Enhanced data cable with cross-twist cabled core profile

• US 8,729,394 B2
• Filed: 05/05/2003
• Issued: 05/20/2014
• Est. Priority Date: 04/22/1997
• Status: Expired due to Fees

• Current Assignee: Belden Inc.
• Original Assignee: Belden Inc.
• Inventors: Clark, William T., Dellagala, Joseph, MacDonald, Peter D.
• Primary Examiner(s): NGUYEN, CHAU N
• Application Number:
  US10/430,365
• Publication Number:
  US 20110155419A1
• Time in Patent Office: 4,033 Days
• Field of Search: 174/113.C, 174/113.R
• US Class Current: 174/113.R
• CPC Class Codes: H01B 11/06 with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
• CPC Class Codes: H01B 11/08 Screens specially adapted for reducing cross-talk

Abstract

A cable exhibiting reduced crosstalk between transmission media includes a core having a profile with a shape which defines spaces or channels to maintain a spacing between transmission media in a finished cable. The core is formed of a conductive material to further reduce crosstalk. A method of producing a cable introduces a core as described above into the cable assembly and imparts a cable closing twist to the assembly.

Claims

1. An unshielded high speed data communications cable comprising:

a plurality of twisted pairs of conductors;

a non-conductive central core including a plurality of fins having substantially parallel sides extending radially outward from a central region of the non-conductive central core,

wherein at least one fin of the plurality of fins extends to at least an outer boundary defined by an outer dimension of at least one of the twisted pairs of conductors, the plurality of fins defining a corresponding plurality of channels within which the plurality of twisted pairs of conductors are individually disposed, the non-conductive central core being formed of a low dielectric constant polyolefin; and

an outer jacket being formed of a non-conductive material, the outer jacket maintaining the plurality of twisted pairs within the plurality of channels.

2. The unshielded high speed data communications cable of claim 1, wherein said at least one fin is bent at a tip by the outer jacket.

3. The unshielded high speed data communications cable of claim 1, further comprising a binder wrapped around the plurality of twisted pairs and non-conductive central core, the binder together with the outer jacket maintaining the plurality of twisted pairs of conductors within the plurality of channels.

4. The unshielded high speed data communications cable of claim 3, wherein said at least one fin is bent at a tip by the outer jacket and/or the binder.

5. The unshielded high speed data communications cable of claim 3, wherein the binder comprises a dielectric tape.

6. The unshielded high speed data communications cable of claim 5, wherein the dielectric tape is a polyester tape.

7. The unshielded high speed data communications cable of claim 1, wherein the plurality of fins consists of four fins and the plurality of channels consists of four channels that are defined by adjacent pairs of the four fins.

8. The unshielded high speed data communications cable of claim 7, wherein each of the four fins extends radially outward from the central region of the non-conductive core at substantially right angles to at least one other of the four fins.

9. The unshielded high speed data communications cable of claim 1, wherein the plurality of fins position the plurality of twisted pairs in a substantially 90°

relationship.

10. The unshielded high speed data communications cable of claim 1, wherein each fin of the plurality of fins has a rounded tip.

11. The unshielded high speed data communications cable of claim 1, wherein the cable is configured to be Underwriters Laboratories (UL) compliant, and wherein the non-conductive central core comprises at least one of a solid fluoropolymer, and a foamed fluoropolymer.

12. The unshielded high speed data communications cable of claim 11, wherein the outer jacket is formed of polyvinyl chloride.

13. The unshielded high speed data communications cable of claim 1, wherein the non-conductive central core is formed of a solid or foamed flame retardant polyolefin.

14. The unshielded high speed data communications cable of claim 1, wherein the non-conductive central core comprises a central cavity.

15. The unshielded high speed data communications cable of claim 14, further comprising a fiber optic element disposed within the central cavity.

16. The unshielded high speed data communications cable of claim 1, wherein each twisted pair of conductors comprises a metal conductor insulated with fluoroethylene-propylene (FEP).

17. The unshielded high speed data communications cable of claim 1, wherein the at least one fin of the plurality of fins extends beyond the outer boundary defined by the outer dimension of at least one of the twisted pairs of conductors to contact the outer jacket.

18. The unshielded high speed data communications cable of claim 17, wherein the at least one fin of the plurality of fins is bent at a tip by the outer jacket.

19. The unshielded high speed data communications cable of claim 1, wherein the plurality of fins comprises four fins, further comprising:

each of the four fins configured to extend beyond the outer boundary defined by the outer dimension of at least one of the twisted pairs of conductors to contact the outer jacket.

20. The unshielded high speed data communications cable of claim 19, wherein the at each of the four fins is bent at a tip by the outer jacket.

21. The unshielded high speed data communications cable of claim 1, wherein the non-conductive central core is twisted.

22. The unshielded high speed data communications cable of claim 1, wherein the plurality of fins are twisted.

23. The unshielded high speed data communications cable of claim 1, wherein the plurality of twisted pairs of conductors are twisted.

24. The unshielded high speed data communications cable of claim 1, wherein the plurality of twisted pairs, the non-conductive central core, and the plurality of fins are twisted along a longitudinal axis of the unshielded high speed data communications cable to form a closed cable.

25. The unshielded high speed data communications cable of claim 1, further comprising:

transmission media that includes at least one of the plurality of twisted pairs, the non-conductive central core, and the plurality of fins, wherein at least a portion of the transmission media are twisted along a longitudinal axis of the unshielded high speed data communications cable.

26. An unshielded high speed data communications cable comprising:

a plurality of twisted pairs of conductors;

a non-conductive central core including a plurality of fins extending radially outward from a center of the core, at least one fin extending to at least an outer boundary defined by an outer dimension of the twisted pairs of conductors, the plurality of fins defining a plurality of channels within which the plurality of twisted pairs of conductors are individually disposed, the non-conductive central core being formed of a low dielectric constant flame retardant polyolefin;

an outer jacket covering the plurality of twisted pairs of conductors and the non-conductive central core and arranged to maintain the plurality of twisted pairs of conductors in position with respect to the non-conductive central core, the outer jacket being formed of a nonconductive material;

wherein the at least one fin of the non-conductive central core is bent at a tip by the outer jacket; and

wherein the unshielded data cable does not include a shield that encloses any of the plurality of twisted pairs of conductors and the non-conductive central core.

27. The unshielded high speed data communications cable of claim 26, wherein the plurality of fins consists of four fins, each fin extending radially outward from the center of the core at substantially right angles to at least one other of the four fins.

28. The unshielded high speed data communications cable of claim 26, wherein the outer jacket consists of single layer of the non-conductive material.