DATA CABLE WITH CROSS-TWIST CABLED CORE PROFILE

• US 20070193769A1
• Filed: 02/09/2007
• Published: 08/23/2007
• Est. Priority Date: 04/22/1997
• Status: Active Grant

• Current Assignee: Belden Technologies, LLC (Belden Inc.)
• Original Assignee: Belden Technologies, LLC (Belden Inc.)
• Inventors: Gareis, Galen, Clark, William
• Granted Patent: US 7,405,360 B2
• Time in Patent Office: Days
• US Class Current: 174/113.00R
• CPC Class Codes: H01B 11/06 with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens

Abstract

Cables including a plurality of twisted pairs of insulated conductors and a jacket surrounding the plurality of twisted pairs of insulated conductors, the jacket including a plurality of protrusions extending away from an inner circumferential surface of the jacket toward a center of the cable. The plurality of protrusions are configured so as to hold the plurality of twisted pairs away from the inner circumferential surface of the jacket, and may provide an air gap between the plurality of twisted pairs of insulated conductors and the inner circumferential surface of the jacket, thereby reducing susceptibility of the plurality of twisted pairs to alien near end crosstalk.

Claims

1. A cable for data transmission, the cable comprising:

a plurality of twisted pairs of insulated conductors including a first twisted pair and a second twisted pair, each twisted pair comprising two insulated conductors twisted together in a helical manner;

a binder substantially surrounding the plurality of twisted pairs of insulated conductors;

a jacket surrounding the plurality of twisted pairs of insulated conductors and the binder; and

an element disposed between the binder and the jacket along a length of the cable, the element providing an air gap between the jacket and the binder.

2. The cable as claimed in claim 1, wherein the element comprises a dielectric helixed spline.

3. The cable as claimed in claim 2, wherein the dielectric helixed spline comprises a fluoropolymer.

4. The cable as claimed in claim 1, wherein the element comprises a plurality of dielectric helixed splines positioned about a circumference of the binder.

5. The cable as claimed in claim 1, further comprising a separator disposed among the plurality of twisted pairs of insulated conductors so as to separate at least one the plurality of twisted pairs from others of the plurality of twisted pairs.

6. The cable as claimed in claim 1, wherein the element is helically wrapped around the binder along the length of the cable.

7. The cable as claimed in claim 1, wherein the element is a conductive rod.

8. A cable for data transmission, the cable comprising:

a plurality of twisted pairs of insulated conductors including a first twisted pair and a second twisted pair, each twisted pair comprising two insulated conductors helically twisted together;

a separator disposed among the plurality of twisted pairs of insulated conductors so as to separate at least one the plurality of twisted pairs from others of the plurality of twisted pairs; and

a jacket surrounding the plurality of twisted pairs and the separator, the jacket comprising a dual-layer structure including a first jacket layer and a second jacket layer;

wherein the jacket comprises a plurality of inwardly-projecting protrusions that extend away from an inner circumferential surface of at least one of the first jacket layer and the second jacket layer toward the plurality of twisted pairs of insulated conductors.

9. The cable as claimed in claim 8, wherein the plurality of protrusions extend away from the inner circumferential surface of the first jacket layer.

10. The cable as claimed in claim 9, further comprising a conductive shield disposed between the first jacket layer and the second jacket layer.

11. The cable as claimed in claim 9, wherein the first jacket layer comprises a first material having a first effective dielectric constant and the second jacket layer comprises a second material having a second effective dielectric constant;

and wherein the first effective dielectric constant is lower than the second effective dielectric constant.

12. The cable as claimed in claim 9, wherein the first jacket layer comprises a first material having a first dissipation factor and the second jacket layer comprises a second material having a second dissipation factor;

and wherein the first dissipation factor is lower than the second dissipation factor.

13. The cable as claimed in claim 9, further comprising a dielectric element disposed between the first jacket layer and the second jacket layer to create an air gap between the first and second jacket layers.

14. The cable as claimed in claim 13, wherein the dielectric element comprises a helixed spline.

15. The cable as claimed in claim 9, wherein the first jacket layer is bonded to the second jacket layer.

16. The cable as claimed in claim 8, wherein the plurality of protrusions extend away from the inner circumferential surface of the second jacket layer to create an air gap between the first and second jacket layers.

17. The cable as claimed in claim 16, wherein the first jacket layer comprises a first material and the second jacket layer comprises a second;

and wherein at least one of an effective dielectric and a dissipation factor is lower for the first material than for the second material.

18. The cable as claimed in claim 16, wherein the first jacket layer comprises a foamed material.

19. The cable as claimed in claim 8, wherein the plurality of inwardly-projecting protrusions includes at least a first inwardly-projecting protrusion and a second inwardly-projecting protrusion;

and wherein the first inwardly-projecting protrusion has a first height and the second inwardly-projecting protrusion has a second height that is substantially larger than the first height.

20. The cable as claimed in claim 8, wherein the plurality of inwardly-projecting protrusions includes at least a first inwardly-projecting protrusion and a second inwardly-projecting protrusion;

and wherein the first inwardly-projecting protrusion has a first width and the second inwardly-projecting protrusion has a second width that is substantially larger than the first width.

21. The cable as claimed in claim 8, wherein the plurality of twisted pairs of insulated conductors and the jacket are helically twisted together with a cable twist lay that is within a range of about 2 to 6 inches.

23. The cable as claimed in claim 8, wherein the jacket has a substantially circular cross-sectional shape.

24. The cable as claimed in claim 8, wherein the plurality of inwardly-projecting protrusions extend away from the inner circumferential surface of the inner jacket layer and are configured so as to hold the plurality of twisted pairs away from the inner circumferential surface of the jacket, thereby reducing susceptibility of the plurality of twisted pairs to alien near end crosstalk.

25. The cable as claimed in claim 8, wherein the plurality of inwardly-projecting protrusions extend away from the inner circumferential surface of the inner jacket layer and are configured so as to keep the plurality of twisted pairs away from the inner circumferential surface of the jacket, thereby reducing attenuation of data signals traveling along at least one of the plurality of twisted pairs.

26. A bundled cable comprising:

a plurality of individual cables for data transmission, wherein at least one of the individual cables for data transmission is the cable as claimed in claim 8.

27. The cable as claimed in claim 26, further comprising a conductive shield substantially surrounding the plurality of twisted pairs of insulated conductors and the helixed spline;

wherein the conductive layer is in contact with the conductive shield at least at some points along a length of the cable.

22. The cable as claimed in claim 8, wherein the plurality of twisted pairs includes four twisted pairs of insulated conductors.

22-1. A cable for data transmission, the cable comprising:

a plurality of twisted pairs of insulated conductors including a first twisted pair and a second twisted pair, each twisted pair comprising two insulated conductors helically twisted together;

a helixed spline comprising a plurality of fins extending outwardly from a central connection point to create a plurality of channels, each channel being defined by a pair of fins, the helixed spline having a substantially dielectric body, and the fins each having a base connected to the central connection point and a tip; and

a conductive layer disposed on the tips of the fins;

wherein the twisted pairs of insulated conductors are disposed at least partially within the plurality of channels.