions positioned at opposing ends of the central arm.

16. The cable of claim 15, wherein the separator comprises a first rounded enlarged portion formed at a first end of the central arm and a second rounded enlarged portion formed at a second, opposite end of the central arm;

and wherein the first and second rounded enlarged portions are substantially similarly sized and substantially equidistant from a center of the central arm.

17. The cable of claim 15, wherein the separator further comprises a second arm coupled to the central arm.

18. The cable of claim 17, further comprising a third twisted pair of insulated conductors and a fourth twisted pair of insulated conductors, and wherein the second arm is constructed to separate the third twisted pair from the first twisted pair and the fourth twisted pair from the second twisted pair.

19. The cable of claim 15, wherein the first and second twisted pair of insulated conductors and the separator comprise a core of the cable, wherein the jacket is provided with a plurality of protrusions extending away from an inner circumferential surface of the jacket, and wherein the plurality of protrusions are configured to cause the core to be kept away from the inner circumferential surface of the jacket.

20. A data cable comprising:

a plurality of twisted pairs of insulated conductors including a first twisted pair, a second twisted pair and a third twisted pair;

a shaped filler including a body portion and a plurality of tines extending outward from the body portion, the plurality of tines defining a plurality of channels in which the plurality of twisted pairs of insulated conductors are individually disposed; and

an outer jacket surrounding the plurality of twisted pairs of insulated conductors and the shaped filler along a length of the cable; and

wherein the shaped filler is constructed such that the body portion provides a first spacing between the first twisted pair and the second twisted pair and one of the plurality of tines provides a second spacing between the second twisted pair and the third twisted pair, with the filler configured such that the second spacing is substantially smaller than the first spacing.

21. The data cable of claim 20, wherein the body portion is constructed so as to provide a helical circumferential barrier extending along a length of the cable to facilitate reduction of alien crosstalk.

22. The data cable of claim 20, wherein the body portion of the shaped filler has an oblong shape.

23. The data cable of claim 20, wherein the first and second twisted pairs of conductors have the most similar twist lay lengths of the first, second, and third twisted pairs of conductors.

24. The data cable of claim 20, wherein the tines of the shaped filler extend beyond an outer circumference of the first, second and third twisted pairs of conductors.

25. The data cable of claim 24, wherein the tines include a flange portion that creates an opening for each channel that is narrower than a diameter of the twisted pairs of conductors.

26. The data cable of claim 20, wherein the shaped filler comprises a channel.

27. The cable of claim 20, wherein the first, second and third twisted pair of insulated conductors and the shaped filler comprise a core of the cable, wherein the outer jacket is provided with a plurality of protrusions extending away from an inner circumferential surface of the jacket, and wherein the plurality of protrusions are configured to cause the core to be kept away from the inner circumferential surface of the jacket.